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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11789) Maintain Short-Circuit Read Statistics
Date Thu, 22 Jun 2017 18:28:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16059822#comment-16059822
] 

Arpit Agarwal commented on HDFS-11789:
--------------------------------------

+1 for the v05 patch, pending Jenkins.

> Maintain Short-Circuit Read Statistics
> --------------------------------------
>
>                 Key: HDFS-11789
>                 URL: https://issues.apache.org/jira/browse/HDFS-11789
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>            Reporter: Hanisha Koneru
>            Assignee: Hanisha Koneru
>         Attachments: HDFS-11789.001.patch, HDFS-11789.002.patch, HDFS-11789.003.patch,
HDFS-11789.004.patch, HDFS-11789.005.patch
>
>
> If a disk or controller hardware is faulty then short-circuit read requests can stall
indefinitely while reading from the file descriptor. Currently there is no way to detect when
short-circuit read requests are slow or blocked. 
> This Jira proposes that each BlockReaderLocal maintain read statistics while it is active
by measuring the time taken for a pre-determined fraction of read requests. These per-reader
stats can be aggregated into global stats when the reader is closed. The aggregate statistics
can be exposed via JMX.



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