pasha-kuznetsov opened a new issue #861: slf4j logging: use {} formatting
instead of string concatenation
URL: https://github.com/apache/bookkeeper/issues/861
Currently logging is done via both `{}` slf4j formatting, and `+` string
concatenation. The former `{}` is preferrable for consistency, readability and
[performance](https://www.slf4j.org/faq.html#logging_performance).
**Example**
The following
```
LOG.debug("Unsetting success for ledger: " + lh.ledgerId + " entry: " +
entryId
+ " bookie index: " + bookieIndex);
```
would be changed to
```
LOG.debug("Unsetting success for ledger: {} entry: {} bookie index: {}",
lh.ledgerId, entryId, bookieIndex);
```
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