We are running apache-cassandra-3.11.4, 10 node cluster with -Xms32G -Xmx32G -Xmn8G using CMS. after running couple of days one of the node become unresponsive and threaddump (jstack -F) shows deadlock.
Found one Java-level deadlock: ============================= "Native-Transport-Requests-144": waiting to lock Monitor@0x00007cd5142e4d08 (Object@0x00007f6e00348268, a java/io/ExpiringCache), which is held by "CompactionExecutor:115134" "CompactionExecutor:115134": waiting to lock Monitor@0x00007f6bcaf130f8 (Object@0x00007f6dff31faa0, a ch/qos/logback/core/joran/spi/ConfigurationWatchList), which is held by "Native-Transport-Requests-144" Found a total of 1 deadlock. I have seen this couple of time now with different nodes with following in system.log IndexSummaryRedistribution.java:77 - Redistributing index summaries NoSpamLogger.java:91 - Maximum memory usage reached (536870912), cannot allocate chunk of 1048576 also lookin in gc log there has not been a ParNew collection for last 10hrs, only CMS collections. 1739842.375: [GC (CMS Final Remark) [YG occupancy: 2712269 K (7549760 K)] 1739842.375: [Rescan (parallel) , 0.0614157 secs] 1739842.437: [weak refs processing, 0.0000994 secs] 1739842.437: [class unloading, 0.0231076 secs] 1739842.460: [scrub symbol table, 0.0061049 secs] 1739842.466: [scrub string table, 0.0043847 secs][1 CMS-remark: 17696837K(25165824K)] 20409107K(32715584K), 0.0953750 secs] [Times: user=2.95 sys=0.00, real=0.09 secs] 1739842.471: [CMS-concurrent-sweep-start] 1739848.572: [CMS-concurrent-sweep: 6.101/6.101 secs] [Times: user=6.13 sys=0.00, real=6.10 secs] 1739848.573: [CMS-concurrent-reset-start] 1739848.645: [CMS-concurrent-reset: 0.072/0.072 secs] [Times: user=0.08 sys=0.00, real=0.08 secs] 1739858.653: [GC (CMS Initial Mark) [1 CMS-initial-mark: 17696837K(25165824K)] 20409111K(32715584K), 0.0584838 secs] [Times: user=2.68 sys=0.00, real=0.06 secs] 1739858.713: [CMS-concurrent-mark-start] 1739860.496: [CMS-concurrent-mark: 1.784/1.784 secs] [Times: user=84.77 sys=0.00, real=1.79 secs] 1739860.497: [CMS-concurrent-preclean-start] 1739860.566: [CMS-concurrent-preclean: 0.070/0.070 secs] [Times: user=0.07 sys=0.00, real=0.07 secs] 1739860.567: [CMS-concurrent-abortable-preclean-start] CMS: abort preclean due to time 1739866.333: [CMS-concurrent-abortable-preclean: 5.766/5.766 secs] [Times: user=5.80 sys=0.00, real=5.76 secs] Java HotSpot(TM) 64-Bit Server VM (25.162-b12) for linux-amd64 JRE (1.8.0_162-b12) Memory: 4k page, physical 792290076k(2780032k free), swap 16777212k(16693756k free) CommandLine flags: -XX:+AlwaysPreTouch -XX:CICompilerCount=15 -XX:+CMSClassUnloadingEnabled -XX:+CMSEdenChunksRecordAlways -XX:CMSInitiatingOccupancyFraction=40 -XX:+CMSParallelInitialMarkEnabled -XX:+CMSParallelRemarkEnabled -XX:CMSWaitDuration=10000 -XX:ConcGCThreads=50 -XX:+CrashOnOutOfMemoryError -XX:GCLogFileSize=10485760 -XX:+HeapDumpOnOutOfMemoryError -XX:InitialHeapSize=34359738368 -XX:InitialTenuringThreshold=1 -XX:+ManagementServer -XX:MaxHeapSize=34359738368 -XX:MaxNewSize=8589934592 -XX:MaxTenuringThreshold=1 -XX:MinHeapDeltaBytes=196608 -XX:NewSize=8589934592 -XX:NumberOfGCLogFiles=10 -XX:OldPLABSize=16 -XX:OldSize=25769803776 -XX:OnOutOfMemoryError=kill -9 %p -XX:ParallelGCThreads=50 -XX:+PerfDisableSharedMem -XX:+PrintGC -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+ResizeTLAB -XX:StringTableSize=1000003 -XX:SurvivorRatio=8 -XX:ThreadPriorityPolicy=42 -XX:ThreadStackSize=256 -XX:-UseBiasedLocking -XX:+UseCMSInitiatingOccupancyOnly -XX:+UseConcMarkSweepGC -XX:+UseCondCardMark -XX:+UseFastUnorderedTimeStamps -XX:+UseGCLogFileRotation -XX:+UseNUMA -XX:+UseNUMAInterleaving -XX:+UseParNewGC -XX:+UseTLAB -XX:+UseThreadPriorities --Thanks --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org