StevenLuMT opened a new pull request, #3368:
URL: https://github.com/apache/bookkeeper/pull/3368
Descriptions of the changes in this PR:
### Motivation
bookie flush mainly composed of three pieces:
1. flush-entrylog: it's flushing entrylog
2. flush-locations-index: it's flushing entrly location index, use
**sync** mode to flush
3. flush-ledger-index: it's flushing ledger metadata index, this
index(LedgerMetadataIndex) use **async** mode to flush
sync is different from async：
- sync mode:
1. create a batch;
5. add msg to the batch
6. call method(batch.flush) to flush the batch
- async mode:
1. just call method(sync) to write the data
2. the rocksdb server will be timed to flush the data
### Changes
1. add async or sync for : ledger metadata index rocksdb write
2. add switch to open this feature, default not open, use default async
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