Since we upgraded to Cassandra 2.1.12, we are noticing that below happens when 
we are trying to bootstrap nodes, and the process just gets stuck. Restarting 
the process / VM does not help. Our nodes are around ~300 GB and run on local 
SSDs and we haven't seen this problem on older versions (specifically 2.1.9).

Is this a known issue / any workarounds ?

ERROR [Reference-Reaper:1] 2016-04-13 20:33:53,394  Ref.java:179 - LEAK 
DETECTED: a reference 
(org.apache.cassandra.utils.concurrent.Ref$State@15e611a3) to class 
 was not released before the reference was garbage collected

Thanks !

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