Jing Zhao created HDFS-6961:
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Summary: BlockPlacementPolicy#chooseTarget should check each valid
storage type in each choosing round
Key: HDFS-6961
URL: https://issues.apache.org/jira/browse/HDFS-6961
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Jing Zhao
Assignee: Jing Zhao
Currently in each choosing round of BlockPlacementPolicy#chooseTarget (e.g.,
round 1 for choosing local storage, round 2 for remote rack, etc.), we only
take into account the first storage type in the storage type list. This may
fail to choose the local machine or sometimes may even fail to choose enough
nodes.
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