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Type:
Bug
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Resolution: Works as Designed
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Priority:
Major - P3
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None
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Affects Version/s: 3.4.10
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Component/s: Performance, Sharding
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None
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ALL
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3
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None
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None
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None
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System environment
System: CentOS release 6.6
Kernel: 2.6.32-504.el6.x86_64
Memory: 256G
Disk: SSD-PCIE
File System: xfs
mongo version: 3.4.10
The config server has three members in my cluster, one of members that is secondary shows some slow queries in logs file. When I executed sh.disableAutoSplit(), there was more slow queries on this secondary's log. And the ops of all members have risen to 2k/s.
2017-12-19T20:14:12.749+0800 I COMMAND [conn4490] command config.settings command: find { find: "settings", filter: { _id: "autosplit" }, readConcern: { level: "majority",
afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nretur
ned:1 reslen:391 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4997ms
2017-12-19T20:14:12.749+0800 I COMMAND [conn4585] command config.settings command: find { find: "settings", filter: { _id: "balancer" }, readConcern: { level: "majority",
afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturn
ed:1 reslen:404 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4997ms
2017-12-19T20:14:12.749+0800 I COMMAND [conn4602] command config.settings command: find { find: "settings", filter: { _id: "chunksize" }, readConcern: { level: "majority",
afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nretur
ned:1 reslen:392 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4989ms
2017-12-19T20:14:12.749+0800 I COMMAND [conn4583] command config.settings command: find { find: "settings", filter: { _id: "balancer" }, readConcern: { level: "majority",
afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturn
ed:1 reslen:404 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4989ms
2017-12-19T20:14:12.749+0800 I COMMAND [conn4580] command config.settings command: find { find: "settings", filter: { _id: "chunksize" }, readConcern: { level: "majority",
afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nretur
ned:1 reslen:392 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4994ms
2017-12-19T20:14:12.749+0800 I COMMAND [conn4545] command config.settings command: find { find: "settings", filter: { _id: "autosplit" }, readConcern: { level: "majority",
afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nretur
ned:1 reslen:391 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4997ms
2017-12-19T20:14:12.749+0800 I COMMAND [conn4600] command config.settings command: find { find: "settings", filter: { _id: "balancer" }, readConcern: { level: "majority",
afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturn
ed:1 reslen:404 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4963ms
2017-12-19T20:14:12.749+0800 I COMMAND [conn4451] command config.settings command: find { find: "settings", filter: { _id: "balancer" }, readConcern: { level: "majority",
afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturn
ed:1 reslen:404 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4988ms
2017-12-19T20:14:12.749+0800 I COMMAND [conn4572] command config.settings command: find { find: "settings", filter: { _id: "chunksize" }, readConcern: { level: "majority",
afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nretur
ned:1 reslen:392 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4976ms
2017-12-19T20:14:12.749+0800 I COMMAND [conn4387] command config.settings command: find { find: "settings", filter: { _id: "balancer" }, readConcern: { level: "majority",
afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturn
ed:1 reslen:404 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4908ms
2017-12-19T20:14:12.749+0800 I COMMAND [conn4578] command config.settings command: find { find: "settings", filter: { _id: "chunksize" }, readConcern: { level: "majority",
afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nretur
ned:1 reslen:392 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4974ms
2017-12-19T20:14:12.749+0800 I COMMAND [conn4607] command config.settings command: find { find: "settings", filter: { _id: "autosplit" }, readConcern: { level: "majority",
afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nretur
ned:1 reslen:391 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4990ms
