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Chris Douglas commented on HDFS-12681: -------------------------------------- bq. I am trying to understand why this is returning null, could you explain why this change caused this blockLocations to be returned null, as I was not clear with that part? Are you observing this returning null? Or are you asking if it might? After this change, if an application requests a mix of {{FileStatus}} and {{LocatedFileStatus}} instances, then it can't distinguish whether it needs an RPC to fetch locations based on their type (as in the example you cite). v05 (IIRC) of the patch is an alternative [discussed|https://issues.apache.org/jira/browse/HDFS-12681?focusedCommentId=16219657&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16219657] earlier. 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. > 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}}. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org