[issue 513] fix batch size limit validation

[zzzming]

Fixes #513

fix batch size limit validation

Motivation

The current batch size validation is incorrect.

Modifications

The batch max size should be used to compare against the current size. The message should be flushed when the max size is reached.

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

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): ( no)
• The public API: (no)
• The schema: (no)
• The default values of configurations: (no)
• The wire protocol: ( no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[wolfstudy]

@zzzming Thanks work for this, the change LGTM +1, please fix CI error.

[freeznet]

LGTM

[wolfstudy]

@zzzming Any update for this change?

[wolfstudy]

Please merge master code and fix CI error, thanks.

[wolfstudy]

@zzzming please merge master code and fix conflict