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Booking 8 ad delivery issues

At about 11.15 on May 27th, one of four booking 8 admatchers started crashing. Roll-back to the previous version is being done so that fault isolation can be done.

11.25: the rollback was completed for the faulty admatcher.

11.26: roll-forward again. Issue resolved.

Effects: about one quarter of ad requests failed during the incident.

Root cause: a zombie process on the failing admatcher had claimed a socket needed by live processes.

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