mongo::BalancerPolicy Class Reference

#include <balancer_policy.h>

List of all members.

Classes
struct	ChunkInfo
Public Types
typedef map< string, vector < BSONObj > >	ShardToChunksMap
typedef map< string, BSONObj >	ShardToLimitsMap
Static Public Member Functions
static ChunkInfo *	balance (const string &ns, const ShardToLimitsMap &shardToLimitsMap, const ShardToChunksMap &shardToChunksMap, int balancedLastTime)
static bool	hasOpsQueued (BSONObj shardLimits)
static bool	isDraining (BSONObj shardLimits)
static bool	isSizeMaxed (BSONObj shardLimits)
static BSONObj	pickChunk (const vector< BSONObj > &from, const vector< BSONObj > &to)
Private Types
typedef ShardToChunksMap::const_iterator	ShardToChunksIter
typedef ShardToLimitsMap::const_iterator	ShardToLimitsIter

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Detailed Description

Definition at line 26 of file balancer_policy.h.

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Member Typedef Documentation

typedef ShardToChunksMap::const_iterator mongo::BalancerPolicy::ShardToChunksIter [private]

Definition at line 72 of file balancer_policy.h.

typedef map< string,vector<BSONObj> > mongo::BalancerPolicy::ShardToChunksMap

Definition at line 44 of file balancer_policy.h.

typedef ShardToLimitsMap::const_iterator mongo::BalancerPolicy::ShardToLimitsIter [private]

Definition at line 73 of file balancer_policy.h.

typedef map< string,BSONObj > mongo::BalancerPolicy::ShardToLimitsMap

Returns a suggested chunk to move whithin a collection's shards, given information about space usage and number of chunks for that collection. If the policy doesn't recommend moving, it returns NULL.

Parameters:

	ns	is the collections namepace.
	shardLimitMap	is a map from shardId to an object that describes (for now) space cap and usage. E.g.: { "maxSize" : <size_in_MB> , "usedSize" : <size_in_MB> }.
	shardToChunksMap	is a map from shardId to chunks that live there. A chunk's format is { }.
	balancedLastTime	is the number of chunks effectively moved in the last round.

Returns:

NULL or ChunkInfo of the best move to make towards balacing the collection.

Definition at line 28 of file balancer_policy.h.

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Member Function Documentation

static ChunkInfo* mongo::BalancerPolicy::balance	(	const string &	ns,
		const ShardToLimitsMap &	shardToLimitsMap,
		const ShardToChunksMap &	shardToChunksMap,
		int	balancedLastTime
	)			[static]

static bool mongo::BalancerPolicy::hasOpsQueued

(

BSONObj

shardLimits

)

[static]

Returns true if a shard currently has operations in any of its writeback queues

static bool mongo::BalancerPolicy::isDraining

(

BSONObj

shardLimits

)

[static]

Returns true if 'shardLimist' contains a field "draining". Expects the optional field "isDraining" on 'shrdLimits'.

static bool mongo::BalancerPolicy::isSizeMaxed

(

BSONObj

shardLimits

)

[static]

Returns true if a shard cannot receive any new chunks bacause it reache 'shardLimits'. Expects the optional fields "maxSize", can in size in MB, and "usedSize", currently used size in MB, on 'shardLimits'.

static BSONObj mongo::BalancerPolicy::pickChunk	(	const vector< BSONObj > &	from,
		const vector< BSONObj > &	to
	)			[static]

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The documentation for this class was generated from the following file:

• balancer_policy.h