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https://issues.apache.org/jira/browse/HDFS-12681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16253920#comment-16253920
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Bharat Viswanadham commented on HDFS-12681:
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[~chris.douglas]
Thank You for info.
Yes, we have observed it being returning null.
{noformat}
In the cases we found (though this wasn't exhaustive), clients that used
locations requested the locations in the first request (receiving
LocatedFileStatus), not using 2 RPCs.
{noformat}
So, I need to call this makeQualifiedLocated
((LocatedFileStatus) file).makeQualifiedLocated(URI defaultUri,path) and then
call
((LocatedFileStatus) file).getBlockLocations();
And now need to remove the code of using
{noformat}
(file instanceof LocatedFileStatus)
{noformat}
as now it can't distiniguish whether it needs an RPC call, so we need to
directly call fs.getFileBlockLocations?
{code:java}
As from code comments, it is mentioned
/**
* This function is used to transform the underlying HDFS LocatedBlocks to
* BlockLocations. This method must be invoked before
* {@link #getBlockLocations()}.
**/
{code}
> Fold HdfsLocatedFileStatus into HdfsFileStatus
> ----------------------------------------------
>
> Key: HDFS-12681
> URL: https://issues.apache.org/jira/browse/HDFS-12681
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Chris Douglas
> Assignee: Chris Douglas
> Priority: Minor
> Fix For: 3.1.0
>
> Attachments: HDFS-12681.00.patch, HDFS-12681.01.patch,
> HDFS-12681.02.patch, HDFS-12681.03.patch, HDFS-12681.04.patch,
> HDFS-12681.05.patch, HDFS-12681.06.patch, HDFS-12681.07.patch,
> HDFS-12681.08.patch, HDFS-12681.09.patch, HDFS-12681.10.patch
>
>
> {{HdfsLocatedFileStatus}} is a subtype of {{HdfsFileStatus}}, but not of
> {{LocatedFileStatus}}. Conversion requires copying common fields and shedding
> unknown data. It would be cleaner and sufficient for {{HdfsFileStatus}} to
> extend {{LocatedFileStatus}}.
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