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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4380) Opening a file for read before writer writes a block causes NPE
Date Tue, 15 Jan 2013 19:42:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13554212#comment-13554212
] 

Hudson commented on HDFS-4380:
------------------------------

Integrated in HBase-0.94-security #95 (See [https://builds.apache.org/job/HBase-0.94-security/95/])
    HBASE-7530  [replication] Work around HDFS-4380 else we get NPEs
HBASE-7531  [replication] NPE in SequenceFileLogReader because
            ReplicationSource doesn't nullify the reader
HBASE-7534  [replication] TestReplication.queueFailover can fail
            because HBaseTestingUtility.createMultiRegions is dangerous (Revision 1431769)

     Result = SUCCESS
jdcryans : 
Files : 
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSource.java
* /hbase/branches/0.94/src/test/java/org/apache/hadoop/hbase/HBaseTestingUtility.java
* /hbase/branches/0.94/src/test/java/org/apache/hadoop/hbase/replication/TestReplication.java

                
> Opening a file for read before writer writes a block causes NPE
> ---------------------------------------------------------------
>
>                 Key: HDFS-4380
>                 URL: https://issues.apache.org/jira/browse/HDFS-4380
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 1.0.3
>            Reporter: Todd Lipcon
>
> JD Cryans found this issue: it seems like, if you open a file for read immediately after
it's been created by the writer, after a block has been allocated, but before the block is
created on the DNs, then you can end up with the following NPE:
> java.lang.NullPointerException
>        at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.updateBlockInfo(DFSClient.java:1885)
>        at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.openInfo(DFSClient.java:1858)
>        at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.<init>(DFSClient.java:1834)
>        at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:578)
>        at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:154)
> This seems to be because {{getBlockInfo}} returns a null block when the DN doesn't yet
have the replica. The client should probably either fall back to a different replica or treat
it as zero-length.

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