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Jonathan Ellis edited comment on CASSANDRA-8860 at 3/1/15 3:23 AM: ------------------------------------------------------------------- That's a lot of complexity for something whose benefit I'm unclear on (I'm talking about the "ignore cold sstables" feature). To the best of my knowledge, CASSANDRA-8635 has never been observed as a problem in the wild. I'd be in favor of reverting it and documenting "don't enable cold sstable elision if you do a lot of overwrites." was (Author: jbellis): That's a lot of complexity for something whose benefit I'm unclear on (I'm talking about the "ignore cold sstables feature"). To the best of my knowledge, CASSANDRA-8635 has never been observed as a problem in the wild. I'd be in favor of reverting it and documenting "don't enable cold sstable elision if you do a lot of overwrites." > Too many java.util.HashMap$Entry objects in heap > ------------------------------------------------ > > Key: CASSANDRA-8860 > URL: https://issues.apache.org/jira/browse/CASSANDRA-8860 > Project: Cassandra > Issue Type: Bug > Environment: Cassandra 2.1.3, jdk 1.7u51 > Reporter: Phil Yang > Assignee: Phil Yang > Fix For: 2.1.4 > > Attachments: 8860-v2.txt, 8860.txt, cassandra-env.sh, cassandra.yaml, > jmap.txt, jstack.txt, jstat-afterv1.txt, jstat-afterv2.txt, jstat-before.txt > > > While I upgrading my cluster to 2.1.3, I find some nodes (not all) may have > GC issue after the node restarting successfully. Old gen grows very fast and > most of the space can not be recycled after setting its status to normal > immediately. The qps of both reading and writing are very low and there is no > heavy compaction. > Jmap result seems strange that there are too many java.util.HashMap$Entry > objects in heap, where in my experience the "[B" is usually the No1. > If I downgrade it to 2.1.1, this issue will not appear. > I uploaded conf files and jstack/jmap outputs. I'll upload heap dump if > someone need it. -- This message was sent by Atlassian JIRA (v6.3.4#6332)