nkeywal created HDFS-3702:
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Summary: Add an option for NOT writing the blocks locally if there
is a datanode on the same box as the client
Key: HDFS-3702
URL: https://issues.apache.org/jira/browse/HDFS-3702
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs client
Affects Versions: 2.0.0-alpha, 1.0.3
Reporter: nkeywal
Priority: Minor
This is useful for Write-Ahead-Logs: these files are writen for recovery only,
and are not read when there are no failures.
Taking HBase as an example, these files will be read only if the process that
wrote them (the 'HBase regionserver') dies. This will likely come from a
hardware failure, hence the corresponding datanode will be dead as well. So
we're writing 3 replicas, but in reality only 2 of them are really useful.
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