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From syuanji...@apache.org
Subject [16/22] hbase git commit: HBASE-15255 Add pointer to linkedin blog on putting jvm logs on fast disk
Date Sat, 13 Feb 2016 20:10:27 GMT
HBASE-15255 Add pointer to linkedin blog on putting jvm logs on fast disk


Project: http://git-wip-us.apache.org/repos/asf/hbase/repo
Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/ab50c7c8
Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/ab50c7c8
Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/ab50c7c8

Branch: refs/heads/hbase-12439
Commit: ab50c7c8c64aa00da14167b01a9e599098afe4bc
Parents: 25dfc11
Author: stack <stack@apache.org>
Authored: Thu Feb 11 13:18:28 2016 -0800
Committer: stack <stack@apache.org>
Committed: Thu Feb 11 13:18:28 2016 -0800

----------------------------------------------------------------------
 src/main/asciidoc/_chapters/performance.adoc | 8 ++++++++
 1 file changed, 8 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hbase/blob/ab50c7c8/src/main/asciidoc/_chapters/performance.adoc
----------------------------------------------------------------------
diff --git a/src/main/asciidoc/_chapters/performance.adoc b/src/main/asciidoc/_chapters/performance.adoc
index 5155f0a..ee7933c 100644
--- a/src/main/asciidoc/_chapters/performance.adoc
+++ b/src/main/asciidoc/_chapters/performance.adoc
@@ -48,6 +48,11 @@ Use a 64-bit platform (and 64-bit JVM).
 Watch out for swapping.
 Set `swappiness` to 0.
 
+[[perf.os.cpu]]
+=== CPU
+Make sure you have set up your Hadoop to use native, hardware checksumming.
+See link:[hadoop.native.lib].
+
 [[perf.network]]
 == Network
 
@@ -137,6 +142,9 @@ It describes configurations to lower the amount of young GC during write-heavy
l
 If you do not have HBASE-8163 installed, and you are trying to improve your young GC times,
one trick to consider -- courtesy of our Liang Xie -- is to set the GC config `-XX:PretenureSizeThreshold`
in _hbase-env.sh_ to be just smaller than the size of `hbase.hregion.memstore.mslab.chunksize`
so MSLAB allocations happen in the tenured space directly rather than first in the young gen.
 You'd do this because these MSLAB allocations are going to likely make it to the old gen
anyways and rather than pay the price of a copies between s0 and s1 in eden space followed
by the copy up from young to old gen after the MSLABs have achieved sufficient tenure, save
a bit of YGC churn and allocate in the old gen directly.
 
+Other sources of long GCs can be the JVM itself logging.
+See link:https://engineering.linkedin.com/blog/2016/02/eliminating-large-jvm-gc-pauses-caused-by-background-io-traffic[Eliminating
Large JVM GC Pauses Caused by Background IO Traffic]
+
 For more information about GC logs, see <<trouble.log.gc>>.
 
 Consider also enabling the off-heap Block Cache.


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