Improve TransactionAwareBufferedWriter efficiency [BATCH-2434]

[spring-projects-issues]

Philippe Marschall opened BATCH-2434 and commented

TransactionAwareBufferedWriter offers a number of optimization potentials. First it buffers at the char level. Buffering at the byte level instead saves about 50% memory usage in common cases. Second it does not overwrite any of the #write(String) methods leading to unnecessary intermediate copies.

Together these two changes should help to reduce both live set size and allocation rate.

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Referenced from: pull request #387

[fmbenhassine]

Resolved with #387 .