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https://issues.apache.org/jira/browse/HDFS-11299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15812955#comment-15812955
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Arpit Agarwal commented on HDFS-11299:
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Thanks [~hanishakoneru].
+1 pending Jenkins. Looks like Xiaoyu's feedback is also addressed but will
hold off committing until tomorrow in case he has more feedback.
> 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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