[jira] [Assigned] (HBASE-3565) Add a metric to keep track of slow HLog appends

["Zhihong Yu (Assigned) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-3565?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zhihong Yu reassigned HBASE-3565:
---------------------------------

    Assignee: Zhihong Yu
    
> Add a metric to keep track of slow HLog appends
> -----------------------------------------------
>
>                 Key: HBASE-3565
>                 URL: https://issues.apache.org/jira/browse/HBASE-3565
>             Project: HBase
>          Issue Type: Improvement
>          Components: metrics, regionserver
>            Reporter: Benoit Sigoure
>            Assignee: Zhihong Yu
>              Labels: monitoring
>             Fix For: 0.94.0
>
>         Attachments: HBASE-3565.trunk.v1.patch
>
>
> Whenever an edit takes too long to be written to an HLog, HBase logs a warning such as this one:
> {code}
> 2011-02-23 20:03:14,703 WARN org.apache.hadoop.hbase.regionserver.wal.HLog: IPC Server handler 21 on 60020 took 15065ms appending an edit to hlog; editcount=126050
> {code}
> I would like to have a counter incremented each time this happens and this counter exposed via the metrics stuff in HBase so I can collect it in my monitoring system.

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