mirror of https://github.com/citusdata/citus.git
6de2a09d79
In short, add wrappers around Postgres' AddWaitEventToSet() and ModifyWaitEvent(). AddWaitEventToSet()/ModifyWaitEvent*() may throw hard errors. For example, when the underlying socket for a connection is closed by the remote server and already reflected by the OS, however Citus hasn't had a chance to get this information. In that case, if replication factor is >1, Citus can failover to other nodes for executing the query. Even if replication factor = 1, Citus can give much nicer errors. So CitusAddWaitEventSetToSet()/CitusModifyWaitEvent() simply puts AddWaitEventToSet()/ModifyWaitEvent() into a PG_TRY/PG_CATCH block in order to catch any hard errors, and returns this information to the caller. |
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