ramkrishna.s.vasudevan created HBASE-19977:
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             Summary: FileMmapEngine allocation of byte buffers should be 
synchronized
                 Key: HBASE-19977
                 URL: https://issues.apache.org/jira/browse/HBASE-19977
             Project: HBase
          Issue Type: Bug
    Affects Versions: 2.0.0-alpha-4
            Reporter: ramkrishna.s.vasudevan
            Assignee: ramkrishna.s.vasudevan
             Fix For: 2.0.0-beta-2


Recently we have been testing bucket cache with mmap mode. We found that after 
the multi threading way of allocating the byte buffers for offheap bucket 
cache, the creation of the mmapped byte buffers needs to be synchronized for 
allocating the right sized mmapped buffers.



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