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From "Rakesh R (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9918) Erasure Coding : sort located striped blocks based on decommissioned states
Date Tue, 08 Mar 2016 09:22:40 GMT
Rakesh R created HDFS-9918:
------------------------------

             Summary: 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


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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