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https://issues.apache.org/jira/browse/HDFS-13831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16595249#comment-16595249
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Wei-Chiu Chuang commented on HDFS-13831:
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+1 from me too. The description in core-default.xml can be reworded to make it
more clear for administrators. But I am okay with that.
Cherrypicking it into branch-3.1 and branch-3.0
> 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
> Fix For: 2.10.0, 3.2.0
>
> Attachments: HDFS-13831.001.patch, HDFS-13831.002.patch,
> HDFS-13831.003.patch, HDFS-13831.004.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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