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From "Virajith Jalaparti (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12591) [READ] Implement LevelDBFileRegionFormat
Date Fri, 01 Dec 2017 03:05:01 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Virajith Jalaparti updated HDFS-12591:
--------------------------------------
    Attachment: HDFS-12591-HDFS-9806.004.patch

Posting a new patch (v4) that rebases v3 on the latest feature branch, and removes the shared
reference to the leveldb between {{LevelDBReader}} and {{LevelDBWriter}}. The reader and writer
are not intended to be used simultaneously as provided storage just supports read-only as
of now (hence, removed {{testSimultaneousWriteAndRead}}). [~ehiggs], can you take a look at
this?

> [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
>            Assignee: Ewan Higgs
>            Priority: Minor
>         Attachments: HDFS-12591-HDFS-9806.001.patch, HDFS-12591-HDFS-9806.002.patch,
HDFS-12591-HDFS-9806.003.patch, HDFS-12591-HDFS-9806.004.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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