Brahma Reddy Battula commented on HDFS-10810:

Scenario is like  

a) Enable batchIBR and write one block and close file
b) Call setrep on this file
c) As block is only committed,{{isNeededReconstruction}} will be false and 
block will not updated in {{neededReconstruction}} hence this will not marked 
as underreplicated.

>  Setreplication removing block from underconstrcution temporarily when batch 
> IBR is enabled.
> --------------------------------------------------------------------------------------------
>                 Key: HDFS-10810
>                 URL: https://issues.apache.org/jira/browse/HDFS-10810
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Brahma Reddy Battula
>            Assignee: Brahma Reddy Battula
>         Attachments: HDFS-10810-002.patch, HDFS-10810.patch
> 1)Batch IBR is enabled with number of committed blocks allowed=1
> 2) Written one block and closed the file without waiting for IBR
> 3)Setreplication called immediately on the file. 
> So till the finalized IBR Received, block will not be added to 
> neededReconstruction
> {code}
> if (isNeededReconstruction(block, repl.liveReplicas())) {
>         neededReconstruction.update(block, repl.liveReplicas(),
>             repl.readOnlyReplicas(), repl.decommissionedAndDecommissioning(),
>             curExpectedReplicas, curReplicasDelta, expectedReplicasDelta);
>       }.{code}

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