[jira] [Created] (HBASE-10324) refactor deferred-log-flush/Durability related interface/code/naming to align with changed semantic by the new write thread model

["Feng Honghua (JIRA)" <ji...@apache.org>]

Feng Honghua created HBASE-10324:
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             Summary: refactor deferred-log-flush/Durability related interface/code/naming to align with changed semantic by the new write thread model
                 Key: HBASE-10324
                 URL: https://issues.apache.org/jira/browse/HBASE-10324
             Project: HBase
          Issue Type: Improvement
          Components: Client, regionserver
            Reporter: Feng Honghua
            Assignee: Feng Honghua


By the new write thread model introduced by [HBASE-8755|https://issues.apache.org/jira/browse/HBASE-8755], some deferred-log-flush/Durability API/code/names should be change accordingly:
1. no timer-triggered deferred-log-flush since flush is always done by async threads, so configuration 'hbase.regionserver.optionallogflushinterval' is no longer needed
2. the async writer-syncer-notifier threads will always be triggered implicitly, this semantic is that it always holds that 'hbase.regionserver.optionallogflushinterval' > 0, so deferredLogSyncDisabled in HRegion.java which affects durability behavior should always be true
3. what HTableDescriptor.isDeferredLogFlush really means is the write  can return without waiting for the sync is done, so the interface name should be changed to isAsyncLogFlush/setAsyncLogFlush to reflect their real meaning



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