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https://issues.apache.org/jira/browse/HDFS-12887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16277739#comment-16277739
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Virajith Jalaparti commented on HDFS-12887:
-------------------------------------------
This fix ensures that Datanodes can start successfully in the following
scenario:
# Datanode DN1 is configured with {{PROVIDED}} and {{DISK}} volumes.
# Increase in replication on a (provided) file containing block {{i}} leads to
DN1 moving block {{i}} from {{PROVIDED}} volume to the {{DISK}} volume.
# DN1 goes down.
# DN1 starts up, and finds block with id {{i}} on both the {{DISK}} and
{{PROVIDED}} volumes and *fails to start* ({{IOException}} is thrown in
{{ProvidedBlockPoolSlice.fetchVolumeMap}}).
This scenario can be avoided once HDFS-9810 is completed.
> [READ] Allow Datanodes with Provided volumes to start when blocks with the
> same id exist locally
> ------------------------------------------------------------------------------------------------
>
> Key: HDFS-12887
> URL: https://issues.apache.org/jira/browse/HDFS-12887
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Virajith Jalaparti
> Assignee: Virajith Jalaparti
>
> Fix {{ProvidedVolumeImpl.getVolumeMap}} to not throw an exception even when
> an existing block in the volumemap has the same id.
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