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From "5feixiang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11171) add metric to report client shortcircuit reads for datanode metrics to calculate local read rate which is useful to compare .
Date Fri, 25 Nov 2016 10:40:58 GMT

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

5feixiang updated HDFS-11171:
-----------------------------
    Summary: add metric to report client shortcircuit reads for datanode metrics to calculate
local read rate which is useful to compare .  (was: Add localBytesRead and localReadTime for
datanode metrics to calculate local read rate which is useful to compare .)

> add metric to report client shortcircuit reads 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: Improvement
>          Components: datanode
>    Affects Versions: 2.7.1
>            Reporter: 5feixiang
>              Labels: metrics
>             Fix For: 2.7.1
>
>
> 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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