Sergey Shelukhin created HBASE-22290:
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             Summary: add an option to replay WALs without splitting
                 Key: HBASE-22290
                 URL: https://issues.apache.org/jira/browse/HBASE-22290
             Project: HBase
          Issue Type: Bug
            Reporter: Sergey Shelukhin


As is, on some FS it may be faster to have every RS concerned read the WALs 
instead of splitting WALs first and then re-reading. Additionally, given that 
WAL can often be held up by a slow-flushing/low-volume region, storing an 
additional structure next to the WAL that is the same map that RS uses to 
archive WALs (a mapping that allows one to determine which region needs which 
WALs based on its last flush) can accelerate it even further for the common 
case.



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