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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3650) Use MutableQuantiles to provide latency histograms for various operations
Date Fri, 27 Jul 2012 00:01:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423573#comment-13423573

Aaron T. Myers commented on HDFS-3650:

The latest patch looks great to me, Andrew. One tiny nit: in testRoundTripAckMetric in one
place you do a "assertTrue(x != null)". Instead of this, you can just do "assertNotNull(x)".

+1 once this is addressed.
> Use MutableQuantiles to provide latency histograms for various operations
> -------------------------------------------------------------------------
>                 Key: HDFS-3650
>                 URL: https://issues.apache.org/jira/browse/HDFS-3650
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.0.0-alpha
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>         Attachments: hdfs-3650-1.patch, hdfs-3650-2.patch
> MutableQuantiles provide accurate estimation of various percentiles for a stream of data.
Many existing metrics reported by a MutableRate would also benefit from having these percentiles;
lets add MutableQuantiles where we think it'd be useful.

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