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https://issues.apache.org/jira/browse/HADOOP-3617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12607080#action_12607080
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Chris Douglas commented on HADOOP-3617:
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The failing test, dfs.TestDatanodeDeath.testDatanodeDeath, is not related.
> Writes from map serialization include redundant checks for accounting space
> ---------------------------------------------------------------------------
>
> Key: HADOOP-3617
> URL: https://issues.apache.org/jira/browse/HADOOP-3617
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Affects Versions: 0.17.0
> Reporter: Chris Douglas
> Assignee: Chris Douglas
> Fix For: 0.19.0
>
> Attachments: 3617-0.patch
>
>
> In BlockingBuffer::write, the collector verifies that there is sufficient
> space to hold metadata when it returns to MapOutputBuffer::collect. This
> check is redundant for serialized records that make more than one call to
> write.
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