Do not start LogSyncer when not in deferred flush mode
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Key: HBASE-3530
URL: https://issues.apache.org/jira/browse/HBASE-3530
Project: HBase
Issue Type: Improvement
Components: regionserver
Affects Versions: 0.90.0
Reporter: Lars George
Priority: Minor
Fix For: 0.92.0
Currently we always start the LogSyncer thread, even when not necessary because
the "deferred flush" is set to false and the sync() is called on every record.
We could disable the thread and not have it flush every n secs unnecessarily.
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