Cassandra 检测到泄漏：在垃圾收集引用之前未释放
我在Cassandra 3.11.5中遇到以下错误Cassandra 检测到泄漏：在垃圾收集引用之前未释放,cassandra,cassandra-3.11,Cassandra,Cassandra 3.11,我在Cassandra 3.11.5中遇到以下错误 LEAK DETECTED: a reference (org.apache.cassandra.utils.concurrent.Ref$State@356cb07f) to class org.apache.cassandra.io.util.SafeMemory$MemoryTidy@1709177197:Memory@[7e7a3b64b910..7e7a3b96b910) was not released before the ref
LEAK DETECTED: a reference (org.apache.cassandra.utils.concurrent.Ref$State@356cb07f) to class org.apache.cassandra.io.util.SafeMemory$MemoryTidy@1709177197:Memory@[7e7a3b64b910..7e7a3b96b910) was not released before the reference was garbage collected
ERROR [CompactionExecutor:3763] 2020-11-02 02:34:53,316 CassandraDaemon.java:228 - Exception in thread Thread[CompactionExecutor:3763,1,main]
org.apache.cassandra.io.FSReadError: java.io.IOException: Map failed
at org.apache.cassandra.io.util.ChannelProxy.map(ChannelProxy.java:157) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.util.MmappedRegions$State.add(MmappedRegions.java:310) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.util.MmappedRegions$State.access$400(MmappedRegions.java:246) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.util.MmappedRegions.updateState(MmappedRegions.java:170) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.util.MmappedRegions.<init>(MmappedRegions.java:73) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.util.MmappedRegions.<init>(MmappedRegions.java:61) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.util.MmappedRegions.map(MmappedRegions.java:104) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.util.FileHandle$Builder.complete(FileHandle.java:362) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.sstable.format.big.BigTableWriter.openEarly(BigTableWriter.java:290) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.sstable.SSTableRewriter.maybeReopenEarly(SSTableRewriter.java:180) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.sstable.SSTableRewriter.append(SSTableRewriter.java:135) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.db.compaction.writers.DefaultCompactionWriter.realAppend(DefaultCompactionWriter.java:65) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.db.compaction.writers.CompactionAwareWriter.append(CompactionAwareWriter.java:142) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.db.compaction.CompactionTask.runMayThrow(CompactionTask.java:201) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:85) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:61) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionCandidate.run(CompactionManager.java:268) ~[apache-cassandra-3.11.5.jar:3.11.5]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_60]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_60]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_60]
at org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:84) [apache-cassandra-3.11.5.jar:3.11.5]
at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]
Caused by: java.io.IOException: Map failed
at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:939) ~[na:1.8.0_60]
at org.apache.cassandra.io.util.ChannelProxy.map(ChannelProxy.java:153) ~[apache-cassandra-3.11.5.jar:3.11.5]
... 23 common frames omitted
Caused by: java.lang.OutOfMemoryError: Map failed
at sun.nio.ch.FileChannelImpl.map0(Native Method) ~[na:1.8.0_60]
at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:936) ~[na:1.8.0_60]
... 24 common frames omitted
WARN [GossipTasks:1] 2020-11-02 02:34:53,302 FailureDetector.java:278 - Not marking nodes down due to local pause of 7468254535 > 5000000000
ERROR [Reference-Reaper] 2020-11-02 02:34:53,208 Ref.java:229 - LEAK DETECTED: a reference (org.apache.cassandra.utils.concurrent.Ref$State@33fef449) to class org.apache.cassandra.io.util.FileHandle$Cleanup@1098210945:/data/cassandra/data/elvisevallogks/decision_detail-7351f6205f3811ea922ce1efeeba3e49/md-3695-big-Index.db was not released before the reference was garbage collected
ERROR [CompactionExecutor:3762] 2020-11-02 02:34:53,208 CassandraDaemon.java:228 - Exception in thread Thread[CompactionExecutor:3762,1,main]
org.apache.cassandra.io.FSReadError: java.io.IOException: Map failed
at org.apache.cassandra.io.util.ChannelProxy.map(ChannelProxy.java:157) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.util.MmappedRegions$State.add(MmappedRegions.java:310) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.util.MmappedRegions$State.access$400(MmappedRegions.java:246) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.util.MmappedRegions.updateState(MmappedRegions.java:181) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.util.MmappedRegions.<init>(MmappedRegions.java:73) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.util.MmappedRegions.<init>(MmappedRegions.java:61) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.util.MmappedRegions.map(MmappedRegions.java:104) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.util.FileHandle$Builder.complete(FileHandle.java:362) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.sstable.format.big.BigTableWriter.openEarly(BigTableWriter.java:290) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.sstable.SSTableRewriter.maybeReopenEarly(SSTableRewriter.java:180) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.io.sstable.SSTableRewriter.append(SSTableRewriter.java:135) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.db.compaction.writers.DefaultCompactionWriter.realAppend(DefaultCompactionWriter.java:65) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.db.compaction.writers.CompactionAwareWriter.append(CompactionAwareWriter.java:142) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.db.compaction.CompactionTask.runMayThrow(CompactionTask.java:201) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:85) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:61) ~[apache-cassandra-3.11.5.jar:3.11.5]
at org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionCandidate.run(CompactionManager.java:268) ~[apache-cassandra-3.11.5.jar:3.11.5]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_60]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_60]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_60]
at org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:84) [apache-cassandra-3.11.5.jar:3.11.5]
at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]
Caused by: java.io.IOException: Map failed
at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:939) ~[na:1.8.0_60]
at org.apache.cassandra.io.util.ChannelProxy.map(ChannelProxy.java:153) ~[apache-cassandra-3.11.5.jar:3.11.5]
... 23 common frames omitted
Caused by: java.lang.OutOfMemoryError: Map failed
at sun.nio.ch.FileChannelImpl.map0(Native Method) ~[na:1.8.0_60]
at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:936) ~[na:1.8.0_60]
... 24 common frames omitted
INFO [Service Thread] 2020-11-02 02:34:53,877 StatusLogger.java:51 - MemtablePostFlush 0 0 3596 0 0
cat /proc/25586/limits
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 0 0 bytes
Max resident set unlimited unlimited bytes
Max processes 65535 692334 processes
Max open files 655350 655350 files
Max locked memory unlimited unlimited bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 692334 692334 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
sysctl vm.max_map_count
vm.max_map_count = 1048575
节点没有崩溃，但我尝试连接时会出现随机超时。您可能需要检查并启用磁盘访问模式，从默认的“标准”模式到“仅mmap索引”，它通过使用仅映射索引文件避免了页面错误。页面错误有时会导致内存泄漏，建议根据集群利用率将堆硬编码为特定大小 问题是，当堆的默认值为32或更高时，会使堆中的许多对象的压缩变松，并且它的性能也不会很好，因此，当您有机会滚动重新启动时，这两个更改将很好地结合在一起 谢谢，
甘尼什谢谢你。我实现了更改，集群看起来很健康，我再也看不到那个错误了。
sysctl vm.max_map_count
vm.max_map_count = 1048575