stack created HBASE-21155:
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Summary: Save on a few log strings and some churn in wal splitter
by skipping out early if no logs in dir
Key: HBASE-21155
URL: https://issues.apache.org/jira/browse/HBASE-21155
Project: HBase
Issue Type: Improvement
Reporter: stack
Assignee: stack
Trivial change to splitlogmanager that saves us a log line at least per WAL dir
when it goes to split. Also saves some not-needed churn in SLM.
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