AngersZhuuuu opened a new pull request, #1111:
URL: https://github.com/apache/ratis/pull/1111
## What changes were proposed in this pull request?
When we setting `INSTALL_SNAPSHOT_ENABLED_KEY` as true and when master sync
snapshot to follower,
the status will be PAUSED and won't take snapshot, also follower
StateMachine will call `reinitialize()`.
Then we need to load the the latest snapshot.
```
/**
* Re-initializes the State Machine in PAUSED state. The
* state machine is responsible reading the latest snapshot from the file
system (if any) and
* initialize itself with the latest term and index there including all
the edits.
*/
void reinitialize() throws IOException;
```
But current `SimpleStateMachineStorage` when init(), `latestSnapshot` was
set. But the master's snapshot won't be taken so the `latestSnapshot` won't be
updated to master's snapshot.
So here we should load the latest snapshot and update it before do
reinitialize.
Similar thing was done in alluxio
https://github.com/Alluxio/alluxio/blob/efed93c95e6f1cf3b2131066208f03cfd7821b58/dora/core/server/common/src/main/java/alluxio/master/journal/raft/JournalStateMachine.java#L209-L214
and celeborn also meet such issue.
https://github.com/apache/celeborn/pull/2547
## What is the link to the Apache JIRA
https://issues.apache.org/jira/browse/RATIS-2111
## How was this patch tested?
(Please explain how this patch was tested. Ex: unit tests, manual tests)
(If this patch involves UI changes, please attach a screen-shot; otherwise,
remove this)
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