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Posted to issues@hbase.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2014/02/14 00:52:23 UTC

[jira] [Commented] (HBASE-10212) New rpc metric: number of active handler

    [ https://issues.apache.org/jira/browse/HBASE-10212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13900911#comment-13900911 ] 

Ted Yu commented on HBASE-10212:
--------------------------------

TestRpcMetrics passes with patch.

> New rpc metric: number of active handler
> ----------------------------------------
>
>                 Key: HBASE-10212
>                 URL: https://issues.apache.org/jira/browse/HBASE-10212
>             Project: HBase
>          Issue Type: Improvement
>          Components: IPC/RPC
>            Reporter: Chao Shi
>            Assignee: Chao Shi
>         Attachments: hbase-10212.patch
>
>
> The attached patch adds a new metric: number of active handler threads. We found this is a good metric to measure how busy of a server. If this number is too high (compared to the total number of handlers), the server has risks in getting call queue full.
> We used to monitor  # reads or # writes. However we found this often produce false alerts, because a read touching HDFS will produce much high workload than a block-cached read.
> The attached patch is based on our internal 0.94 branch, but I think it pretty easy to port to rebase to other branches if you think it is useful.



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