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For Greenplum Database master mirroring, controls updates to the active master. If the number of WAL segment files that have not been processed by the walsender exceeds this value, Greenplum Database updates the active master.

If the number of segment files does not exceed the value, Greenplum Database blocks updates to the to allow the walsender process the files. If all WAL segments have been processed, the active master is updated.

Value Range Default Set Classifications
0 - 64 1 master