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// @file shard.h
/**
* 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/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#pragma once
#include "mongo/pch.h"
#include "mongo/client/connpool.h"
namespace mongo {
class ShardConnection;
class ShardStatus;
/*
* A "shard" one partition of the overall database (and a replica set typically).
*/
class Shard {
public:
Shard()
: _name("") , _addr("") , _maxSizeMB(0) , _isDraining(false) {
}
Shard(const std::string& name,
const std::string& addr,
long long maxSizeMB,
bool isDraining,
const BSONArray& tags);
Shard(const std::string& name,
const ConnectionString& connStr,
long long maxSizeMB,
bool isDraining,
const std::set<std::string>& tags);
Shard( const std::string& ident ) {
reset( ident );
}
Shard(const Shard& other):
_name(other._name),
_addr(other._addr),
_cs(other._cs),
_maxSizeMB(other._maxSizeMB),
_isDraining(other._isDraining),
_tags(other._tags) {
}
static Shard make( const std::string& ident ) {
Shard s;
s.reset( ident );
return s;
}
static Shard findIfExists( const std::string& shardName );
/**
* @param ident either name or address
*/
void reset( const std::string& ident );
ConnectionString getAddress() const { return _cs; }
std::string getName() const {
verify( _name.size() );
return _name;
}
std::string getConnString() const {
verify( _addr.size() );
return _addr;
}
long long getMaxSizeMB() const {
return _maxSizeMB;
}
bool isDraining() const {
return _isDraining;
}
std::string toString() const {
return _name + ":" + _addr;
}
friend std::ostream& operator << (std::ostream& out, const Shard& s) {
return (out << s.toString());
}
bool operator==( const Shard& s ) const {
if ( _name != s._name )
return false;
return _cs.sameLogicalEndpoint( s._cs );
}
bool operator!=( const Shard& s ) const {
return ! ( *this == s );
}
bool operator==( const std::string& s ) const {
return _name == s || _addr == s;
}
bool operator!=( const std::string& s ) const {
return _name != s && _addr != s;
}
bool operator<(const Shard& o) const {
return _name < o._name;
}
bool ok() const { return _addr.size() > 0; }
// Set internal to true to run the command with internal authentication privileges.
BSONObj runCommand( const std::string& db , const std::string& simple ) const {
return runCommand( db , BSON( simple << 1 ) );
}
BSONObj runCommand( const std::string& db , const BSONObj& cmd ) const ;
ShardStatus getStatus() const ;
/**
* mostly for replica set
* retursn true if node is the shard
* of if the replica set contains node
*/
bool containsNode( const std::string& node ) const;
const std::set<std::string>& tags() const { return _tags; }
static void getAllShards( std::vector<Shard>& all );
static void printShardInfo( std::ostream& out );
static Shard lookupRSName( const std::string& name);
/**
* @parm current - shard where the chunk/database currently lives in
* @return the currently emptiest shard, if best then current, or EMPTY
*/
static Shard pick( const Shard& current = EMPTY );
static void reloadShardInfo();
static void removeShard( const std::string& name );
static bool isAShardNode( const std::string& ident );
static Shard EMPTY;
static void installShard(const std::string& name, const Shard& shard);
private:
void _setAddr( const std::string& addr );
std::string _name;
std::string _addr;
ConnectionString _cs;
long long _maxSizeMB; // in MBytes, 0 is unlimited
bool _isDraining; // shard is currently being removed
std::set<std::string> _tags;
};
typedef shared_ptr<Shard> ShardPtr;
class ShardStatus {
public:
ShardStatus(const Shard& shard, long long dataSizeBytes, const std::string& version);
friend std::ostream& operator << (std::ostream& out, const ShardStatus& s) {
out << s.toString();
return out;
}
std::string toString() const {
std::stringstream ss;
ss << "shard: " << _shard
<< " dataSizeBytes: " << _dataSizeBytes
<< " version: " << _mongoVersion;
return ss.str();
}
bool operator<( const ShardStatus& other ) const {
return _dataSizeBytes < other._dataSizeBytes;
}
Shard shard() const {
return _shard;
}
long long dataSizeBytes() const {
return _dataSizeBytes;
}
std::string mongoVersion() const {
return _mongoVersion;
}
private:
Shard _shard;
long long _dataSizeBytes;
std::string _mongoVersion;
};
class ChunkManager;
typedef shared_ptr<const ChunkManager> ChunkManagerPtr;
class ShardConnection : public AScopedConnection {
public:
ShardConnection( const Shard * s , const std::string& ns, ChunkManagerPtr manager = ChunkManagerPtr() );
ShardConnection( const Shard& s , const std::string& ns, ChunkManagerPtr manager = ChunkManagerPtr() );
ShardConnection( const std::string& addr , const std::string& ns, ChunkManagerPtr manager = ChunkManagerPtr() );
~ShardConnection();
void done();
void kill();
DBClientBase& conn() {
_finishInit();
verify( _conn );
return *_conn;
}
DBClientBase* operator->() {
_finishInit();
verify( _conn );
return _conn;
}
DBClientBase* get() {
_finishInit();
verify( _conn );
return _conn;
}
/**
* @return the connection object underneath without setting the shard version.
* @throws AssertionException if _conn is uninitialized.
*/
DBClientBase* getRawConn() const {
verify( _conn );
return _conn;
}
std::string getHost() const {
return _addr;
}
std::string getNS() const {
return _ns;
}
ChunkManagerPtr getManager() const {
return _manager;
}
bool setVersion() {
_finishInit();
return _setVersion;
}
static void sync();
void donotCheckVersion() {
_setVersion = false;
_finishedInit = true;
}
bool ok() const { return _conn != NULL; }
/** checks all of my thread local connections for the version of this ns */
static void checkMyConnectionVersions( const std::string & ns );
/**
* Returns all the current sharded connections to the pool.
* Note: This is *dangerous* if we have GLE state.
*/
static void releaseMyConnections();
/**
* Clears all connections in the sharded pool, including connections in the
* thread local storage pool of the current thread.
*/
static void clearPool();
/**
* Forgets a namespace to prevent future versioning.
*/
static void forgetNS( const std::string& ns );
private:
void _init();
void _finishInit();
bool _finishedInit;
std::string _addr;
std::string _ns;
ChunkManagerPtr _manager;
DBClientBase* _conn;
bool _setVersion;
};
extern DBConnectionPool shardConnectionPool;
class ShardingConnectionHook : public DBConnectionHook {
public:
ShardingConnectionHook( bool shardedConnections )
: _shardedConnections( shardedConnections ) {
}
virtual void onCreate( DBClientBase * conn );
virtual void onDestroy( DBClientBase * conn );
virtual void onRelease(DBClientBase* conn);
bool _shardedConnections;
};
}
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