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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HDFS-11461) DataNode Disk Outlier Detection
Date Tue, 28 Feb 2017 00:41:45 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15886922#comment-15886922
] 

Arpit Agarwal edited comment on HDFS-11461 at 2/28/17 12:40 AM:
----------------------------------------------------------------

[~hanishakoneru], a few comments:
# {{DataNode#shutdown}} should use slowDiskDetectionThread.join() instead of sleep.
# {{diskOutliers}} should maintain the mean read/write/meta latency for each flagged disk.
# The low threshold should be higher than 1ms (average seek latency of a 7200 RPM disk is
4ms). Let's conservatively set this to 20ms.
# startDiskOutlierDetectionThread should call Thread.currentThread().interrupt() after catching
InterruptedException. See https://www.ibm.com/developerworks/library/j-jtp05236/
# slowDiskDetectionThread should be a daemon thread.
# DataNodePeerMetrics should also use OutlierDetector constructor that accepts minNumResources,
and pass {{10}}, to keep the behavior consistent with what we have.


was (Author: arpitagarwal):
[~hanishakoneru], a few comments:
# {{DataNode#shutdown}} should use slowDiskDetectionThread.join() instead of sleep.
# {{diskOutliers}} should maintain the mean read/write/meta latency for each flagged disk.
# The low threshold should be higher than 1ms (seek latency of a 7200 RPM disk is 4ms). Let's
conservatively set this to 20ms.
# startDiskOutlierDetectionThread should call Thread.currentThread().interrupt() after catching
InterruptedException. See https://www.ibm.com/developerworks/library/j-jtp05236/
# slowDiskDetectionThread should be a daemon thread.
# DataNodePeerMetrics should also use OutlierDetector constructor that accepts minNumResources,
and pass {{10}}, to keep the behavior consistent with what we have.

> DataNode Disk Outlier Detection
> -------------------------------
>
>                 Key: HDFS-11461
>                 URL: https://issues.apache.org/jira/browse/HDFS-11461
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs
>            Reporter: Hanisha Koneru
>            Assignee: Hanisha Koneru
>         Attachments: HDFS-11461.000.patch
>
>
> Similar to how DataNodes collect peer performance statistics, we can collect disk performance
statistics per datanode and detect outliers among them, if any.



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