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https://issues.apache.org/jira/browse/HDFS-3256?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron T. Myers updated HDFS-3256:
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Attachment: HDFS-3256.patch
Great catch, Todd.
Here's an updated patch which will only call processMisReplicatedBlocks when
becoming multi-rack if the NN is not in safemode and not in standby state. This
behavior is a tad more conservative than the check that's done in the SafeMode
class, but that seems fine. If the cluster becomes multi-rack while in safmode
or standby state, we're guaranteed that processMisReplicatedBlocks will be
called when the NN exits safemode or becomes active.
> 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 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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