cc487ba367
Summary: ## Background Compaction statistics are collected at various levels across different classes and structs. * `InternalStats::CompactionStats`: Per-level Compaction Stats within a job (can be at subcompaction level which later get aggregated to the compaction level) * `InternalStats::CompactionStatsFull`: Contains two per-level compaction stats - `output_level_stats` for primary output level stats and `proximal_level_stats` for proximal level stats. Proximal level statistics are only relevant when using Tiered Storage with the per-key placement feature enabled. * `InternalStats::CompactionOutputsStats`: Simplified version of `InternalStats::CompactionStats`. Only has a subset of fields from `InternalStats::CompactionStats` * `CompactionJobStats`: Job-level Compaction Stats. (can be at subcompaction level which later get aggregated to the compaction level) Please note that some fields in Job-level stats are not in Per-level stats and they don't map 1-to-1 today. ## Issues * In non-remote compactions, proximal level compaction statistics were not being aggregated into job-level statistics. Job level statistics were missing stats for proximal level for tiered storage compactions with per-key-replacement feature enabled. * During remote compactions, proximal level compaction statistics were pre-aggregated into job-level statistics on the remote side. However, per-level compaction statistics were not part of the serialized compaction result, so that primary host lost that information and weren't able to populate `per_key_placement_comp_stats_` and `internal_stats_.proximal_level_stats` properly during the installation. * `TieredCompactionTest` was only checking if (expected stats > 0 && actual stats > 0) instead actual value comparison ## Fixes * Renamed `compaction_stats_` to `internal_stats_` for `InternalStats::CompactionStatsFull` in `CompactionJob` for better readability * Removed the usage of `InternalStats::CompactionOutputsStats` and consolidated them to `InternalStats::CompactionStats`. * Remote Compactions now include the internal stats in the serialized `CompactionServiceResult`. `output_level_stats` and `proximal_level_stats` get later propagated in sub_compact output stats accordingly. * `CompactionJob::UpdateCompactionJobStats()` now takes `CompactionStatsFull` and aggregates the `proximal_level_stats` as well * `TieredCompactionTest` is now doing the actual value comparisons for input/output file counts and record counts. Follow up is needed to do the same for the bytes read / written. Pull Request resolved: https://github.com/facebook/rocksdb/pull/13464 Test Plan: Unit Tests updated to verify stats ``` ./compaction_service_test ``` ``` ./tiered_compaction_test ``` Reviewed By: pdillinger Differential Revision: D71220393 Pulled By: jaykorean fbshipit-source-id: ad70bffd9614ced683f90c7570a17def9b5c8f3f
RocksDB: A Persistent Key-Value Store for Flash and RAM Storage
RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)
This code is a library that forms the core building block for a fast key-value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it especially suitable for storing multiple terabytes of data in a single database.
Start with example usage here: https://github.com/facebook/rocksdb/tree/main/examples
See the github wiki for more explanation.
The public interface is in include/. Callers should not include or
rely on the details of any other header files in this package. Those
internal APIs may be changed without warning.
Questions and discussions are welcome on the RocksDB Developers Public Facebook group and email list on Google Groups.
License
RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.