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Accumulo >> mail # user >> Table deletion got stuck

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Table deletion got stuck
When deleting tables, sometimes the operation get stuck for hours with
table status "UNKNOWN" shown in the monitor page. The only relevant
logs I can find are similar to this:

[tableOps.CleanUp] DEBUG: Still waiting for table to be deleted: is
locationState: is<<@(null,[43b1b039a081368],null)

It happens to a few tables in our cluster and most of them are hosted
by one tablet server, so I killed the tablet server to force the
tablets to be reassigned to other servers. The tables got deleted
successfully after that. I'm wondering what I should do to solve
problems like this. Right now, we still have a bunch of tables with
status "UNKNOWN". I'm wondering if I need to find the tablet servers
hosting those tables and restart them.

Btw, the swappiness in our cluster is set to 60 now instead of the
recommended value 10.