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https://issues.apache.org/jira/browse/HBASE-19977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16360490#comment-16360490
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Duo Zhang commented on HBASE-19977:
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An AtomicInteger is enough?
> 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
>
>
> 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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