lokeshj1703 opened a new pull request #1690:
URL: https://github.com/apache/ozone/pull/1690
## What changes were proposed in this pull request?
On restart the transactions are reapplied for an existing ratis pipeline.
ContainerStateMachine#applyTransaction while processing future can throw
NullPointerException leading to the future being completed exceptionally.
```
future.thenApply(r -> {
if (trx.getServerRole() == RaftPeerRole.LEADER) {
long startTime = (long) trx.getStateMachineContext();
metrics.incPipelineLatency(cmdType,
Time.monotonicNowNanos() - startTime);
}
```
In the above code snippet trx.getStateMachineContext() will be null during
restart and this fails the future itself without updating the
applyTransactionCompletionMap. As a result the lastAppliedIndex is not updated
for the server and server is stuck in leader not ready state.
## What is the link to the Apache JIRA
https://issues.apache.org/jira/browse/HDDS-4580
## How was this patch tested?
Existing UT
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