For maintenance scripts it is usually harmful to throw an exception.
For jobs the exception was already caught and handled appropriately,
so this can continue as before. For DeferredUpdates it was extremely
harmful to throw an exception. So in the web case, reduce the timeout to
1s and continue as normal if the 1s timeout is reached. This allows the
DeferredUpdate to be throttled without being killed.
In the updater, increase the replication wait timeout to 5 minutes.
ALTER TABLE could indeed cause replication lag, but exiting the update
script with an exception will probably ruin your day. Update actions are
not necessarily efficiently restartable.
Do not call JobQueue::waitForBackups() when jobs are popped. Maybe it
makes sense to call a queue-specific replication wait function for
bulk inserts, like copyJobQueue.php, but doing it when jobs are popped
just makes no sense. Surely the worst that could happen is that the
queue would become locally empty? Removing this waitForBackups() call
avoids waiting for replication twice when JobQueueDB is used.
Bug: T201482
Change-Id: Ia820196caccf9c95007aea12175faf809800f084
