@xieliang: I will try the PrintGCApplicationStoppedTime, thank you. About loading, total requestPerSeconds is around 15000~30000 for 9 servers, with numberOfOnlineRegions = 136.
I also just uploaded the log files of gc and regionserver into dropbox: https://dl.dropboxusercontent.com/u/60149953/gc-hbase.log.20131023 https://dl.dropboxusercontent.com/u/60149953/hbase-hadoop-regionserver-fchddn2.log My setup is: CentOS release 6.1 (Final) Kernel 2.6.32-131.0.15.el6.x86_64 on an x86_64 Hadoop 1.0.4 HBase 0.94.6 HBASE_REGIONSERVER_OPTS="-XX:+UseParNewGC -Xmn256m -XX:CMSInitiatingOccupancyFraction=70 -Xmx6000m -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=2 -XX:GCLogFileSize=256M -Xloggc:/data1/hadoop/gc-hbase.log" ulimit -a: core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 62853 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 65535 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 32639 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited -----Original Message----- From: 谢良 [mailto:[email protected]] Sent: Wednesday, October 23, 2013 2:54 PM To: [email protected] Subject: 答复: What cause region server to timeout other than long gc? Maybe you can try to add "-XX:+PrintGCApplicationStoppedTime", then if other ops(not gc) caused the long safepoint duration, you could find the log. btw, did you have a high load during that time:) Best, Liang The privileged confidential information contained in this email is intended for use only by the addressees as indicated by the original sender of this email. If you are not the addressee indicated in this email or are not responsible for delivery of the email to such a person, please kindly reply to the sender indicating this fact and delete all copies of it from your computer and network server immediately. Your cooperation is highly appreciated. It is advised that any unauthorized use of confidential information of Winbond is strictly prohibited; and any information in this email irrelevant to the official business of Winbond shall be deemed as neither given nor endorsed by Winbond.
