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https://issues.apache.org/jira/browse/HBASE-13819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15209398#comment-15209398
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stack commented on HBASE-13819:
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The BBBP is configurable. You can set upper bound on BBBP member size.
bq. Still IMO these on demand BB creation should not be on off heap area.
Interesting. Why you say? Because it slower doing it offheap? What is wrong
doing it offheap otherwise? Why is the offheap BB not discarded?
So, I think this the issue... the server is overrun and so burst our bounds on
the BBBP and when at limit, new BB's are allocated offheap... so we go outside
of our expected offheap usage. Is there leaking going on here?
But we have means of bounding the queues of inbound traffic.
In description above though, talk is of Responder queue backed up which seems
to say we are not clearing the server of finished responses fast enough....
> Make RPC layer CellBlock buffer a DirectByteBuffer
> --------------------------------------------------
>
> Key: HBASE-13819
> URL: https://issues.apache.org/jira/browse/HBASE-13819
> Project: HBase
> Issue Type: Sub-task
> Components: Scanners
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Fix For: 2.0.0, 1.3.0
>
> Attachments: HBASE-13819.patch, HBASE-13819_branch-1.patch,
> HBASE-13819_branch-1.patch, HBASE-13819_branch-1.patch
>
>
> In RPC layer, when we make a cellBlock to put as RPC payload, we will make an
> on heap byte buffer (via BoundedByteBufferPool). The pool will keep upto
> certain number of buffers. This jira aims at testing possibility for making
> this buffers off heap ones. (DBB) The advantages
> 1. Unsafe based writes to off heap is faster than that to on heap. Now we are
> not using unsafe based writes at all. Even if we add, DBB will be better
> 2. When Cells are backed by off heap (HBASE-11425) off heap to off heap
> writes will be better
> 3. When checked the code in SocketChannel impl, if we pass a HeapByteBuffer
> to the socket channel, it will create a temp DBB and copy data to there and
> only DBBs will be moved to Sockets. If we make DBB 1st hand itself, we can
> avoid this one more level of copying.
> Will do different perf testing with changed and report back.
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