Handle Cassandra unavailability when accepting a new report.

Bug #1167838 reported by Evan
6
This bug affects 1 person
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Daisy
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Bug Description

We often get AllServersUnavailable and MaximumRetryException when writing to Cassandra occasionally throughout the day.

https://errors.ubuntu.com/oops-local/2013-04-10/02045.daisy.ubuntu.com2
https://errors.ubuntu.com/oops-local/2013-04-10/01622.daisy.ubuntu.com1

Rather than half-write the data for a new report, bucket, or metadata, we should back out inserts by attempting to delete them on failure where it is safe to do so.

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