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https://issues.apache.org/jira/browse/HDFS-15574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stephen O'Donnell reopened HDFS-15574:
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Reopening to backport to earlier branches.
> Remove unnecessary sort of block list in DirectoryScanner
> ---------------------------------------------------------
>
> Key: HDFS-15574
> URL: https://issues.apache.org/jira/browse/HDFS-15574
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 3.4.0
> Reporter: Stephen O'Donnell
> Assignee: Stephen O'Donnell
> Priority: Major
> Fix For: 3.4.0
>
> Attachments: HDFS-15574.001.patch, HDFS-15574.002.patch,
> HDFS-15574.003.patch
>
>
> These lines of code in DirectoryScanner#scan(), obtain a snapshot of the
> finalized blocks from memory, and then sort them, under the DN lock. However
> the blocks are stored in a sorted structure (FoldedTreeSet) and hence the
> sort should be unnecessary.
> {code}
> final List<ReplicaInfo> bl = dataset.getFinalizedBlocks(bpid);
> Collections.sort(bl); // Sort based on blockId
> {code}
> This Jira removes the sort, and renames the getFinalizedBlocks to
> getSortedFinalizedBlocks to make the intent of the method more clear.
> Also added a test, just in case the underlying block structure is ever
> changed to something unsorted.
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