tree dc1e17fc415305bc51ca0679d4adb80387f9afaa
parent 05af76fa4b7f00f439828c5dc0725381b01c7ad5
author Han-Wen Nienhuys <hanwen@google.com> 1519754955 +0100
committer Han-Wen Nienhuys <hanwen@google.com> 1520951562 +0100

Surface LockFailureException as 503 Service Unavailable

Lock failures are often transient errors, either due to transaction
races or lagging replication. Using a separate error code lets admins
and users see the difference between Gerrit programmer errors (code
500) and unfortunate but transient system lag (503).

Change-Id: Id7f0722012238505221780b581280194ade3a5e0