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https://issues.apache.org/jira/browse/HDFS-13048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16338824#comment-16338824
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Akira Ajisaka commented on HDFS-13048:
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The test case shows how the metric becomes negative. Without the fix, if a
block is added to LowRedundancyBlocks with corrupt_blocks priority and removed
with low_redundancy priority, the counter for corrupt_block is not decremented.
> LowRedundancyReplicatedBlocks metric can be negative
> ----------------------------------------------------
>
> Key: HDFS-13048
> URL: https://issues.apache.org/jira/browse/HDFS-13048
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: metrics
> Affects Versions: 3.0.0
> Reporter: Akira Ajisaka
> Assignee: Akira Ajisaka
> Priority: Major
> Attachments: HDFS-13048-sample.patch, HDFS-13048.001.patch,
> HDFS-13048.002.patch
>
>
> I'm seeing {{LowRedundancyReplicatedBlocks}} become negative. This should be
> 0 or positive.
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