Hi cassandra list,
we are having in issue in one of our Cassandra clusters where all 3
nodes with RF 3 have 22 pending tasks (nodetool compactionstats) since
mid of April that are never be executed. Even after a restart they show up.
It started with Cassandra 1.1.10 and on Friday we've migrated to 1.2.6
and now we have the issue that flushes are no longer executed
automatically - we have to do them every hour by hand (nodetool flush)
in order to keep the nodes on an acceptable utilizatzion level. Without
manual flush the CPU goes mad after a couple of hours on each instance.
We just added a forth node to the cluster and after the join it showed 0
pending tasks. After decommissioning one of the old nodes the new node
now shows 39 pending tasks that are apparently also stuck, even after 1h
of idle time and a manual "nodetool compact":
$ nodetool compactionstats
pending tasks: 39
Active compaction remaining time : n/a
I think the two issues are related since in the other clusters with 3
and 10 nodes we don't have either of the issues.
Is there a way to find out which tasks are pending? Is there a way to
cancel them?
Cheers
Steffen
--
Steffen Rusitschka
CTO
MegaZebra GmbH
Steinsdorfstraße 2
81538 München
Phone +49 89 80929577
[email protected]
Challenge me at www.megazebra.com
MegaZebra GmbH
Geschäftsführer: Henning Kosmack, Christian Meister, Steffen Rusitschka
Sitz der Gesellschaft: München, HRB 177947
