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https://issues.apache.org/jira/browse/HDFS-12809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16293601#comment-16293601
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Hudson commented on HDFS-12809:
-------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #13391 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/13391/])
HDFS-12809. [READ] Fix the randomized selection of locations in (cdouglas: rev
4d59dabb7f6ef1d8565bf2bb2d38aeb91bf7f7cc)
* (edit)
hadoop-tools/hadoop-fs2img/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeProvidedImplementation.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/ProvidedStorageMap.java
> [READ] Fix the randomized selection of locations in {{ProvidedBlocksBuilder}}.
> ------------------------------------------------------------------------------
>
> Key: HDFS-12809
> URL: https://issues.apache.org/jira/browse/HDFS-12809
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Virajith Jalaparti
> Assignee: Virajith Jalaparti
> Attachments: HDFS-12809-HDFS-9806.001.patch,
> HDFS-12809-HDFS-9806.002.patch
>
>
> Calling {{getBlockLocations}} on files that have a PROVIDED replica, results
> in the datanode locations being selected at random. Currently, this
> randomization uses the datanode uuids to pick a node at random
> ({{ProvidedDescriptor#choose}}, {{ProvidedDescriptor#chooseRandom}}).
> Depending on the distribution of the datanode UUIDs, this can lead to large
> number of iterations (which may not terminate) before a location is chosen.
> This JIRA aims to replace this with a more efficient randomization strategy.
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