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From "David Tucker (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11169) GetBlockLocations returns a block when offset > filesize and file only has 1 block
Date Wed, 23 Nov 2016 01:37:58 GMT
David Tucker created HDFS-11169:
-----------------------------------

             Summary: GetBlockLocations returns a block when offset > filesize and file
only has 1 block
                 Key: HDFS-11169
                 URL: https://issues.apache.org/jira/browse/HDFS-11169
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.7.1
         Environment: HDP 2.5, Ambari 2.4
            Reporter: David Tucker
            Priority: Minor


Start with a fresh deployment of HDFS.
1. Create a file.
2. AddBlock the file.
3. Call GetBlockLocations.

Expectation: 0 blocks are returned because the only added block is incomplete.

Observation: 1 block is returned.

This only seems to occur when 1 block is in play (i.e. if you write a block and call AddBlock
again, GetBlockLocations seems to behave as expected).

This seems to be related to HDFS-513.
I suspect the following line needs revision: https://github.com/apache/hadoop/blob/4484b48498b2ab2a40a404c487c7a4e875df10dc/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java#L1062
I believe it should be >= instead of >:
    if (nrBlocks >= 0 && curBlk == nrBlocks)   // offset >= end of file



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