Decommissioning nodes does not increase replication priority
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Key: HDFS-1300
URL: https://issues.apache.org/jira/browse/HDFS-1300
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 0.20.2, 0.20.1, 0.20-append, 0.20.3, 0.21.0, 0.22.0
Reporter: Dmytro Molkov
Assignee: Dmytro Molkov
Fix For: 0.22.0
Currently when you decommission a node each block is only inserted into
neededReplications if it is not there yet. This causes a problem of a block
sitting in a low priority queue when all replicas sit on the nodes being
decommissioned.
The common usecase for decommissioning nodes for us is proactively exclude them
before they went bad, so it would be great to get the blocks at risk onto the
live datanodes as quickly as possible.
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