thanks for your reply, Kirsch. yes , i have analyzed using MAT, the output for memory leak is as follows: [image: 内嵌图片 1]
2016-08-26 14:34 GMT+08:00 Harald Kirsch <harald.kir...@raytion.com>: > There is hardly any way anyone can guess what happens there from just the > numbers. > > What you should do is start Kafka with -XX:+HeapDumpOnOutOfMemoryError, > possibly even reduce the Xmx to 500MB and let it bomb out. Then you take a > look at the generated heap dump with the Eclipse Memory Analyzer ( > https://eclipse.org/mat/downloads.php). Check the dominator tree and see > where most of the memory is used. From this figure out why it was not > released. > > Harald. > > > On 26.08.2016 07:45, 黄川 wrote: > >> is there anybody can help me? >> >> 2016-08-23 8:49 GMT+08:00 黄川 <buptst...@gmail.com>: >> >> Hi, I am using kafka_2.11-0.9.0.1, there are multiple of warnings occur >>> in kafkaServer.out: >>> java.lang.OutOfMemoryError: Java heap space. >>> >>> >>> - the jstat output like this: >>> >>> # jstat -gc 28591 >>> S0C S1C S0U S1U EC EU OC OU MC >>> MU CCSC CCSU YGC YGCT FGC FGCT GCT >>> 0.0 0.0 0.0 0.0 18432.0 9216.0 1030144.0 1029128.8 >>> 26240.0 25918.9 3456.0 3398.8 34673 1104.062 10772 37219.665 38323.727 >>> >>> >>> - kafkaServer-gc.log: >>> >>> 2016-08-19T08:40:59.352+0800: 84889.380: [Full GC (Allocation Failure) >>> 1017M->1017M(1024M), 3.3727202 secs] >>> [Eden: 0.0B(51.0M)->0.0B(51.0M) Survivors: 0.0B->0.0B Heap: >>> 1017.7M(1024.0M)->1017.7M(1024.0M)], [Metaspace: >>> 26056K->26056K(1073152K)] >>> >>> it seems that full gc can not recycle any memory any more.My gc settings >>> is as follows: >>> -Xmx1G >>> -Xms1G >>> -XX:+UseG1GC >>> -XX:MaxGCPauseMillis=20 >>> -XX:InitiatingHeapOccupancyPercent=35 >>> -XX:+DisableExplicitGC >>> -Djava.awt.headless=true >>> -Xloggc:/var/log/kafka/kafkaServer-gc.log >>> -verbose:gc >>> -XX:+PrintGCDetails >>> -XX:+PrintGCDateStamps >>> -XX:+PrintGCTimeStamps >>> -Dcom.sun.management.jmxremote >>> -Dcom.sun.management.jmxremote.authenticate=false >>> -Dcom.sun.management.jmxremote.ssl=false >>> -Dkafka.logs.dir=/var/log/kafka >>> -Dlog4j.configuration=file:/usr/lib/kafka/bin/../config/log4j.properties >>> >>> >>
