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From "Ayush Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14266) EC : Unable To Get Datanode Info for EC Blocks if One Block Is Not Available.
Date Mon, 11 Feb 2019 13:14:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16764941#comment-16764941
] 

Ayush Saxena commented on HDFS-14266:
-------------------------------------

Thanx [~Harsha1206] for reporting. The reason for failure the BlockInfo is extended by BlockInfoContiguous
and BlockInfoStriped and both have different way for removeStorage() method. Each while removing
sets the storage to null but in contiguous it sets that null to end of array but in stripped
since the block position matter we don't set that to end. It is there intact in its position.

So here in :

{code:java}
    for(int idx = (blockInfo.numNodes()-1); idx >= 0; idx--) {
        DatanodeDescriptor dn = blockInfo.getDatanode(idx);
{code}

This doesn't work since in striped the null storage aren't at end. but in middle. So it returns
null.

Uploaded patch with fix.

Pls Review!!!


> EC : Unable To Get Datanode Info for EC Blocks if One Block Is Not Available.
> -----------------------------------------------------------------------------
>
>                 Key: HDFS-14266
>                 URL: https://issues.apache.org/jira/browse/HDFS-14266
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 3.1.1
>            Reporter: Harshakiran Reddy
>            Assignee: Ayush Saxena
>            Priority: Major
>              Labels: EC
>         Attachments: HDFS-14266-01.patch
>
>
> If one block gets removed from the block group then the datanode information for the
block group comes shows null.
>  
> {noformat}
> Block Id: blk_-9223372036854775792
> Block belongs to: /ec/file1
> No. of Expected Replica: 2
> No. of live Replica: 2
> No. of excess Replica: 0
> No. of stale Replica: 0
> No. of decommissioned Replica: 0
> No. of decommissioning Replica: 0
> No. of corrupted Replica: 0
> null
> Fsck on blockId 'blk_-9223372036854775792
> {noformat}



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