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https://issues.apache.org/jira/browse/HDFS-11299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15815844#comment-15815844
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Arpit Agarwal edited comment on HDFS-11299 at 1/10/17 6:54 PM:
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The test case failure is unrelated and the checkstyle warning can be ignored
(the 'unused' import is referenced from a Javadoc comment).
was (Author: arpitagarwal):
The test case failure is unrelated and the checkstyle warning can be removed
(the 'unused' import is referenced from a Javadoc comment).
> 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
> Fix For: 3.0.0-alpha2
>
> 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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