nats-io / nats-server / 9459700333
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[IMPROVED] Memory based streams and NRG behavior during server restarts (#5506)

Improvements to catchups and health checks.

Improvements to handling snapshots for memory based wals.
With memory based wals we can not use snapshots on restarts, but we do
use them while they are running.
However if a server becomes a leader with no snapshot it will be forced
to stepdown when asked to catchup a follower. So we now inherit a
leaders snapshot.

Also when we tried to truncate on a mismatch, we needed to truncate the
previous index, not current.
When we fail due to the previous entry being compacted away, we would
reset. We now reset the wal to the prior index and use the truncate term
and index.

Lastly if we receive a heartbeat with correct index but newer term just
inherit.
For stream health checks for replicated streams make sure that the
monitor routine is running.
When waiting on consumer assignments at the beginning of the stream
monitor, make sure the consumer monitor is running as well if
replicated.

On a consumer snapshot, register pre-acks as needed.
On stream checkInterestState reset an empty stream to the low ack floor
from all consumers.

Last fix consistency bug with memstore when skipping msgs on empty
stream to ensure first == last + 1.

Signed-off-by: Derek Collison <derek@nats.io>

---------

Signed-off-by: Derek Collison <derek@nats.io>

65664 of 77086 relevant lines covered (85.18%)

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