Read the logs in batches during log splitting to avoid OOME
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                 Key: HBASE-1430
                 URL: https://issues.apache.org/jira/browse/HBASE-1430
             Project: Hadoop HBase
          Issue Type: Improvement
            Reporter: Jean-Daniel Cryans
            Assignee: Jean-Daniel Cryans
            Priority: Blocker
             Fix For: 0.20.0, 0.19.3


During log splitting, in the worst case we can read 64 logs of 64MB which will 
surely bust any heap. Instead we should read the logs in batches of 5-10 that 
we write right away.

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