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https://issues.apache.org/jira/browse/CASSANDRA-7845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14114133#comment-14114133
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Robert Stupp commented on CASSANDRA-7845:
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Will do the upgrade again - but with data/cl/sc/cfg backed up before and after
the upgrade to be able to reproduce it. Maybe it's reproducible on a single
node with data from one of the "failing" nodes. We did not see any data loss -
just these strange load numbers.
> Negative load of C* nodes
> -------------------------
>
> Key: CASSANDRA-7845
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7845
> Project: Cassandra
> Issue Type: Bug
> Reporter: Robert Stupp
>
> I've completed two C* workshops. Both groups also did an upgrade of C* 2.0.9
> to 2.1.0rc6 in a 6 node multi-DC cluster.
> Both groups encountered the same phenomenon that "nodetool status" and
> OpsCenter report a negative load (data size) of most (not all) nodes. I did
> not take the phenomenon seriously for the first group, because there were
> only operations guys that "did their best to crash the cluster". But the
> second groups did nothing seriously wrong.
> 2.0.9 configuration was the default one with just changed directories (data,
> cl, caches) and cluster name. Configurations of 2.1.0rc6 nodes matched the
> config of 2.0.9 - they just removed 5 config parameters that were removed in
> 2.1. They did not run any repair or forced a compaction.
> After a rolling restart both "nodetool status" and OpsCenter report the
> correct load.
> I was not able to reproduce this locally.
> I have a third group tomorrow and hope to have some time to do the upgrade
> again. Anything that I can check? I think it would be possible to grab the
> data files from at least one node for further analysis. Anything else I can
> do to check that?
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