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Type:
Bug
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Resolution: Done
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Priority:
Major - P3
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None
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Affects Version/s: 2.2.3
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Component/s: Performance, Sharding
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None
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Environment:Linux 2.6.38-2-amd64
90 mongos linked to one cluster with 4 shards.
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Linux
Hi,
By looking into the log, I found that several connections will request to split a same chunk a the same time, which may affect the performance.
log:
Tue Apr 9 09:48:45 [conn57348] request split points lookup for chunk tw2_log_10191.gm_quest { : 387362153 } -->> { : 403798381 } Tue Apr 9 09:48:45 [conn57347] request split points lookup for chunk tw2_log_10191.gm_quest { : 387362153 } -->> { : 403798381 } Tue Apr 9 09:48:45 [conn57646] request split points lookup for chunk tw2_log_10191.gm_quest { : 387362153 } -->> { : 403798381 } Tue Apr 9 09:48:45 [conn57648] request split points lookup for chunk tw2_log_10191.gm_quest { : 387362153 } -->> { : 403798381 } Tue Apr 9 09:48:45 [conn57647] request split points lookup for chunk tw2_log_10191.gm_quest { : 387362153 } -->> { : 403798381 } Tue Apr 9 09:48:46 [conn57348] warning: Finding the split vector for tw2_log_10191.gm_quest over { _sk: 1 } keyCount: 203360 numSplits: 1 lookedAt: 61189 took 1246ms Tue Apr 9 09:48:46 [conn57348] command admin.$cmd command: { splitVector: "tw2_log_10191.gm_quest", keyPattern: { _sk: 1 }, min: { _sk: 387362153 }, max: { _sk: 403798381 }, maxChunkSizeBytes: 67108864, maxSplitPoints: 2, maxChunkObjects: 250000, $auth: { local: { __system: 2 } } } ntoreturn:1 keyUpdates:0 numYields: 301 locks(micros) r:2263610 reslen:70 1247ms Tue Apr 9 09:48:46 [conn57647] warning: Finding the split vector for tw2_log_10191.gm_quest over { _sk: 1 } keyCount: 203360 numSplits: 1 lookedAt: 61191 took 1085ms Tue Apr 9 09:48:46 [conn57647] command admin.$cmd command: { splitVector: "tw2_log_10191.gm_quest", keyPattern: { _sk: 1 }, min: { _sk: 387362153 }, max: { _sk: 403798381 }, maxChunkSizeBytes: 67108864, maxSplitPoints: 2, maxChunkObjects: 250000, $auth: { local: { __system: 2 } } } ntoreturn:1 keyUpdates:0 numYields: 32 locks(micros) r:2150012 reslen:70 1085ms Tue Apr 9 09:48:46 [conn57646] warning: Finding the split vector for tw2_log_10191.gm_quest over { _sk: 1 } keyCount: 203360 numSplits: 1 lookedAt: 61193 took 1109ms Tue Apr 9 09:48:46 [conn57646] command admin.$cmd command: { splitVector: "tw2_log_10191.gm_quest", keyPattern: { _sk: 1 }, min: { _sk: 387362153 }, max: { _sk: 403798381 }, maxChunkSizeBytes: 67108864, maxSplitPoints: 2, maxChunkObjects: 250000, $auth: { local: { __system: 2 } } } ntoreturn:1 keyUpdates:0 numYields: 33 locks(micros) r:2188370 reslen:70 1109ms Tue Apr 9 09:48:46 [conn57648] warning: Finding the split vector for tw2_log_10191.gm_quest over { _sk: 1 } keyCount: 203360 numSplits: 1 lookedAt: 61196 took 1118ms Tue Apr 9 09:48:46 [conn57648] command admin.$cmd command: { splitVector: "tw2_log_10191.gm_quest", keyPattern: { _sk: 1 }, min: { _sk: 387362153 }, max: { _sk: 403798381 }, maxChunkSizeBytes: 67108864, maxSplitPoints: 2, maxChunkObjects: 250000, $auth: { local: { __system: 2 } } } ntoreturn:1 keyUpdates:0 numYields: 22 locks(micros) r:2220804 reslen:70 1118ms Tue Apr 9 09:48:46 [conn57347] warning: Finding the split vector for tw2_log_10191.gm_quest over { _sk: 1 } keyCount: 203360 numSplits: 1 lookedAt: 61202 took 1138ms Tue Apr 9 09:48:46 [conn57347] command admin.$cmd command: { splitVector: "tw2_log_10191.gm_quest", keyPattern: { _sk: 1 }, min: { _sk: 387362153 }, max: { _sk: 403798381 }, maxChunkSizeBytes: 67108864, maxSplitPoints: 2, maxChunkObjects: 250000, $auth: { local: { __system: 2 } } } ntoreturn:1 keyUpdates:0 numYields: 102 locks(micros) r:2260997 reslen:70 1138ms
- related to
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SERVER-9287 Decision to split chunk should happen on shard mongod, not on mongos
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- Closed
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