BlockManager cross-rack replication checks only work for ScriptBasedMapping
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Key: HDFS-2492
URL: https://issues.apache.org/jira/browse/HDFS-2492
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 0.23.0, 0.24.0
Reporter: Steve Loughran
The BlockManager cross-rack replication checks only works if script files are
used for replication, not if alternate plugins provide the topology information.
This is because the BlockManager sets its rack checking flag if there is a
filename key
{code}
shouldCheckForEnoughRacks =
conf.get(DFSConfigKeys.NET_TOPOLOGY_SCRIPT_FILE_NAME_KEY) != null;
{code}
yet this filename key is only used if the topology mapper defined by
{code}
DFSConfigKeys.NET_TOPOLOGY_NODE_SWITCH_MAPPING_IMPL_KEY
{code}
is an instance of {{ScriptBasedMapping}}
If any other mapper is used, the system may be multi rack, but the Block
Manager will not be aware of this fact unless the filename key is set to
something non-null
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