Make walreceiver send a reply after receiving data but before flushing it.
Make walreceiver send a reply after receiving data but before flushing it.

It originally worked this way, but was changed by commit
a8a8a3e0965201df88bdfdff08f50e5c06c552b7, since which time it's been impossible
for walreceiver to ever send a reply with write_location and flush_location
set to different values.

arcivanov/postgres-xl,zeroae/postgres-xl,pavanvd/postgres-xl,ovr/postgres-xl,xinzweb/gpdb,50wu/gpdb,adam8157/gpdb,arcivanov/postgres-xl,greenplum-db/gpdb,50wu/gpdb,postmind-net/postgres-xl,lisakowen/gpdb,jmcatamney/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,jmcatamney/gpdb,oberstet/postgres-xl,yazun/postgres-xl,50wu/gpdb,tpostgres-projects/tPostgres,lisakowen/gpdb,xinzweb/gpdb,snaga/postgres-xl,Postgres-XL/Postgres-XL,yazun/postgres-xl,xinzweb/gpdb,techdragon/Postgres-XL,pavanvd/postgres-xl,ashwinstar/gpdb,postmind-net/postgres-xl,adam8157/gpdb,adam8157/gpdb,ovr/postgres-xl,Postgres-XL/Postgres-XL,jmcatamney/gpdb,jmcatamney/gpdb,yazun/postgres-xl,ashwinstar/gpdb,kmjungersen/PostgresXL,jmcatamney/gpdb,kmjungersen/PostgresXL,zeroae/postgres-xl,zeroae/postgres-xl,techdragon/Postgres-XL,greenplum-db/gpdb,ashwinstar/gpdb,oberstet/postgres-xl,50wu/gpdb,snaga/postgres-xl,kmjungersen/PostgresXL,yazun/postgres-xl,techdragon/Postgres-XL,postmind-net/postgres-xl,greenplum-db/gpdb,lisakowen/gpdb,snaga/postgres-xl,ashwinstar/gpdb,xinzweb/gpdb,kmjungersen/PostgresXL,50wu/gpdb,greenplum-db/gpdb,techdragon/Postgres-XL,xinzweb/gpdb,zeroae/postgres-xl,oberstet/postgres-xl,greenplum-db/gpdb,adam8157/gpdb,greenplum-db/gpdb,arcivanov/postgres-xl,adam8157/gpdb,arcivanov/postgres-xl,xinzweb/gpdb,pavanvd/postgres-xl,xinzweb/gpdb,greenplum-db/gpdb,postmind-net/postgres-xl,kmjungersen/PostgresXL,tpostgres-projects/tPostgres,adam8157/gpdb,tpostgres-projects/tPostgres,lisakowen/gpdb,snaga/postgres-xl,adam8157/gpdb,50wu/gpdb,adam8157/gpdb,ashwinstar/gpdb,50wu/gpdb,Postgres-XL/Postgres-XL,pavanvd/postgres-xl,jmcatamney/gpdb,oberstet/postgres-xl,zeroae/postgres-xl,ovr/postgres-xl,jmcatamney/gpdb,ashwinstar/gpdb,postmind-net/postgres-xl,oberstet/postgres-xl,ashwinstar/gpdb,snaga/postgres-xl,lisakowen/gpdb,yazun/postgres-xl,xinzweb/gpdb,tpostgres-projects/tPostgres,lisakowen/gpdb,ovr/postgres-xl,lisakowen/gpdb,tpostgres-projects/tPostgres,arcivanov/postgres-xl,techdragon/Postgres-XL,jmcatamney/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,Postgres-XL/Postgres-XL,Postgres-XL/Postgres-XL,ovr/postgres-xl,arcivanov/postgres-xl,50wu/gpdb