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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-4633) Potential memory leak in client RPC timeout mechanism
Date Wed, 16 Nov 2016 21:02:59 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack resolved HBASE-4633.
--------------------------
    Resolution: Cannot Reproduce

RPC is very different now. Resolving as cannot repro.

> Potential memory leak in client RPC timeout mechanism
> -----------------------------------------------------
>
>                 Key: HBASE-4633
>                 URL: https://issues.apache.org/jira/browse/HBASE-4633
>             Project: HBase
>          Issue Type: Bug
>          Components: Client
>    Affects Versions: 0.90.3
>         Environment: HBase version: 0.90.3 + Patches , Hadoop version: CDH3u0
>            Reporter: Shrijeet Paliwal
>         Attachments: HBaseclientstack.png
>
>
> 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
> note , the same behavior is not observed in 'not so busy
> cluster.
> The patch is here : https://gist.github.com/1288023



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