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From "Frisch, Michael" <>
Subject Leak detected during repair (v2.1.8)
Date Wed, 29 Jul 2015 13:56:17 GMT
ERROR [Reference-Reaper:1] 2015-07-29 12:34:45,941 - LEAK DETECTED: a reference
(org.apache.cassandra.utils.concurrent.Ref$State@52628658) to class$InstanceTidier@1113728425:/data/cassandra/data/KSName/CFName/snapshots/8179b820-35ec-11e5-a75f-ed9e19db78e9/KSName-CFName-ka-5544
was not released before the reference was garbage collected

ERROR [Reference-Reaper:1] 2015-07-29 12:34:45,948 - LEAK DETECTED: a reference
(org.apache.cassandra.utils.concurrent.Ref$State@4eef1d76) to class$InstanceTidier@880236150:/data/cassandra/data/KSName/CFName/snapshots/8179b820-35ec-11e5-a75f-ed9e19db78e9/KSName-CFName-ka-5543
was not released before the reference was garbage collected

I was just wondering if this is a known issue or if others are experiencing this with C* v2.1.8.
 I couldn't find any open tickets in the Jira about these leaks occurring during repairs.
 I've only seen this during repairs and the only commonality that I could find between the
column families that these leaks have been repeated for is that they contain very little data.
 Could there be a race condition that's only hit when repairing very small datasets?  Turning
on debug logging didn't produce any more context like I had hoped for.

- Mike

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