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From "5feixiang (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (HDFS-11171) Add localBytesRead and localReadTime for datanode metrics to calculate local read rate which is useful to compare .
Date Thu, 24 Nov 2016 07:18:58 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

5feixiang reopened HDFS-11171:
------------------------------

> Add localBytesRead and localReadTime for datanode metrics to calculate local read rate
which is useful to compare .
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-11171
>                 URL: https://issues.apache.org/jira/browse/HDFS-11171
>             Project: Hadoop HDFS
>          Issue Type: Wish
>          Components: datanode
>            Reporter: 5feixiang
>            Priority: Minor
>              Labels: metrics
>         Attachments: localReadMetrics.patch
>
>
> Current dfs context metrics only contains bytesRead ,remoteBytesRead and totalReadTime.We
can find  that bytesRead= remoteBytesRead +balance remote copyBytesRead+localBytesRead, so
we can add  localBytesRead and localReadTime to calcute local read rate which is usefu to
compate local read rate between short-circuit read and tcp-socket read.



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