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From "Xiaoyu Yao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11299) Support multiple Datanode File IO hooks
Date Mon, 09 Jan 2017 22:14:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15813013#comment-15813013
] 

Xiaoyu Yao commented on HDFS-11299:
-----------------------------------

Thanks [~hanishakoneru] for updating the patch and [~arpitagarwal] for the review. 

Looks like LEN_INT can be replaced with Integer.BYTES from JDK. But Integer.BYTES is only
available in JDK1.8. It will cause more work when backporting it to branch-2. 
I'm OK with the patch v02. +1 pending Jenkins.

> Support multiple Datanode File IO hooks
> ---------------------------------------
>
>                 Key: HDFS-11299
>                 URL: https://issues.apache.org/jira/browse/HDFS-11299
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs
>            Reporter: Hanisha Koneru
>            Assignee: Hanisha Koneru
>         Attachments: HDFS-11299.000.patch, HDFS-11299.001.patch, HDFS-11299.002.patch
>
>
> HDFS-10958 introduces instrumentation hooks around DataNode disk IO and HDFS-10959 adds
support for profiling hooks to expose latency statistics. 
> Instead of choosing only one hook using Config parameters, we want to add two separate
hooks - one for profiling and one for fault injection. The fault injection hook will be useful
for testing purposes. 
> This jira only introduces support for fault injection hook. The implementation for that
will come later on.
> Also, now Default and Counting FileIOEvents would not be needed as we can control enabling
the profiling and fault injection hooks using config parameters.



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