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From Andrew Cooper <>
Subject Large system.Migration CF after upgrade to 1.1
Date Fri, 22 Nov 2013 21:35:49 GMT
We have noticed that a cluster we upgraded to 1.1.6 (from 1.0.*) still has a single large (~4GB)
row in system.Migrations on each cluster node.  We are also seeing heap pressure / Full GC
issues when we do schema updates to this cluster.  If the two are related, is it possible
to somehow remove/truncate the system.Migrations CF?  If I understand correctly, version 1.1
no longer uses this CF, instead using the system.schema_* CF's.   We have multiple clusters
and clusters which were built from scratch at version 1.1 or 1.2 do no have data in system.Migrations.

I would appreciate any advice and I can provide more details if needed.


Andrew Cooper
National Information Solutions CooperativeĀ®
3201 Nygren Drive NW
Mandan, ND 58554
* e-mail:<>
* phone: 866.999.6472 ext 6824
* direct: 701-667-6824

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