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https://issues.apache.org/jira/browse/HDFS-11760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15997841#comment-15997841
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Reid Chan edited comment on HDFS-11760 at 5/5/17 10:14 AM:
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There's no unit test for this patch.
was (Author: reidchan):
There's no unit test.
> Make CHECK_CANCEL_INTERVAL configurable
> ---------------------------------------
>
> Key: HDFS-11760
> URL: https://issues.apache.org/jira/browse/HDFS-11760
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.7.0, 2.7.1, 2.7.2, 2.7.3, 3.0.0-alpha1, 3.0.0-alpha2
> Reporter: Reid Chan
> Priority: Minor
> Attachments: HDFS-11760-trunk.001.patch, HDFS-11760-trunk.002.patch,
> HDFS-11760-trunk.003.patch
>
>
> There's a case in my company: when two namenodes tried to transit state,
> checkpoint took place in standbynode and it didn't check cancellation until
> every after 4096 inodes saved, which took too much time between checks in our
> case and caused state transition fail at the end. After we changed it to 50,
> state transition succeed.
> The *CHECK_CANCEL_INTERVAL* in *FSImageFormat.Saver* was introduced in
> HDFS-7097 and set to 4096, previously was 50. There may be some reasons for
> the choice of 4096, but i'm not sure that, so I suggest to make it
> configurable.
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