[improve][client] Add backoff for seek

[Technoboy-]

Motivation

Currently, only seek doesn't support backoff in consumer side, see :

pulsar/pulsar-client/src/main/java/org/apache/pulsar/client/impl/ConsumerImpl.java

Lines 2151 to 2166 in 2ab184e

	private Optional<CompletableFuture<Void>> seekAsyncCheckState(String seekBy) {
	if (getState() == State.Closing || getState() == State.Closed) {
	return Optional.of(FutureUtil
	.failedFuture(new PulsarClientException.AlreadyClosedException(
	String.format("The consumer %s was already closed when seeking the subscription %s of the"
	+ " topic %s to %s", consumerName, subscription, topicName.toString(), seekBy))));
	}
	if (!isConnected()) {
	return Optional.of(FutureUtil.failedFuture(new PulsarClientException(
	String.format("The client is not connected to the broker when seeking the subscription %s of the "
	+ "topic %s to %s", subscription, topicName.toString(), seekBy))));
	}
	return Optional.empty();
	}

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

[codelipenghui]

Is it possible to add a test to cover the new changes?

[codelipenghui]

If the exception is retriable, I think we should also perform a backoff.

[Technoboy-]

Ah, the server side will response with MetadataError/UnknownError, which we can't retry. I see other methods here, also not handle exception to take a retry.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 69.84127% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.91%. Comparing base (2ab184e) to head (1869a42).
⚠️ Report is 1774 commits behind head on master.

Files with missing lines	Patch %	Lines
...va/org/apache/pulsar/client/impl/ConsumerImpl.java	69.84%	17 Missing and 2 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #20963       +/-   ##
=============================================
+ Coverage     37.11%   72.91%   +35.80%     
- Complexity    12250    32287    +20037     
=============================================
  Files          1698     1875      +177     
  Lines        129813   141668    +11855     
  Branches      14156    15974     +1818     
=============================================
+ Hits          48179   103301    +55122     
+ Misses        75318    30137    -45181     
- Partials       6316     8230     +1914     

Flag	Coverage Δ
inttests	24.74% <41.26%> (+0.35%)	⬆️
systests	25.65% <41.26%> (+0.24%)	⬆️
unittests	72.06% <69.84%> (+39.84%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...va/org/apache/pulsar/client/impl/ConsumerImpl.java	76.87% <69.84%> (+20.99%)	⬆️

... and 1434 files with indirect coverage changes

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[Technoboy-]

Is it possible to add a test to cover the new changes?

Added test.