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https://issues.apache.org/jira/browse/HDFS-10271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15236627#comment-15236627
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Vinayakumar B commented on HDFS-10271:
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This seems to be a pretty straight-forward bug.
Simple Append op releases more reserved space than it actually should.
Thanks [~brahmareddy] for nice find.
+1 for the patch.
I will commit it shortly.
> Extra bytes are getting released from reservedSpace for append
> --------------------------------------------------------------
>
> Key: HDFS-10271
> URL: https://issues.apache.org/jira/browse/HDFS-10271
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Brahma Reddy Battula
> Assignee: Brahma Reddy Battula
> Priority: Critical
> Attachments: HDFS-10271-01.patch, HDFS-10271-branch-2.7-01.patch
>
>
> 1. File already have some bytes available in block. (ex: 1024B)
> 2. Re-open the file for append, (Here reserving for (BlockSize-1024) bytes)
> 3. write one byte and flush,
> 4. close()
> After close(), releasing *BlockSize-1* bytes from reservedspace instead of
> *BlockSize-1025* bytes.
> Extra bytes reserved may create problem for other writers.
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