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From "Virajith Jalaparti (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12809) [READ] Fix the randomized selection of locations in {{ProvidedBlocksBuilder}}.
Date Mon, 27 Nov 2017 21:36:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16267605#comment-16267605
] 

Virajith Jalaparti commented on HDFS-12809:
-------------------------------------------

[~elgoiri] - did it in v2 of the patch. Waiting on jenkins to come back...

> [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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