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https://issues.apache.org/jira/browse/HDFS-1122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12930493#action_12930493
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sam rash commented on HDFS-1122:
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it looks it does exist--has the same problem that if a BlockSender sends all
the data for an open block, it gets added to the block scanner.
oddly, in retrospect, this doesn't produce an error since the DataBlockScanner
itself is just another concurrent reader
(it does produce the warnings of adding a block more than once)
> client block verification may result in blocks in DataBlockScanner prematurely
> ------------------------------------------------------------------------------
>
> Key: HDFS-1122
> URL: https://issues.apache.org/jira/browse/HDFS-1122
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: 0.20-append
> Reporter: sam rash
> Assignee: sam rash
> Attachments: hdfs-1122-for-0.20.txt
>
>
> found that when the DN uses client verification of a block that is open for
> writing, it will add it to the DataBlockScanner prematurely.
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