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access\n\nAs reported by ThreadSanitizer. CouchKVStore maintains three maps of\nvBucketID to counter - dbFileRevMap, cachedDocCount \u0026\ncachedDeleteCount. These are read by some of the stats functions\n(e.g. doDcpVbTakeoverStats) without a lock and hence there is a\npotential race.\n\nSolve this by changing the type of these counters to RelaxedAtomic.\n\nWARNING: ThreadSanitizer: data race (pid\u003d14070)\n  Write of size 8 at 0x7d9000002000 by thread T7 (mutexes: write M12364):\n    #0 CouchKVStore::saveDocs(unsigned short, unsigned long, _doc**, _docinfo**, unsigned long, KVStatsCtx\u0026) /home/couchbase/couchbase/ep-engine/src/couch-kvstore/couch-kvstore.cc:1932:9 (ep.so+0x000000146628)\n    #1 CouchKVStore::commit2couchstore(Callback\u003cKVStatsCtx\u003e*) /home/couchbase/couchbase/ep-engine/src/couch-kvstore/couch-kvstore.cc:1808:34 (ep.so+0x00000013fcb7)\n    #2 CouchKVStore::commit(Callback\u003cKVStatsCtx\u003e*) /home/couchbase/couchbase/ep-engine/src/couch-kvstore/couch-kvstore.cc:1095:13 (ep.so+0x00000013f941)\n    #3 EventuallyPersistentStore::commit(unsigned short) /home/couchbase/couchbase/ep-engine/src/ep.cc:3351:13 (ep.so+0x00000008a0f6)\n    #4 EventuallyPersistentStore::flushVBucket(unsigned short) /home/couchbase/couchbase/ep-engine/src/ep.cc:3298:17 (ep.so+0x0000000891b0)\n    #5 Flusher::flushVB() /home/couchbase/couchbase/ep-engine/src/flusher.cc:296:13 (ep.so+0x0000000ddd05)\n    #6 Flusher::step(GlobalTask*) /home/couchbase/couchbase/ep-engine/src/flusher.cc:186:9 (ep.so+0x0000000dc6e5)\n    #7 FlusherTask::run() /home/couchbase/couchbase/ep-engine/src/tasks.cc:63:12 (ep.so+0x000000112222)\n    #8 ExecutorThread::run() /home/couchbase/couchbase/ep-engine/src/executorthread.cc:115:26 (ep.so+0x0000000d86ee)\n    #9 launch_executor_thread(void*) /home/couchbase/couchbase/ep-engine/src/executorthread.cc:33:9 (ep.so+0x0000000d8265)\n    #10 platform_thread_wrap /home/couchbase/couchbase/platform/src/cb_pthreads.c:23:5 (libplatform.so.0.1.0+0x000000003c31)\n\n  Previous read of size 8 at 0x7d9000002000 by main thread (mutexes: write M18926):\n    #0 CouchKVStore::getNumPersistedDeletes(unsigned short) /home/couchbase/couchbase/ep-engine/src/couch-kvstore/couch-kvstore.cc:2239:23 (ep.so+0x000000147e0f)\n    #1 EventuallyPersistentEngine::doDcpVbTakeoverStats(void const*, void (*)(char const*, unsigned short, char const*, unsigned int, void const*), std::string\u0026, unsigned short) /home/couchbase/couchbase/ep-engine/src/ep_engine.cc:5721:28 (ep.so+0x0000000b196e)\n    #2 EventuallyPersistentEngine::getStats(void const*, char const*, int, void (*)(char const*, unsigned short, char const*, unsigned int, void const*)) /home/couchbase/couchbase/ep-engine/src/ep_engine.cc:4672:14 (ep.so+0x0000000b069f)\n    #3 EvpGetStats(engine_interface*, void const*, char const*, int, void (*)(char const*, unsigned short, char const*, unsigned int, void const*)) /home/couchbase/couchbase/ep-engine/src/ep_engine.cc:214:38 (ep.so+0x00000009f26e)\n    #4 mock_get_stats(engine_interface*, void const*, char const*, int, void (*)(char const*, unsigned short, char const*, unsigned int, void const*)) /home/couchbase/couchbase/memcached/programs/engine_testapp/engine_testapp.cc:239:19 (engine_testapp+0x0000004c553d)\n    #5 get_int_stat(engine_interface*, engine_interface_v1*, char const*, char const*) /home/couchbase/couchbase/ep-engine/tests/ep_test_apis.cc:990:24 (ep_testsuite.so+0x000000083c04)\n    #6 test_dcp_vbtakeover_no_stream(engine_interface*, engine_interface_v1*) /home/couchbase/couchbase/ep-engine/tests/ep_testsuite.cc:3565:15 (ep_testsuite.so+0x000000055d43)\n    #7 execute_test(test, char const*, char const*) /home/couchbase/couchbase/memcached/programs/engine_testapp/engine_testapp.cc:1090:19 (engine_testapp+0x0000004c4142)\n    #8 main /home/couchbase/couchbase/memcached/programs/engine_testapp/engine_testapp.cc:1439 (engine_testapp+0x0000004c4142)\n\nChange-Id: I593b31417bfe47d8ed50dd986f51763604e54645\n"},"parents_data":[{"branch_name":"refs/heads/master","commit_id":"4656ffe40ba5ccef42701c9e6ce1a82a370f6565","is_merged_in_target_branch":false,"change_id":"Idd8c9758f0cb0d8b0f3d3b6e828a207be7d4fc86","change_number":55872,"patch_set_number":1,"change_status":"MERGED"}],"branch":"refs/heads/master"},"a847eb3aa610956ba738098d45767c012ed8bdfb":{"kind":"REWORK","_number":2,"created":"2015-10-07 22:30:17.000000000","uploader":{"_account_id":1000097,"name":"Chiyoung Seo","email":"chiyoung@northscale.com","username":"chiyoung","avatars":[{"url":"https://www.gravatar.com/avatar/ec517f4126dd292151b452ce4d1edf31.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d32","height":32},{"url":"https://www.gravatar.com/avatar/ec517f4126dd292151b452ce4d1edf31.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d56","height":56},{"url":"https://www.gravatar.com/avatar/ec517f4126dd292151b452ce4d1edf31.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d100","height":100},{"url":"https://www.gravatar.com/avatar/ec517f4126dd292151b452ce4d1edf31.jpg?d\u003didenticon\u0026r\u003dpg\u0026s\u003d120","height":120}]},"ref":"refs/changes/73/55873/2","fetch":{"anonymous http":{"url":"https://review.couchbase.org/ep-engine","ref":"refs/changes/73/55873/2","commands":{"Branch":"git fetch https://review.couchbase.org/ep-engine refs/changes/73/55873/2 \u0026\u0026 git checkout -b change-55873 FETCH_HEAD","Checkout":"git fetch https://review.couchbase.org/ep-engine refs/changes/73/55873/2 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.couchbase.org/ep-engine refs/changes/73/55873/2 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.couchbase.org/ep-engine refs/changes/73/55873/2 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.couchbase.org/ep-engine refs/changes/73/55873/2","Reset To":"git fetch https://review.couchbase.org/ep-engine refs/changes/73/55873/2 \u0026\u0026 git reset --hard FETCH_HEAD"}}},"commit":{"parents":[{"commit":"ccdc14324cfe1a7a69ccdebdab3769b2218e6ae8","subject":"Address data race in DcpConsumer, by acquiring readyMutex"}],"author":{"name":"Dave Rigby","email":"daver@couchbase.com","date":"2015-10-07 15:27:03.000000000","tz":0},"committer":{"name":"Chiyoung Seo","email":"chiyoung@couchbase.com","date":"2015-10-07 22:30:17.000000000","tz":0},"subject":"Fix data race in CouchKVStore stats access","message":"Fix data race in CouchKVStore stats access\n\nAs reported by ThreadSanitizer. CouchKVStore maintains three maps of\nvBucketID to counter - dbFileRevMap, cachedDocCount \u0026\ncachedDeleteCount. These are read by some of the stats functions\n(e.g. doDcpVbTakeoverStats) without a lock and hence there is a\npotential race.\n\nSolve this by changing the type of these counters to RelaxedAtomic.\n\nWARNING: ThreadSanitizer: data race (pid\u003d14070)\n  Write of size 8 at 0x7d9000002000 by thread T7 (mutexes: write M12364):\n    #0 CouchKVStore::saveDocs(unsigned short, unsigned long, _doc**, _docinfo**, unsigned long, KVStatsCtx\u0026) /home/couchbase/couchbase/ep-engine/src/couch-kvstore/couch-kvstore.cc:1932:9 (ep.so+0x000000146628)\n    #1 CouchKVStore::commit2couchstore(Callback\u003cKVStatsCtx\u003e*) /home/couchbase/couchbase/ep-engine/src/couch-kvstore/couch-kvstore.cc:1808:34 (ep.so+0x00000013fcb7)\n    #2 CouchKVStore::commit(Callback\u003cKVStatsCtx\u003e*) /home/couchbase/couchbase/ep-engine/src/couch-kvstore/couch-kvstore.cc:1095:13 (ep.so+0x00000013f941)\n    #3 EventuallyPersistentStore::commit(unsigned short) /home/couchbase/couchbase/ep-engine/src/ep.cc:3351:13 (ep.so+0x00000008a0f6)\n    #4 EventuallyPersistentStore::flushVBucket(unsigned short) /home/couchbase/couchbase/ep-engine/src/ep.cc:3298:17 (ep.so+0x0000000891b0)\n    #5 Flusher::flushVB() /home/couchbase/couchbase/ep-engine/src/flusher.cc:296:13 (ep.so+0x0000000ddd05)\n    #6 Flusher::step(GlobalTask*) /home/couchbase/couchbase/ep-engine/src/flusher.cc:186:9 (ep.so+0x0000000dc6e5)\n    #7 FlusherTask::run() /home/couchbase/couchbase/ep-engine/src/tasks.cc:63:12 (ep.so+0x000000112222)\n    #8 ExecutorThread::run() /home/couchbase/couchbase/ep-engine/src/executorthread.cc:115:26 (ep.so+0x0000000d86ee)\n    #9 launch_executor_thread(void*) /home/couchbase/couchbase/ep-engine/src/executorthread.cc:33:9 (ep.so+0x0000000d8265)\n    #10 platform_thread_wrap /home/couchbase/couchbase/platform/src/cb_pthreads.c:23:5 (libplatform.so.0.1.0+0x000000003c31)\n\n  Previous read of size 8 at 0x7d9000002000 by main thread (mutexes: write M18926):\n    #0 CouchKVStore::getNumPersistedDeletes(unsigned short) /home/couchbase/couchbase/ep-engine/src/couch-kvstore/couch-kvstore.cc:2239:23 (ep.so+0x000000147e0f)\n    #1 EventuallyPersistentEngine::doDcpVbTakeoverStats(void const*, void (*)(char const*, unsigned short, char const*, unsigned int, void const*), std::string\u0026, unsigned short) /home/couchbase/couchbase/ep-engine/src/ep_engine.cc:5721:28 (ep.so+0x0000000b196e)\n    #2 EventuallyPersistentEngine::getStats(void const*, char const*, int, void (*)(char const*, unsigned short, char const*, unsigned int, void const*)) /home/couchbase/couchbase/ep-engine/src/ep_engine.cc:4672:14 (ep.so+0x0000000b069f)\n    #3 EvpGetStats(engine_interface*, void const*, char const*, int, void (*)(char const*, unsigned short, char const*, unsigned int, void const*)) /home/couchbase/couchbase/ep-engine/src/ep_engine.cc:214:38 (ep.so+0x00000009f26e)\n    #4 mock_get_stats(engine_interface*, void const*, char const*, int, void (*)(char const*, unsigned short, char const*, unsigned int, void const*)) /home/couchbase/couchbase/memcached/programs/engine_testapp/engine_testapp.cc:239:19 (engine_testapp+0x0000004c553d)\n    #5 get_int_stat(engine_interface*, engine_interface_v1*, char const*, char const*) /home/couchbase/couchbase/ep-engine/tests/ep_test_apis.cc:990:24 (ep_testsuite.so+0x000000083c04)\n    #6 test_dcp_vbtakeover_no_stream(engine_interface*, engine_interface_v1*) /home/couchbase/couchbase/ep-engine/tests/ep_testsuite.cc:3565:15 (ep_testsuite.so+0x000000055d43)\n    #7 execute_test(test, char const*, char const*) /home/couchbase/couchbase/memcached/programs/engine_testapp/engine_testapp.cc:1090:19 (engine_testapp+0x0000004c4142)\n    #8 main /home/couchbase/couchbase/memcached/programs/engine_testapp/engine_testapp.cc:1439 (engine_testapp+0x0000004c4142)\n\nChange-Id: I593b31417bfe47d8ed50dd986f51763604e54645\nReviewed-on: http://review.couchbase.org/55873\nReviewed-by: abhinav dangeti \u003cabhinav@couchbase.com\u003e\nReviewed-by: Chiyoung Seo \u003cchiyoung@couchbase.com\u003e\nTested-by: Chiyoung Seo \u003cchiyoung@couchbase.com\u003e\n"},"parents_data":[{"branch_name":"refs/heads/master","commit_id":"ccdc14324cfe1a7a69ccdebdab3769b2218e6ae8","is_merged_in_target_branch":true,"change_id":"I196a78e54bf8014967a51cdb081126597153f77b","change_number":55881,"patch_set_number":2,"change_status":"MERGED"}],"branch":"refs/heads/master"}},"requirements":[],"submit_records":[],"submit_requirements":[]}