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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3650) Use MutableQuantiles to provide latency histograms for various operations
Date Wed, 18 Jul 2012 00:09:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13416748#comment-13416748
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Andrew Wang commented on HDFS-3650:
-----------------------------------

I think the testcase failures are unrelated, even though there are a lot of them.

TestZKFailoverController, TestTFile* (HADOOP-8537), TestNameNodeMetrics (HDFS-2434) are reported
flaky.

TestMetricsSystemImpl, TestReplication, TestPersistBlocks, I ran locally and passed.
                
> 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
>
>
> 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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