Piggyback allocation of first block with create() call
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Key: HDFS-3029
URL: https://issues.apache.org/jira/browse/HDFS-3029
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs client, name-node, performance
Reporter: Todd Lipcon
Currently to create a file, the client makes two requests: the first to create
the file, the second to allocate the block. In an HA setup, both of these
necessitate a sync of the edit logs. In all setups, it requires an unnecessary
round trip. We should consider piggy-backing the allocation of the first block
with the create() call since it will be needed almost all the time.
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