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From "Uma Maheswara Rao G (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2687) Tests are failing with ClassCastException, due to new protocol changes
Date Thu, 15 Dec 2011 16:14:30 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170318#comment-13170318

Uma Maheswara Rao G commented on HDFS-2687:

I just debugged the failure
*Following is the initial analysis:*
Previous behaviour of getListing in ClientNamenodeProtocolTranslatorR23 is 
  It will pass needLocation flag as true and server side will be packed empty LocatedBlocks
with HdfsLocatedFileStatus object if getBlocations are null and needLocation flag is true.
So, cleint will reconstruct the HdfsLocatedFileStatus directly  if HdfsfileStatus is instanceOf

But with new implementation of protocolBuffers,  It is just ignoring the LocatedBlocks are
server side if the getBlocklocations are null. At client side, to reconstruct the HDFSFileStatus
object, it is depending on locations field. Since there is no locations field here, it is
considering HDFSFileStatus as just HDFSFileStatus.

Here test assumes that HDFSFileStatus  obj will be type of HdfsLocatedFileStatus  and trying
cast. This is failing here.

> Tests are failing with ClassCastException, due to new protocol changes 
> -----------------------------------------------------------------------
>                 Key: HDFS-2687
>                 URL: https://issues.apache.org/jira/browse/HDFS-2687
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Uma Maheswara Rao G
> https://builds.apache.org/job/Hadoop-Hdfs-trunk/lastCompletedBuild/testReport/
> java.lang.ClassCastException: org.apache.hadoop.hdfs.protocol.HdfsFileStatus cannot be
cast to org.apache.hadoop.hdfs.protocol.HdfsLocatedFileStatus
> 	at org.apache.hadoop.hdfs.DistributedFileSystem$1.hasNext(DistributedFileSystem.java:452)
> 	at org.apache.hadoop.fs.FileSystem$5.hasNext(FileSystem.java:1551)
> 	at org.apache.hadoop.fs.FileSystem$5.next(FileSystem.java:1581)
> 	at org.apache.hadoop.fs.FileSystem$5.next(FileSystem.java:1541)
> 	at org.apache.hadoop.fs.TestListFiles.testDirectory(TestListFiles.java:146)

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