NameNode should not send empty block replication request to DataNode
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Key: HADOOP-5479
URL: https://issues.apache.org/jira/browse/HADOOP-5479
Project: Hadoop Core
Issue Type: Bug
Components: dfs
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Priority: Blocker
Fix For: 0.19.2, 0.20.0, 0.21.0
On our production clusters, we occasionally see that NameNode sends an empty
block replication request to DataNode on every heartbeat, thus blocking this
DataNode from replicating or deleting any block.
This is partly caused by DataNode sending a wrong number of replications in
progress which will be fixed by HADOOP-5465. There is also a flaw at the
NameNode side. NameNode should not interpret the number of replications in
progress as the number of targets since replication is done through a pipeline.
It also should make sure that no empty replication request is sent to DataNode.
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