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Date: Wed, 30 Mar 2016 05:58:25 +0000 (UTC)
From: "Walter Su (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-9918) Erasure Coding: Sort located striped
 blocks based on decommissioned states
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    [ https://issues.apache.org/jira/browse/HDFS-9918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15217456#comment-15217456 ] 

Walter Su commented on HDFS-9918:
---------------------------------

I see the difference. To achieve your goal, we need a new comparator, and zip 3 arrays into 1 array. But I don't see the point of preserving the order of blkIndices.
bq. how about going ahead with the previous approach?
It's just I prefer comparator paradigm. It's easier to understand and modify. I'm ok with your previous approach.:)

> Erasure Coding: Sort located striped blocks based on decommissioned states
> --------------------------------------------------------------------------
>
>                 Key: HDFS-9918
>                 URL: https://issues.apache.org/jira/browse/HDFS-9918
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Rakesh R
>            Assignee: Rakesh R
>         Attachments: HDFS-9918-001.patch, HDFS-9918-002.patch, HDFS-9918-003.patch, HDFS-9918-004.patch, HDFS-9918-005.patch, HDFS-9918-006.patch, HDFS-9918-007.patch
>
>
> This jira is a follow-on work of HDFS-8786, where we do decommissioning of datanodes having striped blocks.
> Now, after decommissioning it requires to change the ordering of the storage list so that the decommissioned datanodes should only be last node in list.
> For example, assume we have a block group with storage list:-
> d0, d1, d2, d3, d4, d5, d6, d7, d8, d9
> mapping to indices
> 0, 1, 2, 3, 4, 5, 6, 7, 8, 2
> Here the internal block b2 is duplicated, locating in d2 and d9. If d2 is a decommissioning node then should switch d2 and d9 in the storage list.
> Thanks [~jingzhao] for the [discussions|https://issues.apache.org/jira/browse/HDFS-8786?focusedCommentId=15180415&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15180415]


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