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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: Potential memory leak in client RPC timeout mechanism
Date Mon, 17 Oct 2011 17:09:38 GMT
We aren't running with those patches, but would it be possible for you to
heap dump one client? At least we would see exactly what's eating all the



On Fri, Oct 14, 2011 at 12:12 PM, Shrijeet Paliwal

> Hi All,
> HBase version: 0.90.3 + Patches
> Hadoop version: CDH3u0
> Relevant Jiras: https://issues.apache.org/jira/browse/HBASE-2937,
> https://issues.apache.org/jira/browse/HBASE-4003
> We have been using the 'hbase.client.operation.timeout' knob
> introduced in 2937 for quite some time now. It helps us enforce SLA.
> We have two HBase clusters and two HBase client clusters. One of them
> is much busier than the other.
> We have seen a deterministic behavior of clients running in busy
> cluster. Their (client's) memory footprint increases consistently
> after they have been up for roughly 24 hours.
> This memory footprint almost doubles from its usual value (usual case
> == RPC timeout disabled). After much investigation nothing concrete
> came out and we had to put a hack
> which keep heap size in control even when RPC timeout is enabled. Also
> please note , the same behavior is not observed in 'not so busy
> cluster.
> The patch is here : https://gist.github.com/1288023
> Can some one, who is also running RPC timeout in production under fair
> load, please share the experience.
> -Shrijeet

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