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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6673) Add Delimited format supports for PB OIV tool
Date Tue, 16 Dec 2014 02:22:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14247622#comment-14247622

Andrew Wang commented on HDFS-6673:

Hey Eddy, thanks for working on this. It looks good, I don't see any major issues, just some
small nits:

* Needs a small rebase
* DelimitedImageViewer class javadoc typos: "included" -> "included in", "can be" ->
"can be set"
* TextWriterImageViewer javadoc: IOExceptions -> IOException
* We need some unit tests. I bet we have some for the old image viewer which could be revived.

Since the purpose of this is all about large fsimages, have you tested this with a large FSImage,
and checked the memory usage / performance? Also curious how we tune the LevelDB caches and
write buffers, as described here: https://code.google.com/p/leveldb/source/browse/include/leveldb/options.h

I think since LevelDB does its own write caching, we could also remove that TODO about write

> Add Delimited format supports for PB OIV tool
> ---------------------------------------------
>                 Key: HDFS-6673
>                 URL: https://issues.apache.org/jira/browse/HDFS-6673
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: 2.4.0
>            Reporter: Lei (Eddy) Xu
>            Assignee: Lei (Eddy) Xu
>            Priority: Minor
>         Attachments: HDFS-6673.000.patch, HDFS-6673.001.patch, HDFS-6673.002.patch, HDFS-6673.003.patch
> The new oiv tool, which is designed for Protobuf fsimage, lacks a few features supported
in the old {{oiv}} tool. 
> This task adds supports of _Delimited_ processor to the oiv tool. 

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