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From "Peng Xiao" <2535...@qq.com>
Subject gc causes C* node hang
Date Thu, 23 Nov 2017 06:49:35 GMT
Hi there,


We have a cluster with two DCs with 2.1.13,sometimes the gc will cause one node hang,and the
application rt will jump to 15s,actually even we have one node down,the rt will not fluctuates
violently. 
We are using Cassandra G1 with the following configuration:


JVM_OPTS="$JVM_OPTS -XX:ParallelGCThreads=5"
JVM_OPTS="$JVM_OPTS -XX:ConcGCThreads=5"
JVM_OPTS="$JVM_OPTS -XX:+ParallelRefProcEnabled"


JVM_OPTS="$JVM_OPTS -XX:+UseG1GC"
JVM_OPTS="$JVM_OPTS -XX:MaxGCPauseMillis=500"
JVM_OPTS="$JVM_OPTS -XX:G1RSetUpdatingPauseTimePercent=5"
JVM_OPTS="$JVM_OPTS -XX:InitiatingHeapOccupancyPercent=25"



Could anyone please advise?





Thanks,
Peng Xiao
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