There is a bulk import failure in the master shortly after the restart.
2014-03-12 14:10:17,330 [thrift.MasterClientService$Processor] ERROR: Internal error processing wait
java.lang.RuntimeException: java.io.IOException: Filesystem closed
Caused by: java.io.IOException: Filesystem closed
... 2 more
The line in LoadFiles causing the problem:
FSDataOutputStream failFile = fs.create(new Path(errorDir, "failures.txt"), true);
Somehow the filesystem reference generated at the start of the action is closed before the action is done. However, the exception is thrown after tablet servers are asked to do bulk imports, and none of them indicate any trouble performing the bulk import, so I wonder why that marker 18 didn't show up. I don't know enough about this mechanism to hazard a good guess, but it could be that this error is not what caused the problem.
Still, it's my best lead. There are exactly two other waitForTableOperation failures right after this one, but they fail due to interruption of some sort, before the tablet servers are asked to import. Maybe the master is able to try again successfully for these.