Hudson commented on HBASE-19977:

FAILURE: Integrated in Jenkins build HBase-Trunk_matrix #4578 (See 
HBASE-19977 FileMmapEngine allocation of byte buffers should be 
(ramkrishna.s.vasudevan: rev 16f1f5b49424fcabc9b5c10882dab4f5bf7fa84b)
* (edit) 

> 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
>            Priority: Major
>             Fix For: 2.0.0-beta-2
>         Attachments: HBASE-19977.patch
> 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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