pasha-kuznetsov commented on issue #861: slf4j logging: use {} formatting
instead of string concatenation
URL: https://github.com/apache/bookkeeper/issues/861#issuecomment-352123821
Related change is that then many `if (LOG.isDebugEnabled())` checks can be
removed as they are done automatically by slf4j without extra overhead in case
of `{}` formatting, e.g.:
```
if (LOG.isDebugEnabled()) {
LOG.debug("Failed to close ledger {} : ", ledgerId, re);
}
```
is then simplified to
```
LOG.debug("Failed to close ledger {} : ", ledgerId, re);
```
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