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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11339) Support File IO sampling for Datanode IO profiling hooks
Date Tue, 17 Jan 2017 07:07:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15825567#comment-15825567

Arpit Agarwal commented on HDFS-11339:

Pushed an addendum commit to trunk to fix an import, noticed it while cherry-picking to branch-2.

-import org.jboss.netty.util.internal.ThreadLocalRandom;

 import javax.annotation.Nullable;
+import java.util.concurrent.ThreadLocalRandom;

> Support File IO sampling for Datanode IO profiling hooks
> --------------------------------------------------------
>                 Key: HDFS-11339
>                 URL: https://issues.apache.org/jira/browse/HDFS-11339
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Hanisha Koneru
>            Assignee: Hanisha Koneru
>             Fix For: 2.9.0, 3.0.0-alpha2
>         Attachments: HDFS-11339.000.patch, HDFS-11339.001.patch, HDFS-11339.002.patch,
> HDFS-10958 introduces instrumentation hooks around DataNode disk IO and HDFS-10959 adds
support for profiling hooks to expose latency statistics. 
> Instead of profiling all the file IO events, we can sample a fraction of the events and
profile them. The fraction to be sampled can be configurable.

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