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https://issues.apache.org/jira/browse/CASSANDRA-8860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14344492#comment-14344492
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Phil Yang commented on CASSANDRA-8860:
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I had a look at the code and I have some questions:
In L241, if previ==prevj, it will return an empty list? Should this be
readers.subList(previ, prevj+1)?
In L255, it will find the last sstable that overlaps sstable[i], but sstable[j]
may not have the biggest maxColumnNames so there may be another between i and j
that overlaps sstable[j+1] but sstable[j] doesn't overlap [j+1]. The chain will
be broken. I think we should record the sstable with the biggest maxColumnNames
from i to j and compare it with each sstable[j+1].
> 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.
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