forked from mongodb/mongo
/
commands_public.cpp
1432 lines (1175 loc) · 62.3 KB
/
commands_public.cpp
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// s/commands_public.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/>.
*/
#include "pch.h"
#include "../util/net/message.h"
#include "../db/dbmessage.h"
#include "../client/connpool.h"
#include "../client/parallel.h"
#include "../db/commands.h"
#include "../db/queryutil.h"
#include "../scripting/engine.h"
#include "../util/timer.h"
#include "config.h"
#include "chunk.h"
#include "strategy.h"
#include "grid.h"
#include "mr_shard.h"
#include "client.h"
namespace mongo {
bool setParmsMongodSpecific(const string& dbname, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool fromRepl )
{
return true;
}
namespace dbgrid_pub_cmds {
class PublicGridCommand : public Command {
public:
PublicGridCommand( const char* n, const char* oldname=NULL ) : Command( n, false, oldname ) {
}
virtual bool slaveOk() const {
return true;
}
virtual bool adminOnly() const {
return false;
}
// Override if passthrough should also send query options
// Safer as off by default, can slowly enable as we add more tests
virtual bool passOptions() const { return false; }
// all grid commands are designed not to lock
virtual LockType locktype() const { return NONE; }
protected:
bool passthrough( DBConfigPtr conf, const BSONObj& cmdObj , BSONObjBuilder& result ) {
return _passthrough(conf->getName(), conf, cmdObj, 0, result);
}
bool adminPassthrough( DBConfigPtr conf, const BSONObj& cmdObj , BSONObjBuilder& result ) {
return _passthrough("admin", conf, cmdObj, 0, result);
}
bool passthrough( DBConfigPtr conf, const BSONObj& cmdObj , int options, BSONObjBuilder& result ) {
return _passthrough(conf->getName(), conf, cmdObj, options, result);
}
bool adminPassthrough( DBConfigPtr conf, const BSONObj& cmdObj , int options, BSONObjBuilder& result ) {
return _passthrough("admin", conf, cmdObj, options, result);
}
private:
bool _passthrough(const string& db, DBConfigPtr conf, const BSONObj& cmdObj , int options , BSONObjBuilder& result ) {
ShardConnection conn( conf->getPrimary() , "" );
BSONObj res;
bool ok = conn->runCommand( db , cmdObj , res , passOptions() ? options : 0 );
if ( ! ok && res["code"].numberInt() == SendStaleConfigCode ) {
conn.done();
throw RecvStaleConfigException( res["ns"].toString(),"command failed because of stale config");
}
result.appendElements( res );
conn.done();
return ok;
}
};
class RunOnAllShardsCommand : public Command {
public:
RunOnAllShardsCommand(const char* n, const char* oldname=NULL) : Command(n, false, oldname) {}
virtual bool slaveOk() const { return true; }
virtual bool adminOnly() const { return false; }
// all grid commands are designed not to lock
virtual LockType locktype() const { return NONE; }
// default impl uses all shards for DB
virtual void getShards(const string& dbName , BSONObj& cmdObj, set<Shard>& shards) {
DBConfigPtr conf = grid.getDBConfig( dbName , false );
conf->getAllShards(shards);
}
virtual void aggregateResults(const vector<BSONObj>& results, BSONObjBuilder& output) {}
// don't override
virtual bool run(const string& dbName , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& output, bool) {
LOG(1) << "RunOnAllShardsCommand db: " << dbName << " cmd:" << cmdObj << endl;
set<Shard> shards;
getShards(dbName, cmdObj, shards);
list< shared_ptr<Future::CommandResult> > futures;
for ( set<Shard>::const_iterator i=shards.begin(), end=shards.end() ; i != end ; i++ ) {
futures.push_back( Future::spawnCommand( i->getConnString() , dbName , cmdObj, 0 ) );
}
vector<BSONObj> results;
BSONObjBuilder subobj (output.subobjStart("raw"));
BSONObjBuilder errors;
for ( list< shared_ptr<Future::CommandResult> >::iterator i=futures.begin(); i!=futures.end(); i++ ) {
shared_ptr<Future::CommandResult> res = *i;
if ( ! res->join() ) {
errors.appendAs(res->result()["errmsg"], res->getServer());
}
results.push_back( res->result() );
subobj.append( res->getServer() , res->result() );
}
subobj.done();
BSONObj errobj = errors.done();
if (! errobj.isEmpty()) {
errmsg = errobj.toString(false, true);
return false;
}
aggregateResults(results, output);
return true;
}
};
class AllShardsCollectionCommand : public RunOnAllShardsCommand {
public:
AllShardsCollectionCommand(const char* n, const char* oldname=NULL) : RunOnAllShardsCommand(n, oldname) {}
virtual void getShards(const string& dbName , BSONObj& cmdObj, set<Shard>& shards) {
string fullns = dbName + '.' + cmdObj.firstElement().valuestrsafe();
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
shards.insert(conf->getShard(fullns));
}
else {
conf->getChunkManager(fullns)->getAllShards(shards);
}
}
};
class NotAllowedOnShardedCollectionCmd : public PublicGridCommand {
public:
NotAllowedOnShardedCollectionCmd( const char * n ) : PublicGridCommand( n ) {}
virtual string getFullNS( const string& dbName , const BSONObj& cmdObj ) = 0;
virtual bool run(const string& dbName , BSONObj& cmdObj, int options, string& errmsg, BSONObjBuilder& result, bool) {
string fullns = getFullNS( dbName , cmdObj );
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
return passthrough( conf , cmdObj , options, result );
}
errmsg = "can't do command: " + name + " on sharded collection";
return false;
}
};
// ----
class DropIndexesCmd : public AllShardsCollectionCommand {
public:
DropIndexesCmd() : AllShardsCollectionCommand("dropIndexes", "deleteIndexes") {}
} dropIndexesCmd;
class ReIndexCmd : public AllShardsCollectionCommand {
public:
ReIndexCmd() : AllShardsCollectionCommand("reIndex") {}
} reIndexCmd;
class ProfileCmd : public PublicGridCommand {
public:
ProfileCmd() : PublicGridCommand("profile") {}
virtual bool run(const string& dbName , BSONObj& cmdObj, int options, string& errmsg, BSONObjBuilder& result, bool) {
errmsg = "profile currently not supported via mongos";
return false;
}
} profileCmd;
class ValidateCmd : public AllShardsCollectionCommand {
public:
ValidateCmd() : AllShardsCollectionCommand("validate") {}
virtual void aggregateResults(const vector<BSONObj>& results, BSONObjBuilder& output) {
for (vector<BSONObj>::const_iterator it(results.begin()), end(results.end()); it!=end; it++){
const BSONObj& result = *it;
const BSONElement valid = result["valid"];
if (!valid.eoo()){
if (!valid.trueValue()) {
output.appendBool("valid", false);
return;
}
}
else {
// Support pre-1.9.0 output with everything in a big string
const char* s = result["result"].valuestrsafe();
if (strstr(s, "exception") || strstr(s, "corrupt")){
output.appendBool("valid", false);
return;
}
}
}
output.appendBool("valid", true);
}
} validateCmd;
class RepairDatabaseCmd : public RunOnAllShardsCommand {
public:
RepairDatabaseCmd() : RunOnAllShardsCommand("repairDatabase") {}
} repairDatabaseCmd;
class DBStatsCmd : public RunOnAllShardsCommand {
public:
DBStatsCmd() : RunOnAllShardsCommand("dbStats", "dbstats") {}
virtual void aggregateResults(const vector<BSONObj>& results, BSONObjBuilder& output) {
long long objects = 0;
long long dataSize = 0;
long long storageSize = 0;
long long numExtents = 0;
long long indexes = 0;
long long indexSize = 0;
long long fileSize = 0;
for (vector<BSONObj>::const_iterator it(results.begin()), end(results.end()); it != end; ++it) {
const BSONObj& b = *it;
objects += b["objects"].numberLong();
dataSize += b["dataSize"].numberLong();
storageSize += b["storageSize"].numberLong();
numExtents += b["numExtents"].numberLong();
indexes += b["indexes"].numberLong();
indexSize += b["indexSize"].numberLong();
fileSize += b["fileSize"].numberLong();
}
//result.appendNumber( "collections" , ncollections ); //TODO: need to find a good way to get this
output.appendNumber( "objects" , objects );
output.append ( "avgObjSize" , double(dataSize) / double(objects) );
output.appendNumber( "dataSize" , dataSize );
output.appendNumber( "storageSize" , storageSize);
output.appendNumber( "numExtents" , numExtents );
output.appendNumber( "indexes" , indexes );
output.appendNumber( "indexSize" , indexSize );
output.appendNumber( "fileSize" , fileSize );
}
} DBStatsCmdObj;
class DropCmd : public PublicGridCommand {
public:
DropCmd() : PublicGridCommand( "drop" ) {}
bool run(const string& dbName , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string collection = cmdObj.firstElement().valuestrsafe();
string fullns = dbName + "." + collection;
DBConfigPtr conf = grid.getDBConfig( dbName , false );
log() << "DROP: " << fullns << endl;
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
return passthrough( conf , cmdObj , result );
}
ChunkManagerPtr cm = conf->getChunkManager( fullns );
massert( 10418 , "how could chunk manager be null!" , cm );
cm->drop( cm );
uassert( 13512 , "drop collection attempted on non-sharded collection" , conf->removeSharding( fullns ) );
return 1;
}
} dropCmd;
class DropDBCmd : public PublicGridCommand {
public:
DropDBCmd() : PublicGridCommand( "dropDatabase" ) {}
bool run(const string& dbName , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
BSONElement e = cmdObj.firstElement();
if ( ! e.isNumber() || e.number() != 1 ) {
errmsg = "invalid params";
return 0;
}
DBConfigPtr conf = grid.getDBConfig( dbName , false );
log() << "DROP DATABASE: " << dbName << endl;
if ( ! conf ) {
result.append( "info" , "database didn't exist" );
return true;
}
if ( ! conf->dropDatabase( errmsg ) )
return false;
result.append( "dropped" , dbName );
return true;
}
} dropDBCmd;
class RenameCollectionCmd : public PublicGridCommand {
public:
RenameCollectionCmd() : PublicGridCommand( "renameCollection" ) {}
bool run(const string& dbName, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string fullnsFrom = cmdObj.firstElement().valuestrsafe();
string dbNameFrom = nsToDatabase( fullnsFrom.c_str() );
DBConfigPtr confFrom = grid.getDBConfig( dbNameFrom , false );
string fullnsTo = cmdObj["to"].valuestrsafe();
string dbNameTo = nsToDatabase( fullnsTo.c_str() );
DBConfigPtr confTo = grid.getDBConfig( dbNameTo , false );
uassert(13140, "Don't recognize source or target DB", confFrom && confTo);
uassert(13138, "You can't rename a sharded collection", !confFrom->isSharded(fullnsFrom));
uassert(13139, "You can't rename to a sharded collection", !confTo->isSharded(fullnsTo));
const Shard& shardTo = confTo->getShard(fullnsTo);
const Shard& shardFrom = confFrom->getShard(fullnsFrom);
uassert(13137, "Source and destination collections must be on same shard", shardFrom == shardTo);
return adminPassthrough( confFrom , cmdObj , result );
}
} renameCollectionCmd;
class CopyDBCmd : public PublicGridCommand {
public:
CopyDBCmd() : PublicGridCommand( "copydb" ) {}
bool run(const string& dbName, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string todb = cmdObj.getStringField("todb");
uassert(13402, "need a todb argument", !todb.empty());
DBConfigPtr confTo = grid.getDBConfig( todb );
uassert(13398, "cant copy to sharded DB", !confTo->isShardingEnabled());
string fromhost = cmdObj.getStringField("fromhost");
if (!fromhost.empty()) {
return adminPassthrough( confTo , cmdObj , result );
}
else {
string fromdb = cmdObj.getStringField("fromdb");
uassert(13399, "need a fromdb argument", !fromdb.empty());
DBConfigPtr confFrom = grid.getDBConfig( fromdb , false );
uassert(13400, "don't know where source DB is", confFrom);
uassert(13401, "cant copy from sharded DB", !confFrom->isShardingEnabled());
BSONObjBuilder b;
BSONForEach(e, cmdObj) {
if (strcmp(e.fieldName(), "fromhost") != 0)
b.append(e);
}
b.append("fromhost", confFrom->getPrimary().getConnString());
BSONObj fixed = b.obj();
return adminPassthrough( confTo , fixed , result );
}
}
} copyDBCmd;
class CountCmd : public PublicGridCommand {
public:
CountCmd() : PublicGridCommand("count") { }
virtual bool passOptions() const { return true; }
bool run(const string& dbName, BSONObj& cmdObj, int options, string& errmsg, BSONObjBuilder& result, bool) {
string collection = cmdObj.firstElement().valuestrsafe();
string fullns = dbName + "." + collection;
BSONObj filter;
if ( cmdObj["query"].isABSONObj() )
filter = cmdObj["query"].Obj();
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
ShardConnection conn( conf->getPrimary() , fullns );
BSONObj temp;
bool ok = conn->runCommand( dbName , cmdObj , temp, options );
conn.done();
if ( ok ) {
result.append( temp["n"] );
return true;
}
if ( temp["code"].numberInt() != SendStaleConfigCode ) {
errmsg = temp["errmsg"].String();
result.appendElements( temp );
return false;
}
// this collection got sharded
ChunkManagerPtr cm = conf->getChunkManagerIfExists( fullns , true );
if ( ! cm ) {
errmsg = "should be sharded now";
result.append( "root" , temp );
return false;
}
}
long long total = 0;
map<string,long long> shardCounts;
ChunkManagerPtr cm = conf->getChunkManagerIfExists( fullns );
while ( true ) {
if ( ! cm ) {
// probably unsharded now
return run( dbName , cmdObj , options , errmsg , result, false );
}
set<Shard> shards;
cm->getShardsForQuery( shards , filter );
assert( shards.size() );
bool hadToBreak = false;
for (set<Shard>::iterator it=shards.begin(), end=shards.end(); it != end; ++it) {
ShardConnection conn(*it, fullns);
if ( conn.setVersion() ) {
total = 0;
shardCounts.clear();
cm = conf->getChunkManagerIfExists( fullns );
conn.done();
hadToBreak = true;
break;
}
BSONObj temp;
bool ok = conn->runCommand( dbName , BSON( "count" << collection << "query" << filter ) , temp, options );
conn.done();
if ( ok ) {
long long mine = temp["n"].numberLong();
total += mine;
shardCounts[it->getName()] = mine;
continue;
}
if ( SendStaleConfigCode == temp["code"].numberInt() ) {
// my version is old
total = 0;
shardCounts.clear();
cm = conf->getChunkManagerIfExists( fullns , true );
hadToBreak = true;
break;
}
// command failed :(
errmsg = "failed on : " + it->getName();
result.append( "cause" , temp );
return false;
}
if ( ! hadToBreak )
break;
}
total = applySkipLimit( total , cmdObj );
result.appendNumber( "n" , total );
BSONObjBuilder temp( result.subobjStart( "shards" ) );
for ( map<string,long long>::iterator i=shardCounts.begin(); i!=shardCounts.end(); ++i )
temp.appendNumber( i->first , i->second );
temp.done();
return true;
}
} countCmd;
class CollectionStats : public PublicGridCommand {
public:
CollectionStats() : PublicGridCommand("collStats", "collstats") { }
bool run(const string& dbName , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string collection = cmdObj.firstElement().valuestrsafe();
string fullns = dbName + "." + collection;
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
result.appendBool("sharded", false);
result.append( "primary" , conf->getPrimary().getName() );
return passthrough( conf , cmdObj , result);
}
result.appendBool("sharded", true);
ChunkManagerPtr cm = conf->getChunkManager( fullns );
massert( 12594 , "how could chunk manager be null!" , cm );
set<Shard> servers;
cm->getAllShards(servers);
BSONObjBuilder shardStats;
map<string,long long> counts;
map<string,long long> indexSizes;
/*
long long count=0;
long long size=0;
long long storageSize=0;
*/
int nindexes=0;
bool warnedAboutIndexes = false;
for ( set<Shard>::iterator i=servers.begin(); i!=servers.end(); i++ ) {
ScopedDbConnection conn( *i );
BSONObj res;
if ( ! conn->runCommand( dbName , cmdObj , res ) ) {
errmsg = "failed on shard: " + res.toString();
return false;
}
conn.done();
BSONObjIterator j( res );
while ( j.more() ) {
BSONElement e = j.next();
if ( str::equals( e.fieldName() , "ns" ) ||
str::equals( e.fieldName() , "ok" ) ||
str::equals( e.fieldName() , "avgObjSize" ) ||
str::equals( e.fieldName() , "lastExtentSize" ) ||
str::equals( e.fieldName() , "paddingFactor" ) ) {
continue;
}
else if ( str::equals( e.fieldName() , "count" ) ||
str::equals( e.fieldName() , "size" ) ||
str::equals( e.fieldName() , "storageSize" ) ||
str::equals( e.fieldName() , "numExtents" ) ||
str::equals( e.fieldName() , "totalIndexSize" ) ) {
counts[e.fieldName()] += e.numberLong();
}
else if ( str::equals( e.fieldName() , "indexSizes" ) ) {
BSONObjIterator k( e.Obj() );
while ( k.more() ) {
BSONElement temp = k.next();
indexSizes[temp.fieldName()] += temp.numberLong();
}
}
else if ( str::equals( e.fieldName() , "flags" ) ) {
if ( ! result.hasField( e.fieldName() ) )
result.append( e );
}
else if ( str::equals( e.fieldName() , "nindexes" ) ) {
int myIndexes = e.numberInt();
if ( nindexes == 0 ) {
nindexes = myIndexes;
}
else if ( nindexes == myIndexes ) {
// no-op
}
else {
// hopefully this means we're building an index
if ( myIndexes > nindexes )
nindexes = myIndexes;
if ( ! warnedAboutIndexes ) {
result.append( "warning" , "indexes don't all match - ok if ensureIndex is running" );
warnedAboutIndexes = true;
}
}
}
else {
warning() << "mongos collstats doesn't know about: " << e.fieldName() << endl;
}
}
shardStats.append(i->getName(), res);
}
result.append("ns", fullns);
for ( map<string,long long>::iterator i=counts.begin(); i!=counts.end(); ++i )
result.appendNumber( i->first , i->second );
{
BSONObjBuilder ib( result.subobjStart( "indexSizes" ) );
for ( map<string,long long>::iterator i=indexSizes.begin(); i!=indexSizes.end(); ++i )
ib.appendNumber( i->first , i->second );
ib.done();
}
if ( counts["count"] > 0 )
result.append("avgObjSize", (double)counts["size"] / (double)counts["count"] );
else
result.append( "avgObjSize", 0.0 );
result.append("nindexes", nindexes);
result.append("nchunks", cm->numChunks());
result.append("shards", shardStats.obj());
return true;
}
} collectionStatsCmd;
class FindAndModifyCmd : public PublicGridCommand {
public:
FindAndModifyCmd() : PublicGridCommand("findAndModify", "findandmodify") { }
bool run(const string& dbName, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string collection = cmdObj.firstElement().valuestrsafe();
string fullns = dbName + "." + collection;
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
return passthrough( conf , cmdObj , result);
}
ChunkManagerPtr cm = conf->getChunkManager( fullns );
massert( 13002 , "shard internal error chunk manager should never be null" , cm );
BSONObj filter = cmdObj.getObjectField("query");
uassert(13343, "query for sharded findAndModify must have shardkey", cm->hasShardKey(filter));
//TODO with upsert consider tracking for splits
ChunkPtr chunk = cm->findChunk(filter);
ShardConnection conn( chunk->getShard() , fullns );
BSONObj res;
bool ok = conn->runCommand( conf->getName() , cmdObj , res );
conn.done();
if (!ok && res.getIntField("code") == RecvStaleConfigCode) { // code for RecvStaleConfigException
throw RecvStaleConfigException(fullns, "FindAndModify"); // Command code traps this and re-runs
}
result.appendElements(res);
return ok;
}
} findAndModifyCmd;
class DataSizeCmd : public PublicGridCommand {
public:
DataSizeCmd() : PublicGridCommand("dataSize", "datasize") { }
bool run(const string& dbName, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string fullns = cmdObj.firstElement().String();
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
return passthrough( conf , cmdObj , result);
}
ChunkManagerPtr cm = conf->getChunkManager( fullns );
massert( 13407 , "how could chunk manager be null!" , cm );
BSONObj min = cmdObj.getObjectField( "min" );
BSONObj max = cmdObj.getObjectField( "max" );
BSONObj keyPattern = cmdObj.getObjectField( "keyPattern" );
uassert(13408, "keyPattern must equal shard key", cm->getShardKey().key() == keyPattern);
// yes these are doubles...
double size = 0;
double numObjects = 0;
int millis = 0;
set<Shard> shards;
cm->getShardsForRange(shards, min, max);
for ( set<Shard>::iterator i=shards.begin(), end=shards.end() ; i != end; ++i ) {
ScopedDbConnection conn( *i );
BSONObj res;
bool ok = conn->runCommand( conf->getName() , cmdObj , res );
conn.done();
if ( ! ok ) {
result.appendElements( res );
return false;
}
size += res["size"].number();
numObjects += res["numObjects"].number();
millis += res["millis"].numberInt();
}
result.append( "size", size );
result.append( "numObjects" , numObjects );
result.append( "millis" , millis );
return true;
}
} DataSizeCmd;
class ConvertToCappedCmd : public NotAllowedOnShardedCollectionCmd {
public:
ConvertToCappedCmd() : NotAllowedOnShardedCollectionCmd("convertToCapped") {}
virtual string getFullNS( const string& dbName , const BSONObj& cmdObj ) {
return dbName + "." + cmdObj.firstElement().valuestrsafe();
}
} convertToCappedCmd;
class GroupCmd : public NotAllowedOnShardedCollectionCmd {
public:
GroupCmd() : NotAllowedOnShardedCollectionCmd("group") {}
virtual bool passOptions() const { return true; }
virtual string getFullNS( const string& dbName , const BSONObj& cmdObj ) {
return dbName + "." + cmdObj.firstElement().embeddedObjectUserCheck()["ns"].valuestrsafe();
}
} groupCmd;
class DistinctCmd : public PublicGridCommand {
public:
DistinctCmd() : PublicGridCommand("distinct") {}
virtual void help( stringstream &help ) const {
help << "{ distinct : 'collection name' , key : 'a.b' , query : {} }";
}
virtual bool passOptions() const { return true; }
bool run(const string& dbName , BSONObj& cmdObj, int options, string& errmsg, BSONObjBuilder& result, bool) {
string collection = cmdObj.firstElement().valuestrsafe();
string fullns = dbName + "." + collection;
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
return passthrough( conf , cmdObj , options, result );
}
ChunkManagerPtr cm = conf->getChunkManager( fullns );
massert( 10420 , "how could chunk manager be null!" , cm );
BSONObj query = getQuery(cmdObj);
set<Shard> shards;
cm->getShardsForQuery(shards, query);
set<BSONObj,BSONObjCmp> all;
int size = 32;
for ( set<Shard>::iterator i=shards.begin(), end=shards.end() ; i != end; ++i ) {
ShardConnection conn( *i , fullns );
BSONObj res;
bool ok = conn->runCommand( conf->getName() , cmdObj , res, options );
conn.done();
if ( ! ok ) {
result.appendElements( res );
return false;
}
BSONObjIterator it( res["values"].embeddedObject() );
while ( it.more() ) {
BSONElement nxt = it.next();
BSONObjBuilder temp(32);
temp.appendAs( nxt , "" );
all.insert( temp.obj() );
}
}
BSONObjBuilder b( size );
int n=0;
for ( set<BSONObj,BSONObjCmp>::iterator i = all.begin() ; i != all.end(); i++ ) {
b.appendAs( i->firstElement() , b.numStr( n++ ) );
}
result.appendArray( "values" , b.obj() );
return true;
}
} disinctCmd;
class FileMD5Cmd : public PublicGridCommand {
public:
FileMD5Cmd() : PublicGridCommand("filemd5") {}
virtual void help( stringstream &help ) const {
help << " example: { filemd5 : ObjectId(aaaaaaa) , root : \"fs\" }";
}
bool run(const string& dbName , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
string fullns = dbName;
fullns += ".";
{
string root = cmdObj.getStringField( "root" );
if ( root.size() == 0 )
root = "fs";
fullns += root;
}
fullns += ".chunks";
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
return passthrough( conf , cmdObj , result );
}
ChunkManagerPtr cm = conf->getChunkManager( fullns );
massert( 13091 , "how could chunk manager be null!" , cm );
uassert( 13092 , "GridFS chunks collection can only be sharded on files_id", cm->getShardKey().key() == BSON("files_id" << 1));
ChunkPtr chunk = cm->findChunk( BSON("files_id" << cmdObj.firstElement()) );
ShardConnection conn( chunk->getShard() , fullns );
BSONObj res;
bool ok = conn->runCommand( conf->getName() , cmdObj , res );
conn.done();
result.appendElements(res);
return ok;
}
} fileMD5Cmd;
class Geo2dFindNearCmd : public PublicGridCommand {
public:
Geo2dFindNearCmd() : PublicGridCommand( "geoNear" ) {}
void help(stringstream& h) const { h << "http://www.mongodb.org/display/DOCS/Geospatial+Indexing#GeospatialIndexing-geoNearCommand"; }
virtual bool passOptions() const { return true; }
bool run(const string& dbName , BSONObj& cmdObj, int options, string& errmsg, BSONObjBuilder& result, bool) {
string collection = cmdObj.firstElement().valuestrsafe();
string fullns = dbName + "." + collection;
DBConfigPtr conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ) {
return passthrough( conf , cmdObj , options, result );
}
ChunkManagerPtr cm = conf->getChunkManager( fullns );
massert( 13500 , "how could chunk manager be null!" , cm );
BSONObj query = getQuery(cmdObj);
set<Shard> shards;
cm->getShardsForQuery(shards, query);
int limit = 100;
if (cmdObj["num"].isNumber())
limit = cmdObj["num"].numberInt();
list< shared_ptr<Future::CommandResult> > futures;
BSONArrayBuilder shardArray;
for ( set<Shard>::const_iterator i=shards.begin(), end=shards.end() ; i != end ; i++ ) {
futures.push_back( Future::spawnCommand( i->getConnString() , dbName , cmdObj, options ) );
shardArray.append(i->getName());
}
multimap<double, BSONObj> results; // TODO: maybe use merge-sort instead
string nearStr;
double time = 0;
double btreelocs = 0;
double nscanned = 0;
double objectsLoaded = 0;
for ( list< shared_ptr<Future::CommandResult> >::iterator i=futures.begin(); i!=futures.end(); i++ ) {
shared_ptr<Future::CommandResult> res = *i;
if ( ! res->join() ) {
errmsg = res->result()["errmsg"].String();
return false;
}
nearStr = res->result()["near"].String();
time += res->result()["stats"]["time"].Number();
btreelocs += res->result()["stats"]["btreelocs"].Number();
nscanned += res->result()["stats"]["nscanned"].Number();
objectsLoaded += res->result()["stats"]["objectsLoaded"].Number();
BSONForEach(obj, res->result()["results"].embeddedObject()) {
results.insert(make_pair(obj["dis"].Number(), obj.embeddedObject().getOwned()));
}
// TODO: maybe shrink results if size() > limit
}
result.append("ns" , fullns);
result.append("near", nearStr);
int outCount = 0;
double totalDistance = 0;
double maxDistance = 0;
{
BSONArrayBuilder sub (result.subarrayStart("results"));
for (multimap<double, BSONObj>::const_iterator it(results.begin()), end(results.end()); it!= end && outCount < limit; ++it, ++outCount) {
totalDistance += it->first;
maxDistance = it->first; // guaranteed to be highest so far
sub.append(it->second);
}
sub.done();
}
{
BSONObjBuilder sub (result.subobjStart("stats"));
sub.append("time", time);
sub.append("btreelocs", btreelocs);
sub.append("nscanned", nscanned);
sub.append("objectsLoaded", objectsLoaded);
sub.append("avgDistance", totalDistance / outCount);
sub.append("maxDistance", maxDistance);
sub.append("shards", shardArray.arr());
sub.done();
}
return true;
}
} geo2dFindNearCmd;
class MRCmd : public PublicGridCommand {
public:
AtomicUInt JOB_NUMBER;
MRCmd() : PublicGridCommand( "mapreduce" ) {}
string getTmpName( const string& coll ) {
stringstream ss;
ss << "tmp.mrs." << coll << "_" << time(0) << "_" << JOB_NUMBER++;
return ss.str();
}
BSONObj fixForShards( const BSONObj& orig , const string& output, BSONObj& customOut , string& badShardedField ) {
BSONObjBuilder b;
BSONObjIterator i( orig );
while ( i.more() ) {
BSONElement e = i.next();
string fn = e.fieldName();
if ( fn == "map" ||
fn == "mapreduce" ||
fn == "mapparams" ||
fn == "reduce" ||
fn == "query" ||
fn == "sort" ||
fn == "scope" ||
fn == "verbose" ) {
b.append( e );
}
else if ( fn == "out" ||
fn == "finalize" ) {
// we don't want to copy these
if (fn == "out" && e.type() == Object) {
// check if there is a custom output
BSONObj out = e.embeddedObject();
// if (out.hasField("db"))
customOut = out;
}
}
else {
badShardedField = fn;
return BSONObj();
}
}
b.append( "out" , output );
return b.obj();
}
ChunkPtr insertSharded( ChunkManagerPtr manager, const char* ns, BSONObj& o, int flags, bool safe ) {
// note here, the MR output process requires no splitting / migration during process, hence StaleConfigException should not happen
Strategy* s = SHARDED;
ChunkPtr c = manager->findChunk( o );
LOG(4) << " server:" << c->getShard().toString() << " " << o << endl;
s->insert( c->getShard() , ns , o , flags, safe);
return c;
}
bool run(const string& dbName , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
return run( dbName, cmdObj, errmsg, result, 0 );
}
bool run(const string& dbName , BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, int retry ) {
Timer t;
string collection = cmdObj.firstElement().valuestrsafe();
string fullns = dbName + "." + collection;
const string shardedOutputCollection = getTmpName( collection );
string badShardedField;
BSONObj customOut;
BSONObj shardedCommand = fixForShards( cmdObj , shardedOutputCollection, customOut , badShardedField );
bool customOutDB = customOut.hasField( "db" );
// Abort after two retries, m/r is an expensive operation