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From "Jonathan Eagles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12591) [READ] Implement LevelDBFileRegionFormat
Date Wed, 04 Oct 2017 20:46:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16192007#comment-16192007
] 

Jonathan Eagles commented on HDFS-12591:
----------------------------------------

I can't comment regarding the whole of the jira, but it looks like there is a memory leak
introduced by calling DBIterator.iterator() without calling close. Similar to work done in
YARN-5368

> [READ] Implement LevelDBFileRegionFormat
> ----------------------------------------
>
>                 Key: HDFS-12591
>                 URL: https://issues.apache.org/jira/browse/HDFS-12591
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs
>            Reporter: Ewan Higgs
>            Priority: Minor
>         Attachments: HDFS-12591-HDFS-9806.001.patch
>
>
> The existing work for HDFS-9806 uses an implementation of the {{FileRegion}} read from
a csv file. This is good for testability and diagnostic purposes, but it is not very efficient
for larger systems.
> There should be a version that is similar to the {{TextFileRegionFormat}} that instead
uses LevelDB.



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