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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8868) add metric to report client shortcircuit reads
Date Thu, 04 Jul 2013 17:05:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13700220#comment-13700220
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ramkrishna.s.vasudevan commented on HBASE-8868:
-----------------------------------------------

One problem here could be that since the shortcircuit read is done by the DFSClient on the
HDFS side will we get some direct metrics on this? Let me see.
But if we want the checksum metrics that can be done because HBase explicitly switches to
DFS checksum if its own checksum fails.
                
> add metric to report client shortcircuit reads
> ----------------------------------------------
>
>                 Key: HBASE-8868
>                 URL: https://issues.apache.org/jira/browse/HBASE-8868
>             Project: HBase
>          Issue Type: Improvement
>          Components: metrics, regionserver
>    Affects Versions: 0.94.8, 0.95.1
>            Reporter: Viral Bajaria
>            Priority: Minor
>
> With the availability of shortcircuit reads, when the feature is enabled there is no
metric which exposes how many times the regionserver was able to shortcircuit the read and
not make a IPC to the datanode.
> It will be great to add the metric and expose it via Ganglia.

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