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https://issues.apache.org/jira/browse/HDFS-3256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252787#comment-13252787
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Aaron T. Myers commented on HDFS-3256:
--------------------------------------
In investigating the TestBlocksWithNotEnoughRacks failure, I came across a bug
in one of the test util methods, filed here: HDFS-3266 and Todd found another
issue with TestBlocksWithNotEnoughRacks specifically, filed here: HDFS-3267
I've been looping TestBlocksWithNotEnoughRacks for an hour now, with no
failures.
I'm pretty confident that the TestLeaseRecovery2 failure is this JIRA: HDFS-3181
I've also been looping TestLeaseRecovery2 now for a few minutes and haven't had
any failures.
> HDFS considers blocks under-replicated if topology script is configured with
> only 1 rack
> ----------------------------------------------------------------------------------------
>
> Key: HDFS-3256
> URL: https://issues.apache.org/jira/browse/HDFS-3256
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: Aaron T. Myers
> Assignee: Aaron T. Myers
> Attachments: HDFS-3256.patch, HDFS-3256.patch, HDFS-3256.patch,
> HDFS-3256.patch, HDFS-3256.patch, HDFS-3256.patch
>
>
> HDFS treats the mere presence of a topology script being configured as
> evidence that there are multiple racks. If there is in fact only a single
> rack, the NN will try to place the blocks on at least two racks, and thus
> blocks will be considered to be under-replicated.
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