[jira] [Updated] (HBASE-15160) Put back HFile's HDFS op latency sampling code and add metrics for monitoring

["Enis Soztutar (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-15160?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Enis Soztutar updated HBASE-15160:
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    Attachment: hbase-15160_v4.patch

I was finally able to get to this. v4 changes Yu's patch, so that we update the latency histograms inline (see the parent jira for some micro-benchmark results). 

The metrics are also moved to a new metric sub class called IO. 

> Put back HFile's HDFS op latency sampling code and add metrics for monitoring
> -----------------------------------------------------------------------------
>
>                 Key: HBASE-15160
>                 URL: https://issues.apache.org/jira/browse/HBASE-15160
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 2.0.0, 1.1.2
>            Reporter: Yu Li
>            Assignee: Yu Li
>         Attachments: HBASE-15160.patch, HBASE-15160_v2.patch, HBASE-15160_v3.patch, hbase-15160_v4.patch
>
>
> In HBASE-11586 all HDFS op latency sampling code, including fsReadLatency, fsPreadLatency and fsWriteLatency, have been removed. There was some discussion about putting them back in a new JIRA but never happened. According to our experience, these metrics are useful to judge whether issue lies on HDFS when slow request occurs, so we propose to put them back in this JIRA, and add the metrics for monitoring as well.



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