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Summary: Currently, if blob files are enabled (i.e. `enable_blob_files` is true), large values are extracted both during flush/recovery (when SST files are written into level 0 of the LSM tree) and during compaction into any LSM tree level. For certain use cases that have a mix of short-lived and long-lived values, it might make sense to support extracting large values only during compactions whose output level is greater than or equal to a specified LSM tree level (e.g. compactions into L1/L2/... or above). This could reduce the space amplification caused by large values that are turned into garbage shortly after being written at the price of some write amplification incurred by long-lived values whose extraction to blob files is delayed. In order to achieve this, we would like to do the following: - Add a new configuration option `blob_file_starting_level` (default: 0) to `AdvancedColumnFamilyOptions` (and `MutableCFOptions` and extend the related logic) - Instantiate `BlobFileBuilder` in `BuildTable` (used during flush and recovery, where the LSM tree level is L0) and `CompactionJob` iff `enable_blob_files` is set and the LSM tree level is `>= blob_file_starting_level` - Add unit tests for the new functionality, and add the new option to our stress tests (`db_stress` and `db_crashtest.py` ) - Add the new option to our benchmarking tool `db_bench` and the BlobDB benchmark script `run_blob_bench.sh` - Add the new option to the `ldb` tool (see https://github.com/facebook/rocksdb/wiki/Administration-and-Data-Access-Tool) - Ideally extend the C and Java bindings with the new option - Update the BlobDB wiki to document the new option. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10077 Reviewed By: ltamasi Differential Revision: D36884156 Pulled By: gangliao fbshipit-source-id: 942bab025f04633edca8564ed64791cb5e31627d |
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| .. | ||
| clipping_iterator.h | ||
| clipping_iterator_test.cc | ||
| compaction.cc | ||
| compaction.h | ||
| compaction_iteration_stats.h | ||
| compaction_iterator.cc | ||
| compaction_iterator.h | ||
| compaction_iterator_test.cc | ||
| compaction_job.cc | ||
| compaction_job.h | ||
| compaction_job_stats_test.cc | ||
| compaction_job_test.cc | ||
| compaction_picker.cc | ||
| compaction_picker.h | ||
| compaction_picker_fifo.cc | ||
| compaction_picker_fifo.h | ||
| compaction_picker_level.cc | ||
| compaction_picker_level.h | ||
| compaction_picker_test.cc | ||
| compaction_picker_universal.cc | ||
| compaction_picker_universal.h | ||
| compaction_service_test.cc | ||
| file_pri.h | ||
| sst_partitioner.cc | ||