Hi,
This is the expected behavior for jmap and jinfo. If you call jstack
with the "-F" flag you will see the same behavior.
The reason for this is that jmap, jinfo and jstack -F all attach to your
target JVM as a debugger and read the memory from the process. That
needs to be done when the target process is in a frozen state.
/Mikael
On 2014-09-02 11:08, tobe wrote:
When I run jinfo or jmap to any Java process, it will "suspend" the Java
process. It's 100% reproduced for the long running processes.
Here're the detailed steps:
1. Pick a Java process which is running over 25 days(It's wired because
this doesn't work for new processes).
2. Run ps to check the state of the process, should be "Sl" which is
expected.
3. Run jinfo or jmap to this process(BTY, jstack doesn't have this issue).
4. Run ps to check the state of the process. This time it changes to "Tl"
which means STOPPED and the process doesn't response any requests.
Here's the output of our process:
[work@hadoop ~]$ ps aux |grep "qktst" |grep "RegionServer"
work 36663 0.1 1.7 24157828 1150820 ? Sl Aug06 72:54
/opt/soft/jdk/bin/java -cp
/home/work/app/hbase/qktst-qk/regionserver/:/home/work/app/hbase/qktst-qk/regionserver/package//:/home/work/app/hbase/qktst-qk/regionserver/package//lib/*:/home/work/app/hbase/qktst-qk/regionserver/package//*
-Djava.library.path=:/home/work/app/hbase/qktst-qk/regionserver/package/lib/native/:/home/work/app/hbase/qktst-qk/regionserver/package/lib/native/Linux-amd64-64
-Xbootclasspath/p:/home/work/app/hbase/qktst-qk/regionserver/package/lib/hadoop-security-2.0.0-mdh1.1.0.jar
-Xmx10240m -Xms10240m -Xmn1024m -XX:MaxDirectMemorySize=1024m
-XX:MaxPermSize=512m
-Xloggc:/home/work/app/hbase/qktst-qk/regionserver/stdout/regionserver_gc_20140806-211157.log
-Xss256k -XX:PermSize=64m -XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=/home/work/app/hbase/qktst-qk/regionserver/log
-XX:+PrintGCApplicationStoppedTime -XX:+UseConcMarkSweepGC -verbose:gc
-XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:SurvivorRatio=6
-XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=75
-XX:+UseCMSInitiatingOccupancyOnly -XX:+CMSParallelRemarkEnabled
-XX:+UseNUMA -XX:+CMSClassUnloadingEnabled
-XX:CMSMaxAbortablePrecleanTime=10000 -XX:TargetSurvivorRatio=80
-XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=100 -XX:GCLogFileSize=128m
-XX:CMSWaitDuration=2000 -XX:+CMSScavengeBeforeRemark
-XX:+PrintPromotionFailure -XX:ConcGCThreads=16 -XX:ParallelGCThreads=16
-XX:PretenureSizeThreshold=2097088 -XX:+CMSConcurrentMTEnabled
-XX:+ExplicitGCInvokesConcurrent -XX:+SafepointTimeout
-XX:MonitorBound=16384 -XX:-UseBiasedLocking -XX:MaxTenuringThreshold=3
-Dproc_regionserver
-Djava.security.auth.login.config=/home/work/app/hbase/qktst-qk/regionserver/jaas.conf
-Djava.net.preferIPv4Stack=true
-Dhbase.log.dir=/home/work/app/hbase/qktst-qk/regionserver/log
-Dhbase.pid=36663 -Dhbase.cluster=qktst-qk -Dhbase.log.level=debug
-Dhbase.policy.file=hbase-policy.xml
-Dhbase.home.dir=/home/work/app/hbase/qktst-qk/regionserver/package
-Djava.security.krb5.conf=/home/work/app/hbase/qktst-qk/regionserver/krb5.conf
-Dhbase.id.str=work org.apache.hadoop.hbase.regionserver.HRegionServer start
[work@hadoop ~]$ jinfo 36663 > tobe.jinfo
Attaching to process ID 36663, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 20.12-b01
[work@hadoop ~]$ ps aux |grep "qktst" |grep "RegionServer"
work 36663 0.1 1.7 24157828 1151008 ? Tl Aug06 72:54
/opt/soft/jdk/bin/java -cp
/home/work/app/hbase/qktst-qk/regionserver/:/home/work/app/hbase/qktst-qk/regionserver/package//:/home/work/app/hbase/qktst-qk/regionserver/package//lib/*:/home/work/app/hbase/qktst-qk/regionserver/package//*
-Djava.library.path=:/home/work/app/hbase/qktst-qk/regionserver/package/lib/native/:/home/work/app/hbase/qktst-qk/regionserver/package/lib/native/Linux-amd64-64
-Xbootclasspath/p:/home/work/app/hbase/qktst-qk/regionserver/package/lib/hadoop-security-2.0.0-mdh1.1.0.jar
-Xmx10240m -Xms10240m -Xmn1024m -XX:MaxDirectMemorySize=1024m
-XX:MaxPermSize=512m
-Xloggc:/home/work/app/hbase/qktst-qk/regionserver/stdout/regionserver_gc_20140806-211157.log
-Xss256k -XX:PermSize=64m -XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=/home/work/app/hbase/qktst-qk/regionserver/log
-XX:+PrintGCApplicationStoppedTime -XX:+UseConcMarkSweepGC -verbose:gc
-XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:SurvivorRatio=6
-XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=75
-XX:+UseCMSInitiatingOccupancyOnly -XX:+CMSParallelRemarkEnabled
-XX:+UseNUMA -XX:+CMSClassUnloadingEnabled
-XX:CMSMaxAbortablePrecleanTime=10000 -XX:TargetSurvivorRatio=80
-XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=100 -XX:GCLogFileSize=128m
-XX:CMSWaitDuration=2000 -XX:+CMSScavengeBeforeRemark
-XX:+PrintPromotionFailure -XX:ConcGCThreads=16 -XX:ParallelGCThreads=16
-XX:PretenureSizeThreshold=2097088 -XX:+CMSConcurrentMTEnabled
-XX:+ExplicitGCInvokesConcurrent -XX:+SafepointTimeout
-XX:MonitorBound=16384 -XX:-UseBiasedLocking -XX:MaxTenuringThreshold=3
-Dproc_regionserver
-Djava.security.auth.login.config=/home/work/app/hbase/qktst-qk/regionserver/jaas.conf
-Djava.net.preferIPv4Stack=true
-Dhbase.log.dir=/home/work/app/hbase/qktst-qk/regionserver/log
-Dhbase.pid=36663 -Dhbase.cluster=qktst-qk -Dhbase.log.level=debug
-Dhbase.policy.file=hbase-policy.xml
-Dhbase.home.dir=/home/work/app/hbase/qktst-qk/regionserver/package
-Djava.security.krb5.conf=/home/work/app/hbase/qktst-qk/regionserver/krb5.conf
-Dhbase.id.str=work org.apache.hadoop.hbase.regionserver.HRegionServer start
I hope some JVM experts here could help.
$ java -version
java version "1.6.0_37"
Java(TM) SE Runtime Environment (build 1.6.0_37-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01, mixed mode)
