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From "Ramkumar Vadali" <ramkumar.vad...@gmail.com>
Subject Re: Review Request: BlockPlacement policy for RAID
Date Thu, 09 Dec 2010 19:35:26 GMT

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/159/#review62
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Ship it!


Looks good.

- Ramkumar


On 2010-12-09 11:09:23, Scott Chen wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/159/
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> 
> (Updated 2010-12-09 11:09:23)
> 
> 
> Review request for hadoop-mapreduce, Dhruba Borthakur and Ramkumar Vadali.
> 
> 
> Summary
> -------
> 
> Raid introduce the new dependency between blocks within a file.
> The blocks help decode each other. Therefore we should avoid put them on the same machine.
> The proposed BlockPlacementPolicy does the following
> 1. When writing parity blocks, it avoid the parity blocks and source blocks sit together.
> 2. When reducing replication number, it deletes the blocks that sits with other dependent
blocks.
> 3. It does not change the way we write normal files. It only has different behavior when
processing raid files.
> 
> 
> Diffs
> -----
> 
>   trunk/src/contrib/raid/src/java/org/apache/hadoop/hdfs/server/namenode/BlockPlacementPolicyRaid.java
PRE-CREATION 
>   trunk/src/contrib/raid/src/java/org/apache/hadoop/raid/RaidNode.java 1040840 
>   trunk/src/contrib/raid/src/test/org/apache/hadoop/hdfs/server/namenode/TestBlockPlacementPolicyRaid.java
PRE-CREATION 
> 
> Diff: https://reviews.apache.org/r/159/diff
> 
> 
> Testing
> -------
> 
> 
> Thanks,
> 
> Scott
> 
>


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