Colin Patrick McCabe created HDFS-5381:
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Summary: ExtendedBlock#hashCode should use both blockId and block
pool ID
Key: HDFS-5381
URL: https://issues.apache.org/jira/browse/HDFS-5381
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode, namenode
Affects Versions: 2.3.0
Reporter: Colin Patrick McCabe
Assignee: Colin Patrick McCabe
Priority: Minor
{{ExtendedBlock#hashCode}} contains both a block pool ID and a block ID. The
{{equals}} function checks both. However, {{hashCode}} only uses block ID.
Since HDFS-4645, block pool IDs are now allocated sequentially. This means
that there will be a lot of hash collisions when federation is in use. We
should use both block ID and block pool ID in {{hashCode}} to prevent this.
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