Guo Ruijing created HDFS-6454:
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Summary: Configurable Block Placement Policy
Key: HDFS-6454
URL: https://issues.apache.org/jira/browse/HDFS-6454
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Reporter: Guo Ruijing
In existing implementation, block choose priority is localhost/remote
rack/local rack/ramdon.
in BlockPlacementPolicyDefault, network topology is /rack/host.
In BlockPlacementPolicyWithNodeGroup, network topology is /rack/nodegroup/host.
This JIRA is to propose block choose priority can be configurable as:
<property>
<name>dfs.block.replicator.priority</name>
<value>0, 2, 1, *</value>
<description>
default network topology is /level2/level1
nodegroup network topology is /level3/level2/level1. choose priority can
be 0(localhost), 3(remote rack), 2(local rack), *(any host)
</description>
</property>
Another example (one VM includes serveral dockers/containers) so network
topology can be /rack/nodegroup/container/host. in this case, block replicator
priority can be
0(localhost), 4(remote rack), 3(local rack), *(any host)
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