Pre-allocate HDFS edit log files after writing version number
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Key: HDFS-2759
URL: https://issues.apache.org/jira/browse/HDFS-2759
Project: Hadoop HDFS
Issue Type: Sub-task
Components: name-node
Affects Versions: HA branch (HDFS-1623)
Reporter: Aaron T. Myers
Assignee: Aaron T. Myers
In HDFS-2709 it was discovered that there's a potential race wherein edits log
files are pre-allocated before the version number is written into the header of
the file. This can cause the standby to read an invalid version. We should
write the header, then pre-allocate the rest of the file after this point.
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