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a919113fdb
Seastar wrongly limits the number of concurrent submit_to()s to a single
remote shard. This can cause an ABBA deadlock:
fiberA fiberB (x127)
submit_to(0) # lock schema
<- returns
submit_to(0) # lock schema (waits)
submit_to(0) # do work (waits)
The fiberBs wait for fiberA, which in turn waits for a fiberB to return.
While the correct fix is to remote the client-side limit and replace it
with a server-side per-verb limit, we start with a simpler fix that
replaces the blocking lock call with a non-blocking call, removing the
deadlock.
Fixes #1088.
Message-Id: <1459095357-28950-1-git-send-email-avi@scylladb.com>