Fix atomic put/delete with region server failures.
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Key: HBASE-5203
URL: https://issues.apache.org/jira/browse/HBASE-5203
Project: HBase
Issue Type: Sub-task
Reporter: Lars Hofhansl
HBASE-3584 does not not provide fully atomic operation in case of region server
failures (see explanation there).
What should happen is that either (1) all edits are applied via a single
WALEdit, or (2) the WALEdits are applied in async mode and then sync'ed
together.
For #1 it is not clear whether it is advisable to manage multiple *different*
operations (Put/Delete) via a single WAL edit. A quick check reveals that WAL
replay on region startup would work, but that replication would need to be
adapted. The refactoring needed would be non-trivial.
#2 Might actually not work, as another operation could request sync'ing a later
edit and hence flush these entries out as well.
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