Recovery thread updating standby partition writes in single writes instead of using writeBatch

[patkivikram]

Checklist

• [ x] I have included information about relevant versions
• [x ] I have verified that the issue persists when using the master branch of Faust.

Steps to reproduce

This issue is after recovery is complete the standby partition views should be updated in batches but is not due to the check in _may_signal_recovery_end()

Expected behavior

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Actual behavior

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Full traceback

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Versions

• Python version 3.8
• Faust version 0.3.0
• Operating system Centos75
• Kafka version 2.4
• RocksDB version (if applicable) 6.10.3