Virajith Jalaparti created HDFS-12809:
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Summary: [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
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 before a location is chosen. This JIRA aims to replace this with a
more efficient randomization strategy.
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