heap usage and limit reporting doesn't work as expected when using G1 GC
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Key: HBASE-1648
URL: https://issues.apache.org/jira/browse/HBASE-1648
Project: Hadoop HBase
Issue Type: Bug
Environment: Linux Centos x86_64 5.3, Sun JDK 1.6.0_14 (HotSpot 64-Bit
Server VM build 14.0-b16)
Reporter: Andrew Purtell
Priority: Minor
Getting some early experience with the G1 GC.
Running with -Xmx1000m and HBASE_OPTS set to "-XX:+UnlockExperimentalVMOpts
-XX:+UseG1GC". Regionserver heap use reports are not of much use:
{noformat}
hbase(main):001:0> status 'simple'
3 live servers
test3:60020 1247389283042
requests=0, regions=1, usedHeap=0, maxHeap=41
test2:60020 1247389219994
requests=0, regions=1, usedHeap=0, maxHeap=41
test4:60020 1247389324563
requests=0, regions=2, usedHeap=0, maxHeap=41
0 dead servers
{noformat}
top is about right:
{noformat}
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
23988 hadoop 24 0 1492m 98m 10m S 0.0 2.5 0:02.65 java
{noformat}
Incidentally, don't try -XX:+UseG1GC and -XX:+DoEscapeAnalysis together or the
JVM will rapidly segfault.
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