forked from mongodb/mongo
/
commands_admin.cpp
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commands_admin.cpp
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// s/commands_admin.cpp
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* TODO
_ concurrency control.
_ limit() works right?
_ KillCursors
later
_ secondary indexes
*/
#include "pch.h"
#include "../util/net/message.h"
#include "../util/net/listen.h"
#include "../util/processinfo.h"
#include "../util/stringutils.h"
#include "../util/version.h"
#include "../util/timer.h"
#include "../client/connpool.h"
#include "../db/dbmessage.h"
#include "../db/commands.h"
#include "../db/stats/counters.h"
#include "config.h"
#include "chunk.h"
#include "grid.h"
#include "strategy.h"
#include "stats.h"
#include "writeback_listener.h"
#include "client.h"
#include "../util/ramlog.h"
namespace mongo {
namespace dbgrid_cmds {
class GridAdminCmd : public Command {
public:
GridAdminCmd( const char * n ) : Command( n , false, tolowerString(n).c_str() ) {
}
virtual bool slaveOk() const {
return true;
}
virtual bool adminOnly() const {
return true;
}
// all grid commands are designed not to lock
virtual LockType locktype() const { return NONE; }
bool okForConfigChanges( string& errmsg ) {
string e;
if ( ! configServer.allUp(e) ) {
errmsg = str::stream() << "not all config servers are up: " << e;
return false;
}
return true;
}
};
// --------------- misc commands ----------------------
class NetStatCmd : public GridAdminCmd {
public:
NetStatCmd() : GridAdminCmd("netstat") { }
virtual void help( stringstream& help ) const {
help << " shows status/reachability of servers in the cluster";
}
bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
result.append("configserver", configServer.getPrimary().getConnString() );
result.append("isdbgrid", 1);
return true;
}
} netstat;
class FlushRouterConfigCmd : public GridAdminCmd {
public:
FlushRouterConfigCmd() : GridAdminCmd("flushRouterConfig") { }
virtual void help( stringstream& help ) const {
help << "flush all router config";
}
bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
grid.flushConfig();
result.appendBool( "flushed" , true );
return true;
}
} flushRouterConfigCmd;
class ServerStatusCmd : public Command {
public:
ServerStatusCmd() : Command( "serverStatus" , true ) {
_started = time(0);
}
virtual bool slaveOk() const { return true; }
virtual LockType locktype() const { return NONE; }
bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
result.append( "host" , prettyHostName() );
result.append("version", versionString);
result.append("process","mongos");
result.append("uptime",(double) (time(0)-_started));
result.appendDate( "localTime" , jsTime() );
{
BSONObjBuilder t( result.subobjStart( "mem" ) );
ProcessInfo p;
if ( p.supported() ) {
t.appendNumber( "resident" , p.getResidentSize() );
t.appendNumber( "virtual" , p.getVirtualMemorySize() );
t.appendBool( "supported" , true );
}
else {
result.append( "note" , "not all mem info support on this platform" );
t.appendBool( "supported" , false );
}
t.done();
}
{
BSONObjBuilder bb( result.subobjStart( "connections" ) );
bb.append( "current" , connTicketHolder.used() );
bb.append( "available" , connTicketHolder.available() );
bb.done();
}
{
BSONObjBuilder bb( result.subobjStart( "extra_info" ) );
bb.append("note", "fields vary by platform");
ProcessInfo p;
p.getExtraInfo(bb);
bb.done();
}
result.append( "opcounters" , globalOpCounters.getObj() );
{
BSONObjBuilder bb( result.subobjStart( "ops" ) );
bb.append( "sharded" , opsSharded.getObj() );
bb.append( "notSharded" , opsNonSharded.getObj() );
bb.done();
}
result.append( "shardCursorType" , shardedCursorTypes.getObj() );
{
BSONObjBuilder asserts( result.subobjStart( "asserts" ) );
asserts.append( "regular" , assertionCount.regular );
asserts.append( "warning" , assertionCount.warning );
asserts.append( "msg" , assertionCount.msg );
asserts.append( "user" , assertionCount.user );
asserts.append( "rollovers" , assertionCount.rollovers );
asserts.done();
}
{
BSONObjBuilder bb( result.subobjStart( "network" ) );
networkCounter.append( bb );
bb.done();
}
{
RamLog* rl = RamLog::get( "warnings" );
verify(15879, rl);
if (rl->lastWrite() >= time(0)-(10*60)){ // only show warnings from last 10 minutes
vector<const char*> lines;
rl->get( lines );
BSONArrayBuilder arr( result.subarrayStart( "warnings" ) );
for ( unsigned i=std::max(0,(int)lines.size()-10); i<lines.size(); i++ )
arr.append( lines[i] );
arr.done();
}
}
return 1;
}
time_t _started;
} cmdServerStatus;
class FsyncCommand : public GridAdminCmd {
public:
FsyncCommand() : GridAdminCmd( "fsync" ) {}
bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
if ( cmdObj["lock"].trueValue() ) {
errmsg = "can't do lock through mongos";
return false;
}
BSONObjBuilder sub;
bool ok = true;
int numFiles = 0;
vector<Shard> shards;
Shard::getAllShards( shards );
for ( vector<Shard>::iterator i=shards.begin(); i!=shards.end(); i++ ) {
Shard s = *i;
BSONObj x = s.runCommand( "admin" , "fsync" );
sub.append( s.getName() , x );
if ( ! x["ok"].trueValue() ) {
ok = false;
errmsg = x["errmsg"].String();
}
numFiles += x["numFiles"].numberInt();
}
result.append( "numFiles" , numFiles );
result.append( "all" , sub.obj() );
return ok;
}
} fsyncCmd;
// ------------ database level commands -------------
class MoveDatabasePrimaryCommand : public GridAdminCmd {
public:
MoveDatabasePrimaryCommand() : GridAdminCmd("movePrimary") { }
virtual void help( stringstream& help ) const {
help << " example: { moveprimary : 'foo' , to : 'localhost:9999' }";
}
bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string dbname = cmdObj.firstElement().valuestrsafe();
if ( dbname.size() == 0 ) {
errmsg = "no db";
return false;
}
if ( dbname == "config" ) {
errmsg = "can't move config db";
return false;
}
DBConfigPtr config = grid.getDBConfig( dbname , false );
if ( ! config ) {
errmsg = "can't find db!";
return false;
}
string to = cmdObj["to"].valuestrsafe();
if ( ! to.size() ) {
errmsg = "you have to specify where you want to move it";
return false;
}
Shard s = Shard::make( to );
if ( config->getPrimary() == s.getConnString() ) {
errmsg = "it is already the primary";
return false;
}
if ( ! grid.knowAboutShard( s.getConnString() ) ) {
errmsg = "that server isn't known to me";
return false;
}
log() << "Moving " << dbname << " primary from: " << config->getPrimary().toString()
<< " to: " << s.toString() << endl;
// Locking enabled now...
DistributedLock lockSetup( configServer.getConnectionString(), dbname + "-movePrimary" );
dist_lock_try dlk;
// Distributed locking added.
try{
dlk = dist_lock_try( &lockSetup , string("Moving primary shard of ") + dbname );
}
catch( LockException& e ){
errmsg = str::stream() << "error locking distributed lock to move primary shard of " << dbname << causedBy( e );
warning() << errmsg << endl;
return false;
}
if ( ! dlk.got() ) {
errmsg = (string)"metadata lock is already taken for moving " + dbname;
return false;
}
ScopedDbConnection toconn( s.getConnString() );
// TODO ERH - we need a clone command which replays operations from clone start to now
// can just use local.oplog.$main
BSONObj cloneRes;
bool worked = toconn->runCommand( dbname.c_str() , BSON( "clone" << config->getPrimary().getConnString() ) , cloneRes );
toconn.done();
if ( ! worked ) {
log() << "clone failed" << cloneRes << endl;
errmsg = "clone failed";
return false;
}
ScopedDbConnection fromconn( config->getPrimary() );
config->setPrimary( s.getConnString() );
log() << "movePrimary: dropping " << dbname << " from old" << endl;
fromconn->dropDatabase( dbname.c_str() );
fromconn.done();
result << "primary " << s.toString();
return true;
}
} movePrimary;
class EnableShardingCmd : public GridAdminCmd {
public:
EnableShardingCmd() : GridAdminCmd( "enableSharding" ) {}
virtual void help( stringstream& help ) const {
help
<< "Enable sharding for a db. (Use 'shardcollection' command afterwards.)\n"
<< " { enablesharding : \"<dbname>\" }\n";
}
bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string dbname = cmdObj.firstElement().valuestrsafe();
if ( dbname.size() == 0 ) {
errmsg = "no db";
return false;
}
if ( dbname == "admin" ) {
errmsg = "can't shard the admin db";
return false;
}
if ( dbname == "local" ) {
errmsg = "can't shard the local db";
return false;
}
DBConfigPtr config = grid.getDBConfig( dbname );
if ( config->isShardingEnabled() ) {
errmsg = "already enabled";
return false;
}
if ( ! okForConfigChanges( errmsg ) )
return false;
log() << "enabling sharding on: " << dbname << endl;
config->enableSharding();
return true;
}
} enableShardingCmd;
// ------------ collection level commands -------------
class ShardCollectionCmd : public GridAdminCmd {
public:
ShardCollectionCmd() : GridAdminCmd( "shardCollection" ) {}
virtual void help( stringstream& help ) const {
help
<< "Shard a collection. Requires key. Optional unique. Sharding must already be enabled for the database.\n"
<< " { enablesharding : \"<dbname>\" }\n";
}
bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string ns = cmdObj.firstElement().valuestrsafe();
if ( ns.size() == 0 ) {
errmsg = "no ns";
return false;
}
DBConfigPtr config = grid.getDBConfig( ns );
if ( ! config->isShardingEnabled() ) {
errmsg = "sharding not enabled for db";
return false;
}
if ( config->isSharded( ns ) ) {
errmsg = "already sharded";
return false;
}
BSONObj key = cmdObj.getObjectField( "key" );
if ( key.isEmpty() ) {
errmsg = "no shard key";
return false;
}
BSONForEach(e, key) {
if (!e.isNumber() || e.number() != 1.0) {
errmsg = "shard keys must all be ascending";
return false;
}
}
if ( ns.find( ".system." ) != string::npos ) {
errmsg = "can't shard system namespaces";
return false;
}
if ( ! okForConfigChanges( errmsg ) )
return false;
// Sharding interacts with indexing in at least three ways:
//
// 1. A unique index must have the sharding key as its prefix. Otherwise maintaining uniqueness would
// require coordinated access to all shards. Trying to shard a collection with such an index is not
// allowed.
//
// 2. Sharding a collection requires an index over the sharding key. That index must be create upfront.
// The rationale is that sharding a non-empty collection would need to create the index and that could
// be slow. Requiring the index upfront allows the admin to plan before sharding and perhaps use
// background index construction. One exception to the rule: empty collections. It's fairly easy to
// create the index as part of the sharding process.
//
// 3. If unique : true is specified, we require that the sharding index be unique or created as unique.
//
// We enforce both these conditions in what comes next.
bool careAboutUnique = cmdObj["unique"].trueValue();
{
ShardKeyPattern proposedKey( key );
bool hasShardIndex = false;
bool hasUniqueShardIndex = false;
ScopedDbConnection conn( config->getPrimary() );
BSONObjBuilder b;
b.append( "ns" , ns );
BSONArrayBuilder allIndexes;
auto_ptr<DBClientCursor> cursor = conn->query( config->getName() + ".system.indexes" , b.obj() );
while ( cursor->more() ) {
BSONObj idx = cursor->next();
allIndexes.append( idx );
bool idIndex = ! idx["name"].eoo() && idx["name"].String() == "_id_";
bool uniqueIndex = ( ! idx["unique"].eoo() && idx["unique"].trueValue() ) ||
idIndex;
// Is index key over the sharding key? Remember that.
if ( key.woCompare( idx["key"].embeddedObjectUserCheck() ) == 0 ) {
if( idx["sparse"].trueValue() ){
errmsg = (string)"can't shard collection " + ns + " with sparse shard key index";
conn.done();
return false;
}
hasShardIndex = true;
hasUniqueShardIndex = uniqueIndex;
continue;
}
// Not a unique index? Move on.
if ( ! uniqueIndex || idIndex )
continue;
// Shard key is prefix of unique index? Move on.
if ( proposedKey.isPrefixOf( idx["key"].embeddedObjectUserCheck() ) )
continue;
errmsg = str::stream() << "can't shard collection '" << ns << "' with unique index on: " + idx.toString()
<< ", uniqueness can't be maintained across unless shard key index is a prefix";
conn.done();
return false;
}
if( careAboutUnique && hasShardIndex && ! hasUniqueShardIndex ){
errmsg = (string)"can't shard collection " + ns + ", shard key index not unique and unique index explicitly specified";
conn.done();
return false;
}
BSONObj res = conn->findOne( config->getName() + ".system.namespaces" , BSON( "name" << ns ) );
if ( res["options"].type() == Object && res["options"].embeddedObject()["capped"].trueValue() ) {
errmsg = "can't shard capped collection";
conn.done();
return false;
}
if ( hasShardIndex ) {
// make sure there are no null entries in the sharding index
BSONObjBuilder cmd;
cmd.append( "checkShardingIndex" , ns );
cmd.append( "keyPattern" , key );
BSONObj cmdObj = cmd.obj();
if ( ! conn->runCommand( "admin" , cmdObj , res )) {
errmsg = res["errmsg"].str();
conn.done();
return false;
}
}
if ( ! hasShardIndex && ( conn->count( ns ) != 0 ) ) {
errmsg = "please create an index over the sharding key before sharding.";
result.append( "proposedKey" , key );
result.appendArray( "curIndexes" , allIndexes.done() );
conn.done();
return false;
}
conn.done();
}
tlog() << "CMD: shardcollection: " << cmdObj << endl;
config->shardCollection( ns , key , careAboutUnique );
result << "collectionsharded" << ns;
return true;
}
} shardCollectionCmd;
class GetShardVersion : public GridAdminCmd {
public:
GetShardVersion() : GridAdminCmd( "getShardVersion" ) {}
virtual void help( stringstream& help ) const {
help << " example: { getShardVersion : 'alleyinsider.foo' } ";
}
bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string ns = cmdObj.firstElement().valuestrsafe();
if ( ns.size() == 0 ) {
errmsg = "need to specify fully namespace";
return false;
}
DBConfigPtr config = grid.getDBConfig( ns );
if ( ! config->isSharded( ns ) ) {
errmsg = "ns not sharded.";
return false;
}
ChunkManagerPtr cm = config->getChunkManagerIfExists( ns );
if ( ! cm ) {
errmsg = "no chunk manager?";
return false;
}
cm->_printChunks();
result.appendTimestamp( "version" , cm->getVersion().toLong() );
return 1;
}
} getShardVersionCmd;
class SplitCollectionCmd : public GridAdminCmd {
public:
SplitCollectionCmd() : GridAdminCmd( "split" ) {}
virtual void help( stringstream& help ) const {
help
<< " example: - split the shard that contains give key \n"
<< " { split : 'alleyinsider.blog.posts' , find : { ts : 1 } }\n"
<< " example: - split the shard that contains the key with this as the middle \n"
<< " { split : 'alleyinsider.blog.posts' , middle : { ts : 1 } }\n"
<< " NOTE: this does not move move the chunks, it merely creates a logical separation \n"
;
}
bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
if ( ! okForConfigChanges( errmsg ) )
return false;
ShardConnection::sync();
string ns = cmdObj.firstElement().valuestrsafe();
if ( ns.size() == 0 ) {
errmsg = "no ns";
return false;
}
DBConfigPtr config = grid.getDBConfig( ns );
if ( ! config->isSharded( ns ) ) {
config->reload();
if ( ! config->isSharded( ns ) ) {
errmsg = "ns not sharded. have to shard before can split";
return false;
}
}
BSONObj find = cmdObj.getObjectField( "find" );
if ( find.isEmpty() ) {
find = cmdObj.getObjectField( "middle" );
if ( find.isEmpty() ) {
errmsg = "need to specify find or middle";
return false;
}
}
ChunkManagerPtr info = config->getChunkManager( ns );
ChunkPtr chunk = info->findChunk( find );
BSONObj middle = cmdObj.getObjectField( "middle" );
assert( chunk.get() );
log() << "splitting: " << ns << " shard: " << chunk << endl;
BSONObj res;
bool worked;
if ( middle.isEmpty() ) {
BSONObj ret = chunk->singleSplit( true /* force a split even if not enough data */ , res );
worked = !ret.isEmpty();
}
else {
// sanity check if the key provided is a valid split point
if ( ( middle == chunk->getMin() ) || ( middle == chunk->getMax() ) ) {
errmsg = "cannot split on initial or final chunk's key";
return false;
}
if (!fieldsMatch(middle, info->getShardKey().key())){
errmsg = "middle has different fields (or different order) than shard key";
return false;
}
vector<BSONObj> splitPoints;
splitPoints.push_back( middle );
worked = chunk->multiSplit( splitPoints , res );
}
if ( !worked ) {
errmsg = "split failed";
result.append( "cause" , res );
return false;
}
config->getChunkManager( ns , true );
return true;
}
} splitCollectionCmd;
class MoveChunkCmd : public GridAdminCmd {
public:
MoveChunkCmd() : GridAdminCmd( "moveChunk" ) {}
virtual void help( stringstream& help ) const {
help << "{ movechunk : 'test.foo' , find : { num : 1 } , to : 'localhost:30001' }";
}
bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
if ( ! okForConfigChanges( errmsg ) )
return false;
ShardConnection::sync();
Timer t;
string ns = cmdObj.firstElement().valuestrsafe();
if ( ns.size() == 0 ) {
errmsg = "no ns";
return false;
}
DBConfigPtr config = grid.getDBConfig( ns );
if ( ! config->isSharded( ns ) ) {
config->reload();
if ( ! config->isSharded( ns ) ) {
errmsg = "ns not sharded. have to shard before we can move a chunk";
return false;
}
}
BSONObj find = cmdObj.getObjectField( "find" );
if ( find.isEmpty() ) {
errmsg = "need to specify find. see help";
return false;
}
string toString = cmdObj["to"].valuestrsafe();
if ( ! toString.size() ) {
errmsg = "you have to specify where you want to move the chunk";
return false;
}
Shard to = Shard::make( toString );
// so far, chunk size serves test purposes; it may or may not become a supported parameter
long long maxChunkSizeBytes = cmdObj["maxChunkSizeBytes"].numberLong();
if ( maxChunkSizeBytes == 0 ) {
maxChunkSizeBytes = Chunk::MaxChunkSize;
}
tlog() << "CMD: movechunk: " << cmdObj << endl;
ChunkManagerPtr info = config->getChunkManager( ns );
ChunkPtr c = info->findChunk( find );
const Shard& from = c->getShard();
if ( from == to ) {
errmsg = "that chunk is already on that shard";
return false;
}
BSONObj res;
if ( ! c->moveAndCommit( to , maxChunkSizeBytes , res ) ) {
errmsg = "move failed";
result.append( "cause" , res );
return false;
}
// preemptively reload the config to get new version info
config->getChunkManager( ns , true );
result.append( "millis" , t.millis() );
return true;
}
} moveChunkCmd;
// ------------ server level commands -------------
class ListShardsCmd : public GridAdminCmd {
public:
ListShardsCmd() : GridAdminCmd("listShards") { }
virtual void help( stringstream& help ) const {
help << "list all shards of the system";
}
bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
ScopedDbConnection conn( configServer.getPrimary() );
vector<BSONObj> all;
auto_ptr<DBClientCursor> cursor = conn->query( "config.shards" , BSONObj() );
while ( cursor->more() ) {
BSONObj o = cursor->next();
all.push_back( o );
}
result.append("shards" , all );
conn.done();
return true;
}
} listShardsCmd;
/* a shard is a single mongod server or a replica pair. add it (them) to the cluster as a storage partition. */
class AddShard : public GridAdminCmd {
public:
AddShard() : GridAdminCmd("addShard") { }
virtual void help( stringstream& help ) const {
help << "add a new shard to the system";
}
bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
errmsg.clear();
// get replica set component hosts
ConnectionString servers = ConnectionString::parse( cmdObj.firstElement().valuestrsafe() , errmsg );
if ( ! errmsg.empty() ) {
log() << "addshard request " << cmdObj << " failed:" << errmsg << endl;
return false;
}
// using localhost in server names implies every other process must use localhost addresses too
vector<HostAndPort> serverAddrs = servers.getServers();
for ( size_t i = 0 ; i < serverAddrs.size() ; i++ ) {
if ( serverAddrs[i].isLocalHost() != grid.allowLocalHost() ) {
errmsg = str::stream() <<
"can't use localhost as a shard since all shards need to communicate. " <<
"either use all shards and configdbs in localhost or all in actual IPs " <<
" host: " << serverAddrs[i].toString() << " isLocalHost:" << serverAddrs[i].isLocalHost();
log() << "addshard request " << cmdObj << " failed: attempt to mix localhosts and IPs" << endl;
return false;
}
// it's fine if mongods of a set all use default port
if ( ! serverAddrs[i].hasPort() ) {
serverAddrs[i].setPort( CmdLine::ShardServerPort );
}
}
// name is optional; addShard will provide one if needed
string name = "";
if ( cmdObj["name"].type() == String ) {
name = cmdObj["name"].valuestrsafe();
}
// maxSize is the space usage cap in a shard in MBs
long long maxSize = 0;
if ( cmdObj[ ShardFields::maxSize.name() ].isNumber() ) {
maxSize = cmdObj[ ShardFields::maxSize.name() ].numberLong();
}
if ( ! grid.addShard( &name , servers , maxSize , errmsg ) ) {
log() << "addshard request " << cmdObj << " failed: " << errmsg << endl;
return false;
}
result << "shardAdded" << name;
return true;
}
} addServer;
/* See usage docs at:
* http://www.mongodb.org/display/DOCS/Configuring+Sharding#ConfiguringSharding-Removingashard
*/
class RemoveShardCmd : public GridAdminCmd {
public:
RemoveShardCmd() : GridAdminCmd("removeShard") { }
virtual void help( stringstream& help ) const {
help << "remove a shard to the system.";
}
bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string target = cmdObj.firstElement().valuestrsafe();
Shard s = Shard::make( target );
if ( ! grid.knowAboutShard( s.getConnString() ) ) {
errmsg = "unknown shard";
return false;
}
ScopedDbConnection conn( configServer.getPrimary() );
if (conn->count("config.shards", BSON("_id" << NE << s.getName() << ShardFields::draining(true)))){
conn.done();
errmsg = "Can't have more than one draining shard at a time";
return false;
}
if (conn->count("config.shards", BSON("_id" << NE << s.getName())) == 0){
conn.done();
errmsg = "Can't remove last shard";
return false;
}
BSONObj primaryDoc = BSON( "_id" << NE << "local" << "primary" << s.getName() );
BSONObj dbInfo; // appended at end of result on success
{
boost::scoped_ptr<DBClientCursor> cursor (conn->query("config.databases", primaryDoc));
if (cursor->more()) { // skip block and allocations if empty
BSONObjBuilder dbInfoBuilder;
dbInfoBuilder.append("note", "you need to drop or movePrimary these databases");
BSONArrayBuilder dbs(dbInfoBuilder.subarrayStart("dbsToMove"));
while (cursor->more()){
BSONObj db = cursor->nextSafe();
dbs.append(db["_id"]);
}
dbs.doneFast();
dbInfo = dbInfoBuilder.obj();
}
}
// If the server is not yet draining chunks, put it in draining mode.
BSONObj searchDoc = BSON( "_id" << s.getName() );
BSONObj drainingDoc = BSON( "_id" << s.getName() << ShardFields::draining(true) );
BSONObj shardDoc = conn->findOne( "config.shards", drainingDoc );
if ( shardDoc.isEmpty() ) {
// TODO prevent move chunks to this shard.
log() << "going to start draining shard: " << s.getName() << endl;
BSONObj newStatus = BSON( "$set" << BSON( ShardFields::draining(true) ) );
conn->update( "config.shards" , searchDoc , newStatus, false /* do no upsert */);
errmsg = conn->getLastError();
if ( errmsg.size() ) {
log() << "error starting remove shard: " << s.getName() << " err: " << errmsg << endl;
return false;
}
BSONObj primaryLocalDoc = BSON("_id" << "local" << "primary" << s.getName() );
PRINT(primaryLocalDoc);
if (conn->count("config.databases", primaryLocalDoc)) {
log() << "This shard is listed as primary of local db. Removing entry." << endl;
conn->remove("config.databases", BSON("_id" << "local"));
errmsg = conn->getLastError();
if ( errmsg.size() ) {
log() << "error removing local db: " << errmsg << endl;
return false;
}
}
Shard::reloadShardInfo();
result.append( "msg" , "draining started successfully" );
result.append( "state" , "started" );
result.append( "shard" , s.getName() );
result.appendElements(dbInfo);
conn.done();
return true;
}
// If the server has been completely drained, remove it from the ConfigDB.
// Check not only for chunks but also databases.
BSONObj shardIDDoc = BSON( "shard" << shardDoc[ "_id" ].str() );
long long chunkCount = conn->count( "config.chunks" , shardIDDoc );
long long dbCount = conn->count( "config.databases" , primaryDoc );
if ( ( chunkCount == 0 ) && ( dbCount == 0 ) ) {
log() << "going to remove shard: " << s.getName() << endl;
conn->remove( "config.shards" , searchDoc );
errmsg = conn->getLastError();
if ( errmsg.size() ) {
log() << "error concluding remove shard: " << s.getName() << " err: " << errmsg << endl;
return false;
}
Shard::removeShard( shardDoc[ "_id" ].str() );
Shard::reloadShardInfo();
result.append( "msg" , "removeshard completed successfully" );
result.append( "state" , "completed" );
result.append( "shard" , s.getName() );
conn.done();
return true;
}
// If the server is already in draining mode, just report on its progress.
// Report on databases (not just chunks) that are left too.
result.append( "msg" , "draining ongoing" );
result.append( "state" , "ongoing" );
BSONObjBuilder inner;
inner.append( "chunks" , chunkCount );
inner.append( "dbs" , dbCount );
result.append( "remaining" , inner.obj() );
result.appendElements(dbInfo);
conn.done();
return true;
}
} removeShardCmd;
// --------------- public commands ----------------
class IsDbGridCmd : public Command {
public:
virtual LockType locktype() const { return NONE; }
virtual bool requiresAuth() { return false; }
virtual bool slaveOk() const {
return true;
}
IsDbGridCmd() : Command("isdbgrid") { }
bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
result.append("isdbgrid", 1);
result.append("hostname", getHostNameCached());
return true;
}
} isdbgrid;
class CmdIsMaster : public Command {
public:
virtual LockType locktype() const { return NONE; }
virtual bool requiresAuth() { return false; }
virtual bool slaveOk() const {
return true;
}
virtual void help( stringstream& help ) const {
help << "test if this is master half of a replica pair";
}
CmdIsMaster() : Command("isMaster" , false , "ismaster") { }
virtual bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
result.appendBool("ismaster", true );
result.append("msg", "isdbgrid");
result.appendNumber("maxBsonObjectSize", BSONObjMaxUserSize);
return true;
}
} ismaster;
class CmdWhatsMyUri : public Command {
public:
CmdWhatsMyUri() : Command("whatsmyuri") { }
virtual bool logTheOp() {
return false; // the modification will be logged directly
}
virtual bool slaveOk() const {
return true;
}
virtual LockType locktype() const { return NONE; }
virtual void help( stringstream &help ) const {
help << "{whatsmyuri:1}";
}
virtual bool run(const string& , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
result << "you" << ClientInfo::get()->getRemote();
return true;
}
} cmdWhatsMyUri;