Vanlightly opened a new pull request #2862:
URL: https://github.com/apache/bookkeeper/pull/2862
### Motivation
See BP-44 for full motivation
### Changes
Various enhancements related to DbLedgerStorage:
- All DbLedgerStorage stats now report their ledgerDir.
- Read cache hit/misses now differentiated from write cache.
- Read/write cache hit/misses now counters, not OpStatsLoggers.
The OpStatsLoggers are relatively expensive and the counter
values are most important here.
- Stats where thread info useful are now thread-scoped. In
general the focus is on time based metrics for operations
carried out by the read/write thread pools.
- Time spent counters on sub-operations for reads (entry log,
locations index, readahead).
- Flush time started moved to after lock to avoid 200% time
utilization calculations. Can reach 200% because one thread
is busy flushing and another busy waiting on the lock.
- Time spent counters on sub-operations for flushes (entry log,
locations index, ledgers index).
- DbStorage thread reports time utilization.
- SyncThread reports time utilization.
Some new gauges that report configuration values which are useful
for utilization calculations in dashboards/alerts:
- Write cache max size.
- Number of ledger dirs.
- Readahead batch size.
Master Issue: #2834
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