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If you know why this problem occurred, please add a suitable Cause for it. 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If you know why this problem occurred, please add a suitable Cause for it. ( http://cv.jenkins.couchbase.com/job/kv-engine-cv-perf/12585/ )\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine-threadsanitizer-master/13497/ : ABORTED\n\nTimeout of a CTest test  24/179 Test  #23: ep-engine_ep_unit_tests ......................................................} ( http://cv.jenkins.couchbase.com/job/kv_engine-threadsanitizer-master/13497/ )\n\nFailure of a CTest test  25/179 Test  #25: ep_testsuite.value_eviction.comp_passive ..................................... ( http://cv.jenkins.couchbase.com/job/kv_engine-threadsanitizer-master/13497/ )\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine-windows-master/22539/ : ABORTED\n\nTimeout of a CTest test  24/184 Test  #23: ep-engine_ep_unit_tests ......................................................} ( http://cv.jenkins.couchbase.com/job/kv_engine-windows-master/22539/ )\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine-linux-master-CE/3306/ : ABORTED\n\nTimeout of a CTest test  27/200 Test  #26: ep-engine_ep_unit_tests ......................................................} ( http://cv.jenkins.couchbase.com/job/kv_engine-linux-master-CE/3306/ )\n\nFailure of a CTest test  28/200 Test  #28: ep_testsuite.value_eviction.comp_passive ..................................... ( http://cv.jenkins.couchbase.com/job/kv_engine-linux-master-CE/3306/ )\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine-linux-master/21649/ : ABORTED\n\nTimeout of a CTest test  27/200 Test  #26: ep-engine_ep_unit_tests ......................................................} ( http://cv.jenkins.couchbase.com/job/kv_engine-linux-master/21649/ )\n\nFailure of a CTest test  28/200 Test  #28: ep_testsuite.value_eviction.comp_passive ..................................... ( http://cv.jenkins.couchbase.com/job/kv_engine-linux-master/21649/ )\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine.ASan-UBSan/job/master/6235/ : FAILURE\n\nTimeout of a CTest test [2019-08-13T14:19:35.198Z]  26/181 Test  #25: ep-engine_ep_unit_tests ......................................................} ( http://cv.jenkins.couchbase.com/job/kv_engine.ASan-UBSan/job/master/6235/ )\n\nFailure of a CTest test [2019-08-13T14:24:56.796Z]  27/181 Test  #27: ep_testsuite.value_eviction.comp_passive ..................................... ( http://cv.jenkins.couchbase.com/job/kv_engine.ASan-UBSan/job/master/6235/ )\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine-clang_format/20263/ : SUCCESS\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine-clang_analyzer-master/19281/ : SUCCESS","accounts_in_message":[],"_revision_number":4},{"id":"8e72fd04a05262c7344837087cb1b25786624b0f","tag":"autogenerated:gerrit:newPatchSet","author":{"_account_id":1000966,"name":"Dave Rigby","email":"daver@couchbase.com","username":"drigby","avatars":[{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d32","height":32},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d56","height":56},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d100","height":100},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d120","height":120}]},"date":"2019-08-15 16:30:59.000000000","message":"Uploaded patch set 5.","accounts_in_message":[],"_revision_number":5},{"id":"ab941d3ad89abade51a24348bb8a9c080d61a292","tag":"autogenerated:jenkins-gerrit-trigger","author":{"_account_id":1000011,"name":"Build Bot","email":"build@couchbase.com","username":"buildbot","avatars":[{"url":"https://www.gravatar.com/avatar/0ba35a43c05d6329d9b2136bab05a733.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d32","height":32},{"url":"https://www.gravatar.com/avatar/0ba35a43c05d6329d9b2136bab05a733.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d56","height":56},{"url":"https://www.gravatar.com/avatar/0ba35a43c05d6329d9b2136bab05a733.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d100","height":100},{"url":"https://www.gravatar.com/avatar/0ba35a43c05d6329d9b2136bab05a733.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d120","height":120}],"tags":["SERVICE_USER"]},"date":"2019-08-15 22:01:10.000000000","message":"Patch Set 5: Verified-1\n\nBuild Failed \n\nhttp://cv.jenkins.couchbase.com/job/kv-engine-cv-perf/12660/ : ABORTED\n\nNo problems were identified. If you know why this problem occurred, please add a suitable Cause for it. ( http://cv.jenkins.couchbase.com/job/kv-engine-cv-perf/12660/ )\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine-threadsanitizer-master/13581/ : ABORTED\n\nFailure of a CTest test  25/179 Test  #25: ep_testsuite.value_eviction.comp_passive ..................................... ( http://cv.jenkins.couchbase.com/job/kv_engine-threadsanitizer-master/13581/ )\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine-windows-master/22631/ : ABORTED\n\nTimeout of a CTest test  25/184 Test  #25: ep_testsuite.value_eviction.comp_passive .....................................} ( http://cv.jenkins.couchbase.com/job/kv_engine-windows-master/22631/ )\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine-linux-master-CE/3390/ : ABORTED\n\nFailure of a CTest test  28/200 Test  #28: ep_testsuite.value_eviction.comp_passive ..................................... ( http://cv.jenkins.couchbase.com/job/kv_engine-linux-master-CE/3390/ )\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine-linux-master/21724/ : ABORTED\n\nFailure of a CTest test  28/200 Test  #28: ep_testsuite.value_eviction.comp_passive ..................................... ( http://cv.jenkins.couchbase.com/job/kv_engine-linux-master/21724/ )\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine.ASan-UBSan/job/master/6332/ : FAILURE\n\nTimeout of a CTest test [2019-08-15T20:32:29.727Z] 129/181 Test  #59: ep_perfsuite.value_eviction ..................................................} ( http://cv.jenkins.couchbase.com/job/kv_engine.ASan-UBSan/job/master/6332/ )\n\nFailure of a CTest test [2019-08-15T18:29:01.220Z]  27/181 Test  #27: ep_testsuite.value_eviction.comp_passive ..................................... ( http://cv.jenkins.couchbase.com/job/kv_engine.ASan-UBSan/job/master/6332/ )\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine-clang_format/20336/ : SUCCESS\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine-clang_analyzer-master/19353/ : SUCCESS","accounts_in_message":[],"_revision_number":5},{"id":"f4b58f3b1167e5b83178272652f698a10fab901e","tag":"autogenerated:gerrit:newPatchSet","author":{"_account_id":1000966,"name":"Dave Rigby","email":"daver@couchbase.com","username":"drigby","avatars":[{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d32","height":32},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d56","height":56},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d100","height":100},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d120","height":120}]},"date":"2019-08-16 13:11:36.000000000","message":"Uploaded patch set 6.","accounts_in_message":[],"_revision_number":6},{"id":"2ccf5684a8641c4b724eb243c903f14a1d244e80","tag":"autogenerated:gerrit:newPatchSet","author":{"_account_id":1000966,"name":"Dave Rigby","email":"daver@couchbase.com","username":"drigby","avatars":[{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d32","height":32},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d56","height":56},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d100","height":100},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d120","height":120}]},"date":"2019-08-16 13:48:15.000000000","message":"Uploaded patch set 7.","accounts_in_message":[],"_revision_number":7},{"id":"da762b059f59fc5e8d50fc7068f77c9d2600f433","tag":"autogenerated:jenkins-gerrit-trigger","author":{"_account_id":1000011,"name":"Build Bot","email":"build@couchbase.com","username":"buildbot","avatars":[{"url":"https://www.gravatar.com/avatar/0ba35a43c05d6329d9b2136bab05a733.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d32","height":32},{"url":"https://www.gravatar.com/avatar/0ba35a43c05d6329d9b2136bab05a733.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d56","height":56},{"url":"https://www.gravatar.com/avatar/0ba35a43c05d6329d9b2136bab05a733.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d100","height":100},{"url":"https://www.gravatar.com/avatar/0ba35a43c05d6329d9b2136bab05a733.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d120","height":120}],"tags":["SERVICE_USER"]},"date":"2019-08-16 13:48:17.000000000","message":"Patch Set 6: Verified-1\n\nBuild Failed \n\nhttp://cv.jenkins.couchbase.com/job/kv_engine-threadsanitizer-master/13597/ : ABORTED\n\nBuild which was aborted due to a newer patch set being uploaded for the given review. ( http://cv.jenkins.couchbase.com/job/kv_engine-threadsanitizer-master/13597/ )\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine.ASan-UBSan/job/master/6355/ : ABORTED\n\nBuild which was aborted due to a newer patch set being uploaded for the given review. ( http://cv.jenkins.couchbase.com/job/kv_engine.ASan-UBSan/job/master/6355/ )\n\nhttp://cv.jenkins.couchbase.com/job/kv_engine-clang_analyzer-master/19364/ : FAILURE\n\nCompile error at /home/couchbase/jenkins/workspace/kv_engine-clang_analyzer-master/kv_engine/engines/ep/src/monotonic.h:43:54:\nerror: member access into incomplete type \"const std::type_info\"\n ( http://cv.jenkins.couchbase.com/job/kv_engine-clang_analyzer-master/19364/ )\n\nThe warnings threshold for this job was exceeded - \u003ca href\u003d\"warningsResult\"\u003e4 warnings\u003c/a\u003e found. 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DurabilityCompletionTask","message":"MB-35458 [SR]: Move SyncWrite completion to bg DurabilityCompletionTask\n\nChange how SyncWrites which are Resolved and awaiting Completion are\nhandled, by moving the final VBucket::commit() / abort() into a \nbackground task - DurabilityCompletionTask.\n\n+Background+\n\nThere are two reasons for making this change:\n\na) Performance - specifically latency of front-end worker threads.\n\nBy moving completion into a background task, we reduce the amount of\nwork done on the thread which actually detected the SyncWrite was\nresolved - typically the front-end DCP threads when a DCP_SEQNO_ACK\nis processed.\nGiven that we SEQNO_ACK at the end of Snapshot, A single SEQNO_ACK\ncould result in committing multiple SyncWrites. Committing one\nSyncWrite is similar to a normal front-end Set operation, so there is\npotentially a non-trivial amount of work needed to be done when\ncompleting SyncWrites, which could tie up the front-end thread (causing\nother Connections to have to wait) for a noticable amount of time.\n\nb) Simplification of lock management.\n\nDoing completion in a background task simplifies lock management, for\nexample we avoid lock inversions with earlier locks acquired during\ndcpSeqnoAck when attemping to later call notifySeqnoAvailable when this\nwas done on the original thread.\n\n+Problem+\n\nWhile (a) was the first reason identified for making this change\n(see MB-33092), (b) is the reason this change is being made now. During\ntesting the following lock-order-inversion was seen:\n\n    WARNING: ThreadSanitizer: lock-order-inversion (potential deadlock)\n    Cycle in lock order graph:\n      \n    Stream::streamMutex \u003d\u003e StreamContainer::rwlock \u003d\u003e Stream::streamMutex\n      \nThe crux of the issue is the processing of DCP_SEQNO_ACKNOWLEDGED\nmessages by the DcpProducer - this acquires the Stream::streamMutex\nbefore calling VBucket::seqnoAcknowledged(), however that function\ncurrently results in VBucket::commit() being called to synchronously\ncomplete the SyncWrite; which in turn must nodify all connected\nreplica that a new seqno is available, requiring\nStreamContainer::rwlock to be acquired:\n\n  Mutex StreamContainer::rwlock acquired here while holding mutex Stream::streamMutex in thread T15:\n    ...\n    #6 StreamContainer\u003cstd::shared_ptr\u003cStream\u003e \u003e::rlock() \n    #7 DcpProducer::notifySeqnoAvailable(Vbid, unsigned long)\n    ...\n    #13 VBucket::commit(...) \n    #14 ActiveDurabilityMonitor::commit(...) \n    #15 ActiveDurabilityMonitor::processCompletedSyncWriteQueue() \n    #16 ActiveDurabilityMonitor::seqnoAckReceived(...) \n    #17 VBucket::seqnoAcknowledged(...)\n    #18 ActiveStream::seqnoAck(...)\n    #19 DcpProducer::seqno_acknowledged(...)\n    ...\n\n  Mutex Stream::streamMutex previously acquired by the same thread here:\n    ...\n    #3 std::lock_guard\u003cstd::mutex\u003e::lock_guard(std::mutex\u0026)\n    #4 ActiveStream::seqnoAck(...)\n    #5 DcpProducer::seqno_acknowledged(...)\n    ...\n\nThis conflicts with the ordering seen when sending items out on the\nDCP connection - inside DcpProducer::step() where the\nStreamContainer::rwlock is acquired first, then ActiveStream::mutex\nacquired later:\n\n  Mutex Stream::streamMutex acquired here while holding mutex StreamContainer::rwlock in thread T15:\n    ...\n    #3 std::lock_guard\u003cstd::mutex\u003e::lock_guard(std::mutex\u0026)\n    #4 ActiveStream::next()\n    #5 DcpProducer::getNextItem() \n    #6 DcpProducer::step(dcp_message_producers*)\n    ...\n\n  Mutex StreamContainer::rwlock previously acquired by the same thread here:\n    #0 pthread_rwlock_rdlock \u003cnull\u003e (libtsan.so.0+0x00000002c98b)\n    ...\n    #4 std::shared_lock\u003ccb::RWLock\u003e::shared_lock(cb::RWLock\u0026)\n    #5 StreamContainer\u003c\u003e::ResumableIterationHandle::ResumableIterationHandle()\n    #6 StreamContainer\u003c\u003e::startResumable()\n    #7 DcpProducer::getNextItem()\n    #8 DcpProducer::step(dcp_message_producers*)\n    ...\n\n+Solution+\n\nThe processing of resolved SyncWrites moved into a new background task.\nInstead of immediately processing them within\nActiveDM::seqnoAckReceived(), that function notifies the new NonIO\nDurabilityCompletionTask that there are SyncWrites waiting for\ncompletion. \n\nDurabilityCompletionTask maintains a bool per vBucket indicating if there\nare SyncWrites for that vBucket pending completion. When the task is\nrun, for each flag which is true it calls\nVBucket::processResolvedSyncWrites() for the associated VBucket.\n\n+Implementaiton Notes+\n\nCurrently there is just a single DurabilityCompletionTask (per Bucket),\nthis was chosen as 1 task per vBucket (i.e. 1024 per Bucket) would\nbe inefficient for our current background task scheduler (both in terms\nof latency to schedule each task for only one vBucket\u0027s worth of work, \nand in terms of managing that many tasks in the future queue).\n\nHowever, that does _potentially_ mean there\u0027s fewer resources (threads)\navailable to complete SyncWrites on - previously that work could be\ndone concurrently on all frontend threads (~O(num_cpus). Now the same\nwork only has 1 thread available to run on (there\u0027s only a single\nDurabilityCompletionTask).\n\n_If_ this becomes a bottleneck we could look at increasing the number of\nDurabilityCompletionTask - e.g. sharding all vBuckets across multiple\ntasks like flusher / bgfetcher.\n\nChange-Id: I87897af1e3fd0a57e5abc2cb1ba9f795a9d3c63e\n"},"parents_data":[{"branch_name":"refs/heads/master","commit_id":"443ff63623ed6f5c98285a75fcb8501a2565a473","is_merged_in_target_branch":true,"change_id":"Ie62c72d8d1613ea069d377e071740fcabfddffcb","change_number":113379,"patch_set_number":4,"change_status":"MERGED"}],"branch":"refs/heads/master","description":"Edit commit message"},"f04c01c7ce70c9f689d0207a87df531c56fde5b5":{"kind":"REWORK","_number":10,"created":"2019-08-19 11:08:53.000000000","uploader":{"_account_id":1000966,"name":"Dave Rigby","email":"daver@couchbase.com","username":"drigby","avatars":[{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d32","height":32},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d56","height":56},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d100","height":100},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d120","height":120}]},"ref":"refs/changes/41/113141/10","fetch":{"anonymous http":{"url":"https://review.couchbase.org/kv_engine","ref":"refs/changes/41/113141/10","commands":{"Branch":"git fetch https://review.couchbase.org/kv_engine refs/changes/41/113141/10 \u0026\u0026 git checkout -b change-113141 FETCH_HEAD","Checkout":"git fetch https://review.couchbase.org/kv_engine refs/changes/41/113141/10 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.couchbase.org/kv_engine refs/changes/41/113141/10 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.couchbase.org/kv_engine refs/changes/41/113141/10 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.couchbase.org/kv_engine refs/changes/41/113141/10","Reset To":"git fetch https://review.couchbase.org/kv_engine refs/changes/41/113141/10 \u0026\u0026 git reset --hard FETCH_HEAD"}}},"commit":{"parents":[{"commit":"443ff63623ed6f5c98285a75fcb8501a2565a473","subject":"MutationLog: Perf: Don\u0027t initialise buffers until needed"}],"author":{"name":"Dave Rigby","email":"daver@couchbase.com","date":"2019-08-09 11:55:21.000000000","tz":60},"committer":{"name":"Dave Rigby","email":"daver@couchbase.com","date":"2019-08-19 11:08:45.000000000","tz":60},"subject":"MB-35458 [SR]: Move SyncWrite completion to bg DurabilityCompletionTask","message":"MB-35458 [SR]: Move SyncWrite completion to bg DurabilityCompletionTask\n\nChange how SyncWrites which are Resolved and awaiting Completion are\nhandled, by moving the final VBucket::commit() / abort() into a\nbackground task - DurabilityCompletionTask.\n\n+Background+\n\nThere are two reasons for making this change:\n\na) Performance - specifically latency of front-end worker threads.\n\nBy moving completion into a background task, we reduce the amount of\nwork done on the thread which actually detected the SyncWrite was\nresolved - typically the front-end DCP threads when a DCP_SEQNO_ACK\nis processed.\nGiven that we SEQNO_ACK at the end of Snapshot, A single SEQNO_ACK\ncould result in committing multiple SyncWrites. Committing one\nSyncWrite is similar to a normal front-end Set operation, so there is\npotentially a non-trivial amount of work needed to be done when\ncompleting SyncWrites, which could tie up the front-end thread (causing\nother Connections to have to wait) for a noticable amount of time.\n\nb) Simplification of lock management.\n\nDoing completion in a background task simplifies lock management, for\nexample we avoid lock inversions with earlier locks acquired during\ndcpSeqnoAck when attemping to later call notifySeqnoAvailable when this\nwas done on the original thread.\n\n+Problem+\n\nWhile (a) was the first reason identified for making this change\n(see MB-33092), (b) is the reason this change is being made now. During\ntesting the following lock-order-inversion was seen:\n\n    WARNING: ThreadSanitizer: lock-order-inversion (potential deadlock)\n    Cycle in lock order graph:\n\n    Stream::streamMutex \u003d\u003e StreamContainer::rwlock \u003d\u003e Stream::streamMutex\n\nThe crux of the issue is the processing of DCP_SEQNO_ACKNOWLEDGED\nmessages by the DcpProducer - this acquires the Stream::streamMutex\nbefore calling VBucket::seqnoAcknowledged(), however that function\ncurrently results in VBucket::commit() being called to synchronously\ncomplete the SyncWrite; which in turn must nodify all connected\nreplica that a new seqno is available, requiring\nStreamContainer::rwlock to be acquired:\n\n  Mutex StreamContainer::rwlock acquired here while holding mutex Stream::streamMutex in thread T15:\n    ...\n    #6 StreamContainer\u003cstd::shared_ptr\u003cStream\u003e \u003e::rlock()\n    #7 DcpProducer::notifySeqnoAvailable(Vbid, unsigned long)\n    ...\n    #13 VBucket::commit(...)\n    #14 ActiveDurabilityMonitor::commit(...)\n    #15 ActiveDurabilityMonitor::processCompletedSyncWriteQueue()\n    #16 ActiveDurabilityMonitor::seqnoAckReceived(...)\n    #17 VBucket::seqnoAcknowledged(...)\n    #18 ActiveStream::seqnoAck(...)\n    #19 DcpProducer::seqno_acknowledged(...)\n    ...\n\n  Mutex Stream::streamMutex previously acquired by the same thread here:\n    ...\n    #3 std::lock_guard\u003cstd::mutex\u003e::lock_guard(std::mutex\u0026)\n    #4 ActiveStream::seqnoAck(...)\n    #5 DcpProducer::seqno_acknowledged(...)\n    ...\n\nThis conflicts with the ordering seen when sending items out on the\nDCP connection - inside DcpProducer::step() where the\nStreamContainer::rwlock is acquired first, then ActiveStream::mutex\nacquired later:\n\n  Mutex Stream::streamMutex acquired here while holding mutex StreamContainer::rwlock in thread T15:\n    ...\n    #3 std::lock_guard\u003cstd::mutex\u003e::lock_guard(std::mutex\u0026)\n    #4 ActiveStream::next()\n    #5 DcpProducer::getNextItem()\n    #6 DcpProducer::step(dcp_message_producers*)\n    ...\n\n  Mutex StreamContainer::rwlock previously acquired by the same thread here:\n    #0 pthread_rwlock_rdlock \u003cnull\u003e (libtsan.so.0+0x00000002c98b)\n    ...\n    #4 std::shared_lock\u003ccb::RWLock\u003e::shared_lock(cb::RWLock\u0026)\n    #5 StreamContainer\u003c\u003e::ResumableIterationHandle::ResumableIterationHandle()\n    #6 StreamContainer\u003c\u003e::startResumable()\n    #7 DcpProducer::getNextItem()\n    #8 DcpProducer::step(dcp_message_producers*)\n    ...\n\n+Solution+\n\nThe processing of resolved SyncWrites moved into a new background task.\nInstead of immediately processing them within\nActiveDM::seqnoAckReceived(), that function notifies the new NonIO\nDurabilityCompletionTask that there are SyncWrites waiting for\ncompletion.\n\nDurabilityCompletionTask maintains a bool per vBucket indicating if\nthere are SyncWrites for that vBucket pending completion. When the\ntask is run, for each flag which is true it calls\nVBucket::processResolvedSyncWrites() for the associated VBucket.\n\n+Implementaiton Notes+\n\nCurrently there is just a single DurabilityCompletionTask (per Bucket),\nthis was chosen as 1 task per vBucket (i.e. 1024 per Bucket) would\nbe inefficient for our current background task scheduler (both in terms\nof latency to schedule each task for only one vBucket\u0027s worth of work,\nand in terms of managing that many tasks in the future queue).\n\nHowever, that does _potentially_ mean there\u0027s fewer resources (threads)\navailable to complete SyncWrites on - previously that work could be\ndone concurrently on all frontend threads (~O(num_cpus). Now the same\nwork only has 1 thread available to run on (there\u0027s only a single\nDurabilityCompletionTask).\n\n_If_ this becomes a bottleneck we could look at increasing the number of\nDurabilityCompletionTask - e.g. sharding all vBuckets across multiple\ntasks like flusher / bgfetcher.\n\nChange-Id: I87897af1e3fd0a57e5abc2cb1ba9f795a9d3c63e\n"},"parents_data":[{"branch_name":"refs/heads/master","commit_id":"443ff63623ed6f5c98285a75fcb8501a2565a473","is_merged_in_target_branch":true,"change_id":"Ie62c72d8d1613ea069d377e071740fcabfddffcb","change_number":113379,"patch_set_number":4,"change_status":"MERGED"}],"branch":"refs/heads/master"},"7fdb98a995f6298678e3ac7b443f9454e21ffae1":{"kind":"REWORK","_number":11,"created":"2019-08-19 13:33:39.000000000","uploader":{"_account_id":1000966,"name":"Dave Rigby","email":"daver@couchbase.com","username":"drigby","avatars":[{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d32","height":32},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d56","height":56},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d100","height":100},{"url":"https://www.gravatar.com/avatar/514e75a8d75cc1fcdb22433d445ae8f1.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d120","height":120}]},"ref":"refs/changes/41/113141/11","fetch":{"anonymous http":{"url":"https://review.couchbase.org/kv_engine","ref":"refs/changes/41/113141/11","commands":{"Branch":"git fetch https://review.couchbase.org/kv_engine refs/changes/41/113141/11 \u0026\u0026 git checkout -b change-113141 FETCH_HEAD","Checkout":"git fetch https://review.couchbase.org/kv_engine refs/changes/41/113141/11 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.couchbase.org/kv_engine refs/changes/41/113141/11 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.couchbase.org/kv_engine refs/changes/41/113141/11 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.couchbase.org/kv_engine refs/changes/41/113141/11","Reset To":"git fetch https://review.couchbase.org/kv_engine refs/changes/41/113141/11 \u0026\u0026 git reset --hard FETCH_HEAD"}}},"commit":{"parents":[{"commit":"96ed3ebe9260eed0e71b0811807e9a2c0efa509d","subject":"MB-34017: Optimize warmup - Only warmup prepares from HCS to HPS"}],"author":{"name":"Dave Rigby","email":"daver@couchbase.com","date":"2019-08-09 11:55:21.000000000","tz":60},"committer":{"name":"Dave Rigby","email":"daver@couchbase.com","date":"2019-08-19 13:33:39.000000000","tz":0},"subject":"MB-35458 [SR]: Move SyncWrite completion to bg DurabilityCompletionTask","message":"MB-35458 [SR]: Move SyncWrite completion to bg DurabilityCompletionTask\n\nChange how SyncWrites which are Resolved and awaiting Completion are\nhandled, by moving the final VBucket::commit() / abort() into a\nbackground task - DurabilityCompletionTask.\n\n+Background+\n\nThere are two reasons for making this change:\n\na) Performance - specifically latency of front-end worker threads.\n\nBy moving completion into a background task, we reduce the amount of\nwork done on the thread which actually detected the SyncWrite was\nresolved - typically the front-end DCP threads when a DCP_SEQNO_ACK\nis processed.\nGiven that we SEQNO_ACK at the end of Snapshot, A single SEQNO_ACK\ncould result in committing multiple SyncWrites. Committing one\nSyncWrite is similar to a normal front-end Set operation, so there is\npotentially a non-trivial amount of work needed to be done when\ncompleting SyncWrites, which could tie up the front-end thread (causing\nother Connections to have to wait) for a noticable amount of time.\n\nb) Simplification of lock management.\n\nDoing completion in a background task simplifies lock management, for\nexample we avoid lock inversions with earlier locks acquired during\ndcpSeqnoAck when attemping to later call notifySeqnoAvailable when this\nwas done on the original thread.\n\n+Problem+\n\nWhile (a) was the first reason identified for making this change\n(see MB-33092), (b) is the reason this change is being made now. During\ntesting the following lock-order-inversion was seen:\n\n    WARNING: ThreadSanitizer: lock-order-inversion (potential deadlock)\n    Cycle in lock order graph:\n\n    Stream::streamMutex \u003d\u003e StreamContainer::rwlock \u003d\u003e Stream::streamMutex\n\nThe crux of the issue is the processing of DCP_SEQNO_ACKNOWLEDGED\nmessages by the DcpProducer - this acquires the Stream::streamMutex\nbefore calling VBucket::seqnoAcknowledged(), however that function\ncurrently results in VBucket::commit() being called to synchronously\ncomplete the SyncWrite; which in turn must nodify all connected\nreplica that a new seqno is available, requiring\nStreamContainer::rwlock to be acquired:\n\n  Mutex StreamContainer::rwlock acquired here while holding mutex Stream::streamMutex in thread T15:\n    ...\n    #6 StreamContainer\u003cstd::shared_ptr\u003cStream\u003e \u003e::rlock()\n    #7 DcpProducer::notifySeqnoAvailable(Vbid, unsigned long)\n    ...\n    #13 VBucket::commit(...)\n    #14 ActiveDurabilityMonitor::commit(...)\n    #15 ActiveDurabilityMonitor::processCompletedSyncWriteQueue()\n    #16 ActiveDurabilityMonitor::seqnoAckReceived(...)\n    #17 VBucket::seqnoAcknowledged(...)\n    #18 ActiveStream::seqnoAck(...)\n    #19 DcpProducer::seqno_acknowledged(...)\n    ...\n\n  Mutex Stream::streamMutex previously acquired by the same thread here:\n    ...\n    #3 std::lock_guard\u003cstd::mutex\u003e::lock_guard(std::mutex\u0026)\n    #4 ActiveStream::seqnoAck(...)\n    #5 DcpProducer::seqno_acknowledged(...)\n    ...\n\nThis conflicts with the ordering seen when sending items out on the\nDCP connection - inside DcpProducer::step() where the\nStreamContainer::rwlock is acquired first, then ActiveStream::mutex\nacquired later:\n\n  Mutex Stream::streamMutex acquired here while holding mutex StreamContainer::rwlock in thread T15:\n    ...\n    #3 std::lock_guard\u003cstd::mutex\u003e::lock_guard(std::mutex\u0026)\n    #4 ActiveStream::next()\n    #5 DcpProducer::getNextItem()\n    #6 DcpProducer::step(dcp_message_producers*)\n    ...\n\n  Mutex StreamContainer::rwlock previously acquired by the same thread here:\n    #0 pthread_rwlock_rdlock \u003cnull\u003e (libtsan.so.0+0x00000002c98b)\n    ...\n    #4 std::shared_lock\u003ccb::RWLock\u003e::shared_lock(cb::RWLock\u0026)\n    #5 StreamContainer\u003c\u003e::ResumableIterationHandle::ResumableIterationHandle()\n    #6 StreamContainer\u003c\u003e::startResumable()\n    #7 DcpProducer::getNextItem()\n    #8 DcpProducer::step(dcp_message_producers*)\n    ...\n\n+Solution+\n\nThe processing of resolved SyncWrites moved into a new background task.\nInstead of immediately processing them within\nActiveDM::seqnoAckReceived(), that function notifies the new NonIO\nDurabilityCompletionTask that there are SyncWrites waiting for\ncompletion.\n\nDurabilityCompletionTask maintains a bool per vBucket indicating if\nthere are SyncWrites for that vBucket pending completion. When the\ntask is run, for each flag which is true it calls\nVBucket::processResolvedSyncWrites() for the associated VBucket.\n\n+Implementaiton Notes+\n\nCurrently there is just a single DurabilityCompletionTask (per Bucket),\nthis was chosen as 1 task per vBucket (i.e. 1024 per Bucket) would\nbe inefficient for our current background task scheduler (both in terms\nof latency to schedule each task for only one vBucket\u0027s worth of work,\nand in terms of managing that many tasks in the future queue).\n\nHowever, that does _potentially_ mean there\u0027s fewer resources (threads)\navailable to complete SyncWrites on - previously that work could be\ndone concurrently on all frontend threads (~O(num_cpus). Now the same\nwork only has 1 thread available to run on (there\u0027s only a single\nDurabilityCompletionTask).\n\n_If_ this becomes a bottleneck we could look at increasing the number of\nDurabilityCompletionTask - e.g. sharding all vBuckets across multiple\ntasks like flusher / bgfetcher.\n\nChange-Id: I87897af1e3fd0a57e5abc2cb1ba9f795a9d3c63e\nReviewed-on: http://review.couchbase.org/113141\nTested-by: Build Bot \u003cbuild@couchbase.com\u003e\nReviewed-by: Ben Huddleston \u003cben.huddleston@couchbase.com\u003e\n"},"parents_data":[{"branch_name":"refs/heads/master","commit_id":"96ed3ebe9260eed0e71b0811807e9a2c0efa509d","is_merged_in_target_branch":true,"change_id":"Iaf310fe5d7f508303d05d1f5a9632b9dfcf368a7","change_number":113267,"patch_set_number":8,"change_status":"MERGED"}],"branch":"refs/heads/master"}},"requirements":[],"submit_records":[],"submit_requirements":[]}