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Posted to commits@lucene.apache.org by el...@apache.org on 2015/03/28 05:09:16 UTC
svn commit: r1669732 - in /lucene/dev/branches/branch_5x: ./ solr/
solr/CHANGES.txt solr/bin/ solr/bin/solr.in.cmd solr/bin/solr.in.sh
Author: elyograg
Date: Sat Mar 28 04:09:16 2015
New Revision: 1669732
URL: http://svn.apache.org/r1669732
Log:
SOLR-7319: Workaround for the "Four Month Bug" GC pause problem (merge trunk r1669731)
Modified:
lucene/dev/branches/branch_5x/ (props changed)
lucene/dev/branches/branch_5x/solr/ (props changed)
lucene/dev/branches/branch_5x/solr/CHANGES.txt (contents, props changed)
lucene/dev/branches/branch_5x/solr/bin/ (props changed)
lucene/dev/branches/branch_5x/solr/bin/solr.in.cmd
lucene/dev/branches/branch_5x/solr/bin/solr.in.sh
Modified: lucene/dev/branches/branch_5x/solr/CHANGES.txt
URL: http://svn.apache.org/viewvc/lucene/dev/branches/branch_5x/solr/CHANGES.txt?rev=1669732&r1=1669731&r2=1669732&view=diff
==============================================================================
--- lucene/dev/branches/branch_5x/solr/CHANGES.txt (original)
+++ lucene/dev/branches/branch_5x/solr/CHANGES.txt Sat Mar 28 04:09:16 2015
@@ -42,6 +42,15 @@ Upgrading from Solr 5.0
contain some LGPL-only code. Until that's resolved by Tika, you can download the
.jar yourself and place it under contrib/extraction/lib.
+* A twitter engineer discovered a JVM bug that causes GC pause problems. The
+ workaround for those problems makes certain functionality impossible, such as
+ running the jstat program on your Solr instance. That workaround has been
+ implemented in the bin/solr start scripts. If you need the missing java
+ functionality, delete the "-XX:+PerfDisableSharedMem" parameter from
+ bin/solr.in.sh or bin/solr.in.cmd.
+
+ http://www.evanjones.ca/jvm-mmap-pause.html
+
Detailed Change List
----------------------
@@ -286,6 +295,12 @@ Bug Fixes
* SOLR-7309: Make bin/solr, bin/post work when Solr installation directory contains spaces
(Ramkumar Aiyengar, Martijn Koster)
+* SOLR-7319: Workaround for the "Four Month Bug" GC pause problem discovered
+ by a twitter software engineer. This causes GC pauses when JVM statistics
+ are left enabled and there is heavy MMAP write activity.
+ http://www.evanjones.ca/jvm-mmap-pause.html
+ (Shawn Heisey)
+
Optimizations
----------------------
Modified: lucene/dev/branches/branch_5x/solr/bin/solr.in.cmd
URL: http://svn.apache.org/viewvc/lucene/dev/branches/branch_5x/solr/bin/solr.in.cmd?rev=1669732&r1=1669731&r2=1669732&view=diff
==============================================================================
--- lucene/dev/branches/branch_5x/solr/bin/solr.in.cmd (original)
+++ lucene/dev/branches/branch_5x/solr/bin/solr.in.cmd Sat Mar 28 04:09:16 2015
@@ -40,6 +40,7 @@ set GC_TUNE=-XX:NewRatio=3 ^
-XX:+UseCMSInitiatingOccupancyOnly ^
-XX:CMSInitiatingOccupancyFraction=50 ^
-XX:CMSMaxAbortablePrecleanTime=6000 ^
+ -XX:+PerfDisableSharedMem ^
-XX:+CMSParallelRemarkEnabled ^
-XX:+ParallelRefProcEnabled
Modified: lucene/dev/branches/branch_5x/solr/bin/solr.in.sh
URL: http://svn.apache.org/viewvc/lucene/dev/branches/branch_5x/solr/bin/solr.in.sh?rev=1669732&r1=1669731&r2=1669732&view=diff
==============================================================================
--- lucene/dev/branches/branch_5x/solr/bin/solr.in.sh (original)
+++ lucene/dev/branches/branch_5x/solr/bin/solr.in.sh Sat Mar 28 04:09:16 2015
@@ -37,6 +37,7 @@ GC_TUNE="-XX:NewRatio=3 \
-XX:PretenureSizeThreshold=64m \
-XX:+UseCMSInitiatingOccupancyOnly \
-XX:CMSInitiatingOccupancyFraction=50 \
+-XX:+PerfDisableSharedMem \
-XX:CMSMaxAbortablePrecleanTime=6000 \
-XX:+CMSParallelRemarkEnabled \
-XX:+ParallelRefProcEnabled"