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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11634) Optimize BlockIterator when interating starts in the middle.
Date Thu, 13 Apr 2017 22:27:41 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11634?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Konstantin Shvachko updated HDFS-11634:
---------------------------------------
    Attachment: HDFS-11643.005.patch

Agreed, since we never iterate backwards, we don't need iterators from skipped storges.
Latest patch addresses both of your comments guys. Plus I simplified the test and made it
verify all possible combinations.

> 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, HDFS-11634.002.patch, HDFS-11634.003.patch,
HDFS-11634.004.patch, HDFS-11643.005.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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