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From "Vijay (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-5624) Memory leak in SerializingCache
Date Sat, 08 Jun 2013 16:58:21 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13678763#comment-13678763
] 

Vijay edited comment on CASSANDRA-5624 at 6/8/13 4:58 PM:
----------------------------------------------------------

Just started looking, One thing which i noticed immediately is that unreference can be called
twice.... 
{code}
    public void remove(K key)
    {
        RefCountedMemory mem = map.remove(key);
        if (mem != null)
            mem.unreference();
    }
{code}

remove then calls onEviction, same with put and replace.... above is not an issue in real
world, but the code which detect might not be accurate because of this...
                
      was (Author: vijay2win@yahoo.com):
    i take back my earlier comments :)
                  
> Memory leak in SerializingCache
> -------------------------------
>
>                 Key: CASSANDRA-5624
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5624
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.1.1
>            Reporter: Jonathan Ellis
>            Assignee: Ryan McGuire
>
> A customer reported a memory leak when off-heap row cache is enabled.
> I gave them a patch against 1.1.9 to troubleshoot (https://github.com/jbellis/cassandra/commits/row-cache-finalizer).
 This confirms that row cache is responsible.  Here is a sample of the log:
> {noformat}
> DEBUG [Finalizer] 2013-06-08 06:49:58,656 FreeableMemory.java (line 69) Unreachable memory
still has nonzero refcount 1
> DEBUG [Finalizer] 2013-06-08 06:49:58,656 FreeableMemory.java (line 71) Unreachable memory
140337996747792 has not been freed (will free now)
> DEBUG [Finalizer] 2013-06-08 06:49:58,656 FreeableMemory.java (line 69) Unreachable memory
still has nonzero refcount 1
> DEBUG [Finalizer] 2013-06-08 06:49:58,656 FreeableMemory.java (line 71) Unreachable memory
140337989287984 has not been freed (will free now)
> {noformat}
> That is, memory is not being freed because we never got to zero references.

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