Datanode should report deletion of blocks to Namenode explicitly
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Key: HADOOP-5724
URL: https://issues.apache.org/jira/browse/HADOOP-5724
Project: Hadoop Core
Issue Type: Bug
Reporter: Suresh Srinivas
Assignee: Suresh Srinivas
Fix For: 0.21.0
Currently datanode notifies namenode newly added blocks and the blocks that are
corrupt. There is no explicit message from the datanode to the namenode to
indicate the deletion of blocks. Block reports from the datanode is the only
way for the namenode to learn about the deletion of blocks at a datanode. With
the addition of explicit request to indicate to block deletion, block report
interval (which is currently 1 hour) can be increased to a longer duration.
This reduces load on both namenode and datanodes.
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