[
https://issues.apache.org/jira/browse/HBASE-17073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15666045#comment-15666045
]
Anoop Sam John commented on HBASE-17073:
----------------------------------------
Thanks Stack. Will commit in some time
bq.What we doing to do with direct memory config in 2.0? Have a default that is
same as HBASE_HEAPSIZE or some other such?
# Uncomment below if you intend to use off heap cache. For example, to allocate
8G of
# offheap, set the value to "8G".
# export HBASE_OFFHEAPSIZE=1G
This is what we have in hbase-env.sh now. We need more notes around this and
some suggestion? May be more details in book also. This depends on whether we
want L2 off heap BC as the default data cache in 2.0. (I would like to and
will open a jira soon) Also if users use off heap MSLAB pool, then that also
to be added up.. May be I will raise a sub task under the jira of "memory
sizing and tuning" (forgot id. Will check).. Once the off heap write path work
is also over, will work on that.. Thanks for the good Q Stack. I forgot doing
this. Sounds ok?
> Increase the max number of buffers in ByteBufferPool
> ----------------------------------------------------
>
> Key: HBASE-17073
> URL: https://issues.apache.org/jira/browse/HBASE-17073
> Project: HBase
> Issue Type: Sub-task
> Affects Versions: 2.0.0
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Fix For: 2.0.0
>
> Attachments: HBASE-17073.patch
>
>
> Before the HBASE-15525 issue fix, we had variable sized buffers in our buffer
> pool. The max size upto which one buffer can grow was 2 MB. Now we have
> changed it to be a fixed sized BBPool. By default 64 KB is the size of each
> buffer. But the max number of BBs allowed to be in the pool was not changed.
> ie. twice the number of handlers. May be we should be changing increasing it
> now? To make it equal to the way like 2 MB, we will need 32 * 2 * handlers.
> There is no initial #BBs any way. 2 MB is the default max response size what
> we have. And write reqs also, when it is Buffered mutator 2 MB is the default
> flush limit. We can make it to be 32 * #handlers as the def max #BBs I
> believe.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
