[FLINK-22592][runtime] numBuffersInLocal is always zero when using unaligned checkpoints

[SteNicholas]

What is the purpose of the change

numBuffersInLocal is always zero when using unaligned checkpoints, because LocalRecoveredInputChannel#toInputChannelInternal is passing wrong parameter to the constructor of LocalInputChannel for twice numBytesIn. toInputChannelInternal should pass the numBuffersIn to the LocalInputChannel constructor.

Brief change log

• LocalRecoveredInputChannel#toInputChannelInternal passes the numBuffersIn to the LocalInputChannel constructor for the numBuffersIn parameter.

Verifying this change

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

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Last check on commit 0fa29a2 (Sat Aug 28 12:08:31 UTC 2021)

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[SteNicholas]

@pnowojski , if you are available, please help to review this simple change.

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CI report:

• 0fa29a2 Azure: SUCCESS

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[xintongsong]

LGTM. Merging this.