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https://issues.apache.org/jira/browse/HDFS-13831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16590024#comment-16590024
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Ryan Wu commented on HDFS-13831:
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Thx [~linyiqun]. I have updated the patch and add the error-checking logic to
ensure block-increment-deletion
a positive integer. Moreover, we don't need to add the new test since the
_TestLargeDirectoryDelete_ already __ covers the scenario_. S_o, I just set
the block-increment-deletion via configuration in _TestLargeDirectoryDelete._
> Make block increment deletion number configurable
> -------------------------------------------------
>
> Key: HDFS-13831
> URL: https://issues.apache.org/jira/browse/HDFS-13831
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 3.1.0
> Reporter: Yiqun Lin
> Assignee: Ryan Wu
> Priority: Major
> Attachments: HDFS-13831.001.patch, HDFS-13831.002.patch,
> HDFS-13831.003.patch
>
>
> When NN deletes a large directory, it will hold the write lock long time. For
> improving this, we remove the blocks in a batch way. So that other waiters
> have a chance to get the lock. But right now, the batch number is a
> hard-coded value.
> {code}
> static int BLOCK_DELETION_INCREMENT = 1000;
> {code}
> We can make this value configurable, so that we can control the frequency of
> other waiters to get the lock chance.
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