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From "J.B. Langston (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-6047) Memory leak when using snapshot repairs
Date Tue, 17 Sep 2013 21:47:54 GMT
J.B. Langston created CASSANDRA-6047:

             Summary: Memory leak when using snapshot repairs
                 Key: CASSANDRA-6047
             Project: Cassandra
          Issue Type: Bug
            Reporter: J.B. Langston

Running nodetool repair repeatedly with the -snapshot parameter results in a native memory
leak. The JVM process will take up more and more physical memory until it is killed by the
Linux OOM killer.

The command used was as follows:

nodetool repair keyspace -local -snapshot -pr -st start_token -et end_token

Removing the -snapshot flag prevented the memory leak.  The subrange repair necessitated multiple
repairs, so it made the problem noticeable, but I believe the problem would be reproducible
even if you ran repair repeatedly without specifying a start and end token.

Notes from [~yukim]:

Probably the cause is too many snapshots. Snapshot sstables are opened during validation,
but memories used are freed when releaseReferences called. But since snapshots never get marked
compacted, memories never freed.

We only cleanup mmap'd memories when sstable is mark compacted.

Validation compaction never marks snapshots compacted.

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