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https://issues.apache.org/jira/browse/HBASE-8868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17075051#comment-17075051
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Anoop Sam John commented on HBASE-8868:
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bq.Because HDFS ReadStatistics is calculated per input stream, it is not
feasible to update the aggregated number in real time. Instead, the metrics are
updated when an input stream is closed.
Means when some files are getting compacted away and got closed, then only the
metric associated with that will get include into the metric system. Correct?
> 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
> Assignee: Wei-Chiu Chuang
> Priority: Minor
> Fix For: 3.0.0, 2.3.0
>
> Attachments: HBASE-8868.master.001.patch
>
>
> 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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