概述
我有一个将MongoDB用作数据库的ruby应用程序。在为此应用程序运行测试时，我正在使用Minitest为每个测试用例创建集合和索引。
使用docker compose创建测试环境，其中一个容器正在运行测试，另一个容器正在运行MongoDB。
问题
第一次运行测试时，过一会儿MongoDB卡住了。任何查询集合的请求都不会响应。
在使用命令行客户端开始运行测试之前，我已经能够连接到它。当我使用db.serverStatus()检查服务器的状态时，我看到某些操作已获得锁。通过查看globalLock字段，我了解到1个操作具有write锁，并且有2个操作正在等待获取read锁。
我无法理解为什么这些操作会挂起而不产生锁。我不知道如何进一步调试此问题。
MongoDB版本：3.6.13 Ruby驱动程序版本：2.8.0
我还尝试了其他版本3.6.x和4.0
我们非常感谢您的帮助或指导。
db.serverStatus输出
{
"host" : "c658c885eb90","version" : "3.6.14","process" : "mongod","pid" : NumberLong(1),"uptime" : 98,"uptimeMillis" : NumberLong(97909),"uptimeEstimate" : NumberLong(97),"localTime" : ISODate("2019-11-03T16:09:14.289Z"),"asserts" : {
"regular" : 0,"warning" : 0,"msg" : 0,"user" : 0,"rollovers" : 0
},"connections" : {
"current" : 6,"available" : 838854,"totalCreated" : 11
},"extra_info" : {
"note" : "fields vary by platform","page_faults" : 0
},"globalLock" : {
"totalTime" : NumberLong(97908000),"currentQueue" : {
"total" : 2,"readers" : 2,"writers" : 0
},"activeclients" : {
"total" : 13,"readers" : 0,"writers" : 1
}
},"locks" : {
"Global" : {
"acquireCount" : {
"r" : NumberLong(14528),"w" : NumberLong(12477),"W" : NumberLong(5)
}
},"Database" : {
"acquireCount" : {
"r" : NumberLong(1020),"w" : NumberLong(14459),"R" : NumberLong(3),"W" : NumberLong(6599)
},"acquireWaitCount" : {
"r" : NumberLong(2)
},"timeAcquiringmicros" : {
"r" : NumberLong(76077321)
}
},"Collection" : {
"acquireCount" : {
"R" : NumberLong(1018),"W" : NumberLong(8805)
}
},"Metadata" : {
"acquireCount" : {
"W" : NumberLong(37)
}
}
},"logicalSessionRecordCache" : {
"activeSessionsCount" : 3,"sessionsCollectionJobCount" : 1,"lastSessionsCollectionJobDurationmillis" : 0,"lastSessionsCollectionJobTimestamp" : ISODate("2019-11-03T16:07:36.407Z"),"lastSessionsCollectionJobEntriesRefreshed" : 0,"lastSessionsCollectionJobEntriesEnded" : 0,"lastSessionsCollectionJobCursorsClosed" : 0,"transactionReaperJobCount" : 0,"lastTransactionReaperJobDurationmillis" : 0,"lastTransactionReaperJobTimestamp" : ISODate("2019-11-03T16:07:36.407Z"),"lastTransactionReaperJobEntriesCleanedUp" : 0
},"network" : {
"bytesIn" : NumberLong(1682811),"bytesOut" : NumberLong(1019834),"physicalBytesIn" : NumberLong(1682811),"physicalBytesOut" : NumberLong(1019834),"numRequests" : NumberLong(7822),"compression" : {
"snappy" : {
"compressor" : {
"bytesIn" : NumberLong(0),"bytesOut" : NumberLong(0)
},"decompressor" : {
"bytesIn" : NumberLong(0),"bytesOut" : NumberLong(0)
}
}
},"serviceExecutorTaskStats" : {
"executor" : "passthrough","threadsRunning" : 6
}
},"opLatencies" : {
"reads" : {
"latency" : NumberLong(61374),"ops" : NumberLong(963)
},"writes" : {
"latency" : NumberLong(13074),"ops" : NumberLong(286)
},"commands" : {
"latency" : NumberLong(988232),"ops" : NumberLong(6570)
}
},"opReadConcernCounters" : {
"available" : NumberLong(0),"linearizable" : NumberLong(0),"local" : NumberLong(0),"majority" : NumberLong(0),"none" : NumberLong(944)
},"opcounters" : {
"insert" : 246,"query" : 944,"update" : 40,"delete" : 0,"getmore" : 0,"command" : 6595
},"opcountersRepl" : {
"insert" : 0,"query" : 0,"update" : 0,"command" : 0
},"storageEngine" : {
"name" : "ephemeralForTest","supportsCommittedReads" : false,"readOnly" : false,"persistent" : false
},"tcmalloc" : {
"generic" : {
"current_allocated_bytes" : 8203504,"heap_size" : 12496896
},"tcmalloc" : {
"pageheap_free_bytes" : 2760704,"pageheap_unmapped_bytes" : 0,"max_total_thread_cache_bytes" : 516947968,"current_total_thread_cache_bytes" : 1007120,"total_free_bytes" : 1532688,"central_cache_free_bytes" : 231040,"transfer_cache_free_bytes" : 294528,"thread_cache_free_bytes" : 1007120,"aggressive_memory_decommit" : 0,"pageheap_committed_bytes" : 12496896,"pageheap_scavenge_count" : 0,"pageheap_commit_count" : 9,"pageheap_total_commit_bytes" : 12496896,"pageheap_decommit_count" : 0,"pageheap_total_decommit_bytes" : 0,"pageheap_reserve_count" : 9,"pageheap_total_reserve_bytes" : 12496896,"spinlock_total_delay_ns" : 0,"formattedString" : "------------------------------------------------\nmALLOC: 8204080 ( 7.8 MiB) Bytes in use by application\nmALLOC: + 2760704 ( 2.6 MiB) Bytes in page heap freelist\nmALLOC: + 231040 ( 0.2 MiB) Bytes in central cache freelist\nmALLOC: + 294528 ( 0.3 MiB) Bytes in transfer cache freelist\nmALLOC: + 1006544 ( 1.0 MiB) Bytes in thread cache freelists\nmALLOC: + 1204480 ( 1.1 MiB) Bytes in malloc metadata\nmALLOC: ------------\nmALLOC: = 13701376 ( 13.1 MiB) actual memory used (physical + swap)\nmALLOC: + 0 ( 0.0 MiB) Bytes released to OS (aka unmapped)\nmALLOC: ------------\nmALLOC: = 13701376 ( 13.1 MiB) Virtual address space used\nmALLOC:\nmALLOC: 415 Spans in use\nmALLOC: 18 Thread heaps in use\nmALLOC: 4096 Tcmalloc page size\n------------------------------------------------\nCall ReleaseFreeMemory() to release freelist memory to the OS (via madvise()).\nBytes released to the OS take up virtual address space but no physical memory.\n"
}
},"transactions" : {
"retriedCommandsCount" : NumberLong(0),"retriedStatementsCount" : NumberLong(0),"transactionsCollectionWriteCount" : NumberLong(0)
},"transportSecurity" : {
"1.0" : NumberLong(0),"1.1" : NumberLong(0),"1.2" : NumberLong(0),"1.3" : NumberLong(0),"unknown" : NumberLong(0)
},"mem" : {
"bits" : 64,"resident" : 41,"virtual" : 836,"supported" : true,"mapped" : 0
},"metrics" : {
"commands" : {
"buildInfo" : {
"failed" : NumberLong(0),"total" : NumberLong(2)
},"count" : {
"failed" : NumberLong(0),"total" : NumberLong(21)
},"createIndexes" : {
"failed" : NumberLong(0),"total" : NumberLong(5656)
},"drop" : {
"failed" : NumberLong(0),"total" : NumberLong(784)
},"dropIndexes" : {
"failed" : NumberLong(87),"total" : NumberLong(87)
},"find" : {
"failed" : NumberLong(0),"total" : NumberLong(944)
},"getLog" : {
"failed" : NumberLong(0),"total" : NumberLong(1)
},"insert" : {
"failed" : NumberLong(0),"total" : NumberLong(246)
},"isMaster" : {
"failed" : NumberLong(0),"total" : NumberLong(38)
},"listCollections" : {
"failed" : NumberLong(0),"listIndexes" : {
"failed" : NumberLong(1),"replSetGetStatus" : {
"failed" : NumberLong(1),"serverStatus" : {
"failed" : NumberLong(0),"update" : {
"failed" : NumberLong(0),"total" : NumberLong(40)
},"whatsmyuri" : {
"failed" : NumberLong(0),"total" : NumberLong(1)
}
},"cursor" : {
"timedOut" : NumberLong(0),"open" : {
"noTimeout" : NumberLong(0),"pinned" : NumberLong(0),"total" : NumberLong(0)
}
},"document" : {
"deleted" : NumberLong(0),"inserted" : NumberLong(246),"returned" : NumberLong(398),"updated" : NumberLong(40)
},"getLastError" : {
"wtime" : {
"num" : 0,"totalMillis" : 0
},"wtimeouts" : NumberLong(0)
},"operation" : {
"scanAndOrder" : NumberLong(0),"writeConflicts" : NumberLong(0)
},"query" : {
"updateoneOpStyleBroadcastWithExactIDCount" : NumberLong(0),"upsertReplacementCannotTargetByQueryCount" : NumberLong(0)
},"queryExecutor" : {
"scanned" : NumberLong(435),"scannedObjects" : NumberLong(438)
},"record" : {
"moves" : NumberLong(0)
},"repl" : {
"executor" : {
"pool" : {
"inProgressCount" : 0
},"queues" : {
"networkInProgress" : 0,"sleepers" : 0
},"unsignaledEvents" : 0,"shuttingDown" : false,"networkinterface" : "\nNetworkinterfaceASIO Operations' Diagnostic:\nOperation: Count: \nConnecting 0 \nIn Progress 0 \nSucceeded 0 \nCanceled 0 \nFailed 0 \nTimed Out 0 \n\n"
},"apply" : {
"attemptsToBecomeSecondary" : NumberLong(0),"batchSize" : NumberLong(0),"batches" : {
"num" : 0,"totalMillis" : 0
},"ops" : NumberLong(0)
},"buffer" : {
"count" : NumberLong(0),"maxSizeBytes" : NumberLong(0),"sizeBytes" : NumberLong(0)
},"initialSync" : {
"completed" : NumberLong(0),"failedAttempts" : NumberLong(0),"failures" : NumberLong(0)
},"network" : {
"bytes" : NumberLong(0),"getmores" : {
"num" : 0,"ops" : NumberLong(0),"readersCreated" : NumberLong(0)
},"preload" : {
"docs" : {
"num" : 0,"indexes" : {
"num" : 0,"totalMillis" : 0
}
}
},"storage" : {
"freelist" : {
"search" : {
"bucketExhausted" : NumberLong(0),"requests" : NumberLong(0),"scanned" : NumberLong(0)
}
}
},"ttl" : {
"deletedDocuments" : NumberLong(0),"passes" : NumberLong(1)
}
},"ok" : 1
}