Details
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Bug
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Resolution: Done
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Major - P3
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2.8.0-rc5
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None
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Fully Compatible
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ALL
Description
As part of SERVER-15614, lock stats were re-introduced to db.currentOp().
The idea is to restore this information which is important for MMAPv1 diagnostics and included timeAcquiringMicros and timeLockedMicros.
However, the whole lock mgr state is dumped into each operation, which vastly expands the size of the returned document with unhelpful information.
> db.currentOp()
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{
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"inprog" : [
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{
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"desc" : "conn3",
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"threadId" : "0x299dba0",
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"connectionId" : 3,
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"opid" : 192443,
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"active" : false,
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"op" : "insert",
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"ns" : "a.a",
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"insert" : {
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"_id" : ObjectId("54c48a8fb8589b638ccabd8c"),
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"x" : 64121
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},
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"client" : "127.0.0.1:38982",
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"numYields" : 0,
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"locks" : {
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"Global" : "w",
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"MMAPV1Journal" : "w",
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"Database" : "w",
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"Collection" : "W"
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},
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"waitingForLock" : false,
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"lockStats" : {
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"Global" : {
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"acquireCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(64122),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"acquireWaitCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"timeAcquiringMicros" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"deadlockCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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}
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},
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"MMAPV1Journal" : {
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"acquireCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(128244),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"acquireWaitCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(90),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"timeAcquiringMicros" : {
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"r" : NumberLong(0),
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"w" : NumberLong(47716),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"deadlockCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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}
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},
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"Database" : {
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"acquireCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(64122),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"acquireWaitCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"timeAcquiringMicros" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"deadlockCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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}
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},
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"Collection" : {
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"acquireCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(64122)
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},
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"acquireWaitCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"timeAcquiringMicros" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"deadlockCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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}
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},
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"Metadata" : {
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"acquireCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"acquireWaitCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"timeAcquiringMicros" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"deadlockCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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}
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},
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"oplog" : {
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"acquireCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"acquireWaitCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"timeAcquiringMicros" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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},
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"deadlockCount" : {
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"r" : NumberLong(0),
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"w" : NumberLong(0),
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"R" : NumberLong(0),
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"W" : NumberLong(0)
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}
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}
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}
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}
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]
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}
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