DonalEvans edited a comment on pull request #5223:
URL: https://github.com/apache/geode/pull/5223#issuecomment-641366892
The reason for this revert is due to internal tests failing with non-empty
serial gateway sender queues. While shutting down gateway senders, events are
marked as possible duplicates and the queues are not cleared of these events:
`[info 2020/05/27 00:02:35.859 PDT <vm_19_thr_80_peer_4_4_host1_19147>
tid=0x705] Stopped
SerialGatewaySender{id=sender_ds_4_to_ds_3,remoteDsId=3,isRunning
=false,isPrimary =true}`
`[info 2020/05/27 00:02:37.382 PDT <vm_17_thr_69_peer_4_2_host1_19135>
tid=0x8df] Stopped
SerialGatewaySender{id=sender_ds_4_to_ds_1,remoteDsId=1,isRunning
=false,isPrimary =true}`
`[info 2020/05/27 00:02:37.432 PDT <Event Processor for
GatewaySender_sender_ds_4_to_ds_1.1> tid=0x5f]
SerialGatewaySender{id=sender_ds_4_to_ds_1,remoteDsId=1,isRunning
=true,isPrimary =true} : Marking 5 events as possible duplicates`
`[info 2020/05/27 00:02:37.446 PDT <Event Processor for
GatewaySender_sender_ds_4_to_ds_1.0> tid=0x5c]
SerialGatewaySender{id=sender_ds_4_to_ds_1,remoteDsId=1,isRunning
=true,isPrimary =true} : Marking 11 events as possible duplicates`
`[info 2020/05/27 00:02:37.623 PDT <vm_19_thr_80_peer_4_4_host1_19147>
tid=0x705] Stopped
SerialGatewaySender{id=sender_ds_4_to_ds_2,remoteDsId=2,isRunning
=false,isPrimary =true}`
`[info 2020/05/27 00:02:39.656 PDT <vm_19_thr_80_peer_4_4_host1_19147>
tid=0x705] Stopped
SerialGatewaySender{id=sender_ds_4_to_ds_1,remoteDsId=1,isRunning
=false,isPrimary =true}`
Following the above log output, we see 16 events in in the
`unprocessedEventMapSize` stat for the gateway sender in question (each sender
has two dispatcher threads in this case, so 5 + 11 = 16).
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