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Posted to commits@cassandra.apache.org by "Pankaj Kumar (Jira)" <ji...@apache.org> on 2020/07/02 12:15:00 UTC

[jira] [Created] (CASSANDRA-15917) LEAK Detected in Cassandra

Pankaj Kumar created CASSANDRA-15917:
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             Summary: LEAK Detected in Cassandra
                 Key: CASSANDRA-15917
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15917
             Project: Cassandra
          Issue Type: Bug
            Reporter: Pankaj Kumar


Hi

We are using cassandra docker environment. So 1 out of 3 cassandra, cassandra docker is restarting continuously. This issue is happening in production setup. 

Then checked system logs and debug logs and found these traceback occur multiple times
ERROR [Reference-Reaper] 2020-06-29 14:40:20,800 Ref.java:229 - LEAK DETECTED: a reference (org.apache.cassandra.utils.concurrent.Ref$State@53581121) to class org.apache.cassandra.io.util.MmappedRegions$Tidier@194489638:/var/lib/cassandra/data/system_schema/indexes-0feb57ac311f382fba6d9024d305702f/md-626-big-Index.db was not released before the reference was garbage collectedDEBUG [SSTableBatchOpen:8] 2020-06-29 14:40:23,698 SSTableReader.java:515 - Opening /var/lib/cassandra/data/system_schema/indexes-0feb57ac311f382fba6d9024d305702f/md-240-big (0.050KiB)ERROR [SSTableBatchOpen:5] 2020-06-29 14:40:20,801 DebuggableThreadPoolExecutor.java:239 - Error in ThreadPoolExecutor
java.lang.NullPointerException: null
        at org.apache.cassandra.io.sstable.format.SSTableReader.getFilename(SSTableReader.java:697) ~[apache-cassandra-3.11.5.jar:3.11.5]
        at org.apache.cassandra.io.sstable.format.SSTableReader.open(SSTableReader.java:543) ~[apache-cassandra-3.11.5.jar:3.11.5]
        at org.apache.cassandra.io.sstable.format.SSTableReader.open(SSTableReader.java:385) ~[apache-cassandra-3.11.5.jar:3.11.5]
        at org.apache.cassandra.io.sstable.format.SSTableReader$3.run(SSTableReader.java:570) ~[apache-cassandra-3.11.5.jar:3.11.5]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_232]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_232]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[na:1.8.0_232]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_232]
        at org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:84) [apache-cassandra-3.11.5.jar:3.11.5]
        at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_232]



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