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Posted to user@cassandra.apache.org by Chris Burroughs <ch...@gmail.com> on 2013/11/27 01:19:35 UTC
MiscStage Backup
I'm trying to debug a node that has a backup in MiscStage. Starting a
bit under 24 hours ago the number of Pending tasks jumped to a bit under
400 and hovered around there. It looks like repair requests from other
nodes (tpstats on this node shows AntiEntropySessions: 0, 0, 0, which I
think indicates it did not originate the repair). After each MiscStage
task completes a series of Streams are kicked off.
I am confused why MiscStage is backing up:
(A) This node has only been down a few hours over the past week so it
should not be wildly out of sync
(B) no other node in this cluster has had a comparable backup of
pending Misc stages.
Repairs are run on all nodes once a week. Physical resources on this
node are not particularity saturated compared to the rest of the
cluster; reads are slower but I can't tell cause from effect in that case.
Graph of MiscStage pending tasks: http://imgur.com/sHqHTvt
This is with a 1.2.11-ish dual-DC vnode cluster.