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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8580) Erasure coding: Persist cellSize in BlockInfoStriped and StripedBlocksFeature
Date Wed, 17 Jun 2015 18:37:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8580?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jing Zhao updated HDFS-8580:
----------------------------
       Resolution: Fixed
    Fix Version/s: HDFS-7285
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

The 04 patch looks good to me. +1. 

I've committed this to the feature branch. Thanks for the contribution, [~walter.k.su]!

> Erasure coding: Persist cellSize in BlockInfoStriped and StripedBlocksFeature
> -----------------------------------------------------------------------------
>
>                 Key: HDFS-8580
>                 URL: https://issues.apache.org/jira/browse/HDFS-8580
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Walter Su
>            Assignee: Walter Su
>             Fix For: HDFS-7285
>
>         Attachments: HDFS-8580-HDFS-7285.01.patch, HDFS-8580-HDFS-7285.02.patch, HDFS-8580-HDFS-7285.03.patch,
HDFS-8580-HDFS-7285.04.patch, HDFS-8580.00.patch
>
>
> Zhe Zhang, Kai Zheng and I had a offline discussion. Here is what we thought:  Add a
cellSize field in BlockInfoStriped as a workaround, and deal with memory usage in follow-on.(HDFS-8059)
> discussion in HDFS-8494:
> from Walter Su:
> {quote}
> I think BlockInfoStriped needs to keep cellSize.
> {quote}
> from [~vinayrpet]:
> {quote}
> I too was thinking the same when the FSImageLoader problem has came up. This will increase
the memory usage by ~4bytes for each block though.
> {quote}
> from [~jingzhao]
> {quote}
> -Also, we should consider adding a chunk size field to StripedBlockProto and removing
the cell size field from HdfsFileStatus. In this way we can access the chunk size information
in the storage layer.-
> {quote}
> ==
> update:
> from [~jingzhao]
> {quote}
> For fsimage part, since HDFS-8585 just removes StripedBlockProto, I guess what we can
do here is to either 1) add the cellSize information into StripedBlocksFeature in fsimage.proto,
or 2) bring StripedBlockProto back and put block info and cell size there.
> {quote}



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