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From "Rushabh S Shah (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11634) Optimize BlockIterator when interating starts in the middle.
Date Mon, 10 Apr 2017 15:45:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15963062#comment-15963062
] 

Rushabh S Shah commented on HDFS-11634:
---------------------------------------

Just FYI,
{{TestFsDatasetImpl.testLoadingDfsUsedForVolumes}} test failure is being tracked by HADOOP-14293

> Optimize BlockIterator when interating starts in the middle.
> ------------------------------------------------------------
>
>                 Key: HDFS-11634
>                 URL: https://issues.apache.org/jira/browse/HDFS-11634
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.6.5
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>         Attachments: HDFS-11634.001.patch
>
>
> {{BlockManager.getBlocksWithLocations()}} needs to iterate blocks from a randomly selected
{{startBlock}} index. It creates an iterator which points to the first block and then skips
all blocks until {{startBlock}}. It is inefficient when DN has multiple storages. Instead
of skipping blocks one by one we can skip entire storages. Should be more efficient on average.



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