David Tucker created HDFS-11169:
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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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