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https://issues.apache.org/jira/browse/HDFS-17812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18009434#comment-18009434
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ASF GitHub Bot commented on HDFS-17812:
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kokonguyen191 opened a new pull request, #7826:
URL: https://github.com/apache/hadoop/pull/7826
### Description of PR
1. BlockIteratorImpl#getSubdirEntries sorts by strings, meaning subdir29
comes before subdir4, which can result in a bigger block id being listed before
a smaller block id
2. If block cleanup happens before state.curEntry is reset to null, stale
data can carry over into the next loop
3. Search for a bigger ID than the range in nextSorted(entries,
state.curEntry) -> null -> subdir is skipped.
Usually happens during DiskBalancer operations.
### How was this patch tested?
UT
> BlockIteratorImpl can miss blocks under certain conditions
> ----------------------------------------------------------
>
> Key: HDFS-17812
> URL: https://issues.apache.org/jira/browse/HDFS-17812
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Felix N
> Assignee: Felix N
> Priority: Minor
>
> # BlockIteratorImpl#getSubdirEntries sorts by strings, meaning subdir20 comes
> before subdir4, which can result in a bigger block id being listed before a
> smaller block id
> # If block cleanup happens before state.curEntry is reset to null, stale
> data can carry over into the next loop
> # Search for a bigger ID than the range in nextSorted(entries,
> state.curEntry) -> null -> subdir is skipped.
> Usually happens during DiskBalancer operations.
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