mirror of
https://github.com/mongodb/mongo.git
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671 lines
25 KiB
C++
671 lines
25 KiB
C++
// s/commands_admin.cpp
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* TODO
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_ concurrency control.
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_ limit() works right?
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_ KillCursors
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later
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_ secondary indexes
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*/
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#include "stdafx.h"
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#include "../util/message.h"
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#include "../db/dbmessage.h"
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#include "../client/connpool.h"
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#include "../db/commands.h"
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#include "config.h"
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#include "chunk.h"
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#include "strategy.h"
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namespace mongo {
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extern string ourHostname;
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namespace dbgrid_cmds {
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set<string> dbgridCommands;
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class GridAdminCmd : public Command {
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public:
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GridAdminCmd( const char * n ) : Command( n ){
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dbgridCommands.insert( n );
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}
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virtual bool slaveOk(){
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return true;
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}
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virtual bool adminOnly() {
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return true;
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}
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};
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// --------------- misc commands ----------------------
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class NetStatCmd : public GridAdminCmd {
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public:
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NetStatCmd() : GridAdminCmd("netstat") { }
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virtual void help( stringstream& help ) const {
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help << " shows status/reachability of servers in the cluster";
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}
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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result.append("configserver", configServer.getPrimary() );
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result.append("isdbgrid", 1);
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return true;
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}
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} netstat;
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class ListGridCommands : public GridAdminCmd {
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public:
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ListGridCommands() : GridAdminCmd("gridcommands") { }
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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BSONObjBuilder arr;
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int num=0;
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for ( set<string>::iterator i = dbgridCommands.begin(); i != dbgridCommands.end(); i++ ){
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string s = BSONObjBuilder::numStr( num++ );
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arr.append( s.c_str() , *i );
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}
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result.appendArray( "commands" , arr.done() );
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result.append("ok" , 1 );
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return true;
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}
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} listGridCommands;
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// ------------ database level commands -------------
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class ListDatabaseCommand : public GridAdminCmd {
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public:
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ListDatabaseCommand() : GridAdminCmd("listdatabases") { }
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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ScopedDbConnection conn( configServer.getPrimary() );
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auto_ptr<DBClientCursor> cursor = conn->query( "config.databases" , BSONObj() );
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BSONObjBuilder list;
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int num = 0;
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while ( cursor->more() ){
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string s = BSONObjBuilder::numStr( num++ );
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BSONObj o = cursor->next();
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list.append( s.c_str() , o["name"].valuestrsafe() );
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}
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result.appendArray("databases" , list.obj() );
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conn.done();
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return true;
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}
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} gridListDatabase;
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class MoveDatabasePrimaryCommand : public GridAdminCmd {
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public:
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MoveDatabasePrimaryCommand() : GridAdminCmd("moveprimary") { }
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virtual void help( stringstream& help ) const {
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help << " example: { moveprimary : 'foo' , to : 'localhost:9999' } TODO: locking? ";
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}
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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string dbname = cmdObj["moveprimary"].valuestrsafe();
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if ( dbname.size() == 0 ){
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errmsg = "no db";
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return false;
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}
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if ( dbname == "config" ){
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errmsg = "can't move config db";
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return false;
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}
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DBConfig * config = grid.getDBConfig( dbname , false );
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if ( ! config ){
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errmsg = "can't find db!";
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return false;
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}
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string to = cmdObj["to"].valuestrsafe();
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if ( ! to.size() ){
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errmsg = "you have to specify where you want to move it";
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return false;
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}
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if ( to == config->getPrimary() ){
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errmsg = "thats already the primary";
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return false;
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}
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if ( ! grid.knowAboutShard( to ) ){
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errmsg = "that server isn't known to me";
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return false;
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}
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ScopedDbConnection conn( configServer.getPrimary() );
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log() << "moving " << dbname << " primary from: " << config->getPrimary() << " to: " << to << endl;
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// TODO LOCKING: this is not safe with multiple mongos
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ScopedDbConnection toconn( to );
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// TODO AARON - we need a clone command which replays operations from clone start to now
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// using a seperate smaller oplog
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BSONObj cloneRes;
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bool worked = toconn->runCommand( dbname.c_str() , BSON( "clone" << config->getPrimary() ) , cloneRes );
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toconn.done();
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if ( ! worked ){
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log() << "clone failed" << cloneRes << endl;
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errmsg = "clone failed";
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conn.done();
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return false;
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}
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ScopedDbConnection fromconn( config->getPrimary() );
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config->setPrimary( to );
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config->save( true );
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log() << " dropping " << dbname << " from old" << endl;
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fromconn->dropDatabase( dbname.c_str() );
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fromconn.done();
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result << "ok" << 1;
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result << "primary" << to;
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conn.done();
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return true;
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}
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} movePrimary;
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class EnableShardingCmd : public GridAdminCmd {
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public:
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EnableShardingCmd() : GridAdminCmd( "enablesharding" ){}
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virtual void help( stringstream& help ) const {
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help
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<< "Enable sharding for a db. (Use 'shardcollection' command afterwards.)\n"
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<< " { enablesharding : \"<dbname>\" }\n";
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}
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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string dbname = cmdObj["enablesharding"].valuestrsafe();
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if ( dbname.size() == 0 ){
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errmsg = "no db";
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return false;
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}
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DBConfig * config = grid.getDBConfig( dbname );
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if ( config->isShardingEnabled() ){
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errmsg = "already enabled";
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return false;
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}
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config->enableSharding();
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config->save( true );
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result << "ok" << 1;
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return true;
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}
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} enableShardingCmd;
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// ------------ collection level commands -------------
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class ShardCollectionCmd : public GridAdminCmd {
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public:
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ShardCollectionCmd() : GridAdminCmd( "shardcollection" ){}
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virtual void help( stringstream& help ) const {
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help
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<< "Shard a collection. Requires key. Optional unique. Sharding must already be enabled for the database.\n"
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<< " { enablesharding : \"<dbname>\" }\n";
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}
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bool run(const char *cmdns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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string ns = cmdObj["shardcollection"].valuestrsafe();
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if ( ns.size() == 0 ){
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errmsg = "no ns";
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return false;
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}
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DBConfig * config = grid.getDBConfig( ns );
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if ( ! config->isShardingEnabled() ){
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errmsg = "sharding not enabled for db";
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return false;
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}
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if ( config->isSharded( ns ) ){
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errmsg = "already sharded";
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return false;
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}
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BSONObj key = cmdObj.getObjectField( "key" );
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if ( key.isEmpty() ){
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errmsg = "no shard key";
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return false;
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}
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if ( ns.find( ".system." ) != string::npos ){
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errmsg = "can't shard system namespaces";
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return false;
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}
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{
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ScopedDbConnection conn( config->getPrimary() );
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BSONObjBuilder b;
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b.append( "ns" , ns );
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b.appendBool( "unique" , true );
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if ( conn->count( config->getName() + ".system.indexes" , b.obj() ) ){
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errmsg = "can't shard collection with unique indexes";
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conn.done();
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return false;
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}
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BSONObj res = conn->findOne( config->getName() + ".system.namespaces" , BSON( "name" << ns ) );
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if ( res["options"].type() == Object && res["options"].embeddedObject()["capped"].trueValue() ){
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errmsg = "can't shard capped collection";
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conn.done();
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return false;
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}
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conn.done();
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}
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config->shardCollection( ns , key , cmdObj["unique"].trueValue() );
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config->save( true );
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result << "collectionsharded" << ns;
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result << "ok" << 1;
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return true;
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}
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} shardCollectionCmd;
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class SplitCollectionHelper : public GridAdminCmd {
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public:
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SplitCollectionHelper( const char * name ) : GridAdminCmd( name ) , _name( name ){}
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virtual void help( stringstream& help ) const {
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help
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<< " example: { shard : 'alleyinsider.blog.posts' , find : { ts : 1 } } - split the shard that contains give key \n"
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<< " example: { shard : 'alleyinsider.blog.posts' , middle : { ts : 1 } } - split the shard that contains the key with this as the middle \n"
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<< " NOTE: this does not move move the chunks, it merely creates a logical seperation \n"
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;
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}
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virtual bool _split( BSONObjBuilder& result , string&errmsg , const string& ns , ChunkManager * manager , Chunk& old , BSONObj middle ) = 0;
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bool run(const char *cmdns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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string ns = cmdObj[_name.c_str()].valuestrsafe();
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if ( ns.size() == 0 ){
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errmsg = "no ns";
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return false;
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}
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DBConfig * config = grid.getDBConfig( ns );
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if ( ! config->isSharded( ns ) ){
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errmsg = "ns not sharded. have to shard before can split";
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return false;
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}
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BSONObj find = cmdObj.getObjectField( "find" );
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bool middle = false;
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if ( find.isEmpty() ){
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find = cmdObj.getObjectField( "middle" );
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middle = true;
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}
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if ( find.isEmpty() ){
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errmsg = "need to specify find or middle";
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return false;
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}
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ChunkManager * info = config->getChunkManager( ns );
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Chunk& old = info->findChunk( find );
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return _split( result , errmsg , ns , info , old , cmdObj.getObjectField( "middle" ) );
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}
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protected:
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string _name;
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};
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class SplitValueCommand : public SplitCollectionHelper {
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public:
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SplitValueCommand() : SplitCollectionHelper( "splitvalue" ){}
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virtual bool _split( BSONObjBuilder& result , string& errmsg , const string& ns , ChunkManager * manager , Chunk& old , BSONObj middle ){
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result << "shardinfo" << old.toString();
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result.appendBool( "auto" , middle.isEmpty() );
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if ( middle.isEmpty() )
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middle = old.pickSplitPoint();
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result.append( "middle" , middle );
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result << "ok" << 1;
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return true;
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}
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} splitValueCmd;
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class SplitCollection : public SplitCollectionHelper {
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public:
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SplitCollection() : SplitCollectionHelper( "split" ){}
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virtual bool _split( BSONObjBuilder& result , string& errmsg , const string& ns , ChunkManager * manager , Chunk& old , BSONObj middle ){
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log() << "splitting: " << ns << " shard: " << old << endl;
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if ( middle.isEmpty() )
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old.split();
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else
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old.split( middle );
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result << "ok" << 1;
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return true;
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}
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} splitCollectionCmd;
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class MoveChunkCmd : public GridAdminCmd {
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public:
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MoveChunkCmd() : GridAdminCmd( "movechunk" ){}
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virtual void help( stringstream& help ) const {
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help << "{ movechunk : 'test.foo' , find : { num : 1 } , to : 'localhost:30001' }";
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}
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bool run(const char *cmdns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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string ns = cmdObj["movechunk"].valuestrsafe();
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if ( ns.size() == 0 ){
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errmsg = "no ns";
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return false;
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}
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DBConfig * config = grid.getDBConfig( ns );
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if ( ! config->isSharded( ns ) ){
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errmsg = "ns not sharded. have to shard before can move a chunk";
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return false;
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}
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BSONObj find = cmdObj.getObjectField( "find" );
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if ( find.isEmpty() ){
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errmsg = "need to specify find. see help";
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return false;
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}
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string to = cmdObj["to"].valuestrsafe();
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if ( ! to.size() ){
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errmsg = "you have to specify where you want to move the chunk";
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return false;
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}
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ChunkManager * info = config->getChunkManager( ns );
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Chunk& c = info->findChunk( find );
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string from = c.getShard();
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if ( from == to ){
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errmsg = "that chunk is already on that shard";
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return false;
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}
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if ( ! grid.knowAboutShard( to ) ){
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errmsg = "that shard isn't known to me";
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return false;
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}
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if ( ! c.moveAndCommit( to , errmsg ) )
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return false;
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result << "ok" << 1;
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return true;
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}
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} moveChunkCmd;
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// ------------ server level commands -------------
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class ListShardsCmd : public GridAdminCmd {
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public:
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ListShardsCmd() : GridAdminCmd("listshards") { }
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virtual void help( stringstream& help ) const {
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help << "list all shards of the system";
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}
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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ScopedDbConnection conn( configServer.getPrimary() );
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vector<BSONObj> all;
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auto_ptr<DBClientCursor> cursor = conn->query( "config.shards" , BSONObj() );
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while ( cursor->more() ){
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BSONObj o = cursor->next();
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all.push_back( o );
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}
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result.append("shards" , all );
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result.append("ok" , 1 );
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conn.done();
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return true;
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}
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} listShardsCmd;
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/* a shard is a single mongod server or a replica pair. add it (them) to the cluster as a storage partition. */
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class AddShard : public GridAdminCmd {
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public:
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AddShard() : GridAdminCmd("addshard") { }
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virtual void help( stringstream& help ) const {
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help << "add a new shard to the system";
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}
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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ScopedDbConnection conn( configServer.getPrimary() );
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string host = cmdObj["addshard"].valuestrsafe();
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if ( host == "localhost" || host.find( "localhost:" ) == 0 ||
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host == "127.0.0.1" || host.find( "127.0.0.1:" ) == 0 ){
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if ( cmdObj["allowLocal"].type() != Bool ||
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! cmdObj["allowLocal"].boolean() ){
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errmsg =
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"can't use localhost as a shard since all shards need to communicate. "
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"allowLocal to override for testing";
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return false;
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}
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}
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BSONObj shard;
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{
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BSONObjBuilder b;
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b.append( "host" , host );
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if ( cmdObj["maxSize"].isNumber() )
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b.append( cmdObj["maxSize"] );
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shard = b.obj();
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}
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BSONObj old = conn->findOne( "config.shards" , shard );
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if ( ! old.isEmpty() ){
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result.append( "ok" , 0.0 );
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result.append( "msg" , "already exists" );
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conn.done();
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return false;
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}
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try {
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ScopedDbConnection newShardConn( host );
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newShardConn->getLastError();
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newShardConn.done();
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}
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catch ( DBException& e ){
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errmsg = "couldn't connect to new shard";
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result.append( "host" , host );
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result.append( "exception" , e.what() );
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result.append( "ok" , 0 );
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conn.done();
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return false;
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}
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conn->insert( "config.shards" , shard );
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result.append( "ok", 1 );
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result.append( "added" , shard["host"].valuestrsafe() );
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conn.done();
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return true;
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}
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} addServer;
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class RemoveShardCmd : public GridAdminCmd {
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public:
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RemoveShardCmd() : GridAdminCmd("removeshard") { }
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virtual void help( stringstream& help ) const {
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help << "remove a shard to the system.\nshard must be empty or command will return an error.";
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}
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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if ( 1 ){
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errmsg = "removeshard not yet implemented";
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return 0;
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}
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ScopedDbConnection conn( configServer.getPrimary() );
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BSONObj server = BSON( "host" << cmdObj["removeshard"].valuestrsafe() );
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conn->remove( "config.shards" , server );
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|
|
|
conn.done();
|
|
return true;
|
|
}
|
|
} removeShardCmd;
|
|
|
|
|
|
// --------------- public commands ----------------
|
|
|
|
class IsDbGridCmd : public Command {
|
|
public:
|
|
virtual bool slaveOk() {
|
|
return true;
|
|
}
|
|
IsDbGridCmd() : Command("isdbgrid") { }
|
|
bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool) {
|
|
result.append("isdbgrid", 1);
|
|
result.append("hostname", ourHostname);
|
|
result << "ok" << 1;
|
|
return true;
|
|
}
|
|
} isdbgrid;
|
|
|
|
class CmdIsMaster : public Command {
|
|
public:
|
|
virtual bool requiresAuth() { return false; }
|
|
virtual bool slaveOk() {
|
|
return true;
|
|
}
|
|
virtual void help( stringstream& help ) const {
|
|
help << "test if this is master half of a replica pair";
|
|
}
|
|
CmdIsMaster() : Command("ismaster") { }
|
|
virtual bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool) {
|
|
result.append("ismaster", 1.0 );
|
|
result.append("msg", "isdbgrid");
|
|
result.append("ok" , 1 );
|
|
return true;
|
|
}
|
|
} ismaster;
|
|
|
|
class CmdShardingGetPrevError : public Command {
|
|
public:
|
|
virtual bool requiresAuth() { return false; }
|
|
virtual bool slaveOk() {
|
|
return true;
|
|
}
|
|
virtual void help( stringstream& help ) const {
|
|
help << "get previous error (since last reseterror command)";
|
|
}
|
|
CmdShardingGetPrevError() : Command("getpreverror") { }
|
|
virtual bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool) {
|
|
errmsg += "getpreverror not supported for sharded environments";
|
|
result << "ok" << 0;
|
|
return false;
|
|
}
|
|
} cmdGetPrevError;
|
|
|
|
class CmdShardingGetLastError : public Command {
|
|
public:
|
|
virtual bool requiresAuth() { return false; }
|
|
virtual bool slaveOk() {
|
|
return true;
|
|
}
|
|
virtual void help( stringstream& help ) const {
|
|
help << "check for an error on the last command executed";
|
|
}
|
|
CmdShardingGetLastError() : Command("getlasterror") { }
|
|
virtual bool run(const char *nsraw, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool) {
|
|
string dbName = nsraw;
|
|
dbName = dbName.substr( 0 , dbName.size() - 5 );
|
|
|
|
DBConfig * conf = grid.getDBConfig( dbName , false );
|
|
|
|
ClientInfo * client = ClientInfo::get();
|
|
set<string> * shards = client->getPrev();
|
|
|
|
if ( shards->size() == 0 ){
|
|
result.appendNull( "err" );
|
|
result.append( "ok" , 1 );
|
|
return true;
|
|
}
|
|
|
|
if ( shards->size() == 1 ){
|
|
string theShard = *(shards->begin() );
|
|
result.append( "theshard" , theShard.c_str() );
|
|
ScopedDbConnection conn( theShard );
|
|
BSONObj res;
|
|
bool ok = conn->runCommand( conf->getName() , cmdObj , res );
|
|
result.appendElements( res );
|
|
conn.done();
|
|
return ok;
|
|
}
|
|
|
|
vector<string> errors;
|
|
for ( set<string>::iterator i = shards->begin(); i != shards->end(); i++ ){
|
|
string theShard = *i;
|
|
ScopedDbConnection conn( theShard );
|
|
string temp = conn->getLastError();
|
|
if ( temp.size() )
|
|
errors.push_back( temp );
|
|
conn.done();
|
|
}
|
|
|
|
if ( errors.size() == 0 ){
|
|
result.appendNull( "err" );
|
|
result.append( "ok" , 1 );
|
|
return true;
|
|
}
|
|
|
|
result.append( "err" , errors[0].c_str() );
|
|
|
|
BSONObjBuilder all;
|
|
for ( unsigned i=0; i<errors.size(); i++ ){
|
|
all.append( all.numStr( i ).c_str() , errors[i].c_str() );
|
|
}
|
|
result.appendArray( "errs" , all.obj() );
|
|
result.append( "ok" , 1 );
|
|
return true;
|
|
}
|
|
} cmdGetLastError;
|
|
|
|
}
|
|
|
|
} // namespace mongo
|