Revision d3d20dcdca9dc79d893a03dfa611fb1055c28f96 authored by Sagar Vemuri on 11 April 2019, 02:24:25 UTC, committed by Facebook Github Bot on 11 April 2019, 02:31:18 UTC
Summary: Introducing Periodic Compactions. This feature allows all the files in a CF to be periodically compacted. It could help in catching any corruptions that could creep into the DB proactively as every file is constantly getting re-compacted. And also, of course, it helps to cleanup data older than certain threshold. - Introduced a new option `periodic_compaction_time` to control how long a file can live without being compacted in a CF. - This works across all levels. - The files are put in the same level after going through the compaction. (Related files in the same level are picked up as `ExpandInputstoCleanCut` is used). - Compaction filters, if any, are invoked as usual. - A new table property, `file_creation_time`, is introduced to implement this feature. This property is set to the time at which the SST file was created (and that time is given by the underlying Env/OS). This feature can be enabled on its own, or in conjunction with `ttl`. It is possible to set a different time threshold for the bottom level when used in conjunction with ttl. Since `ttl` works only on 0 to last but one levels, you could set `ttl` to, say, 1 day, and `periodic_compaction_time` to, say, 7 days. Since `ttl < periodic_compaction_time` all files in last but one levels keep getting picked up based on ttl, and almost never based on periodic_compaction_time. The files in the bottom level get picked up for compaction based on `periodic_compaction_time`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5166 Differential Revision: D14884441 Pulled By: sagar0 fbshipit-source-id: 408426cbacb409c06386a98632dcf90bfa1bda47
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File | Mode | Size |
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.gitignore | -rw-r--r-- | 200 bytes |
Makefile | -rw-r--r-- | 2.5 KB |
README.md | -rw-r--r-- | 120 bytes |
c_simple_example.c | -rw-r--r-- | 2.6 KB |
column_families_example.cc | -rw-r--r-- | 1.9 KB |
compact_files_example.cc | -rw-r--r-- | 5.7 KB |
compaction_filter_example.cc | -rw-r--r-- | 2.9 KB |
multi_processes_example.cc | -rw-r--r-- | 11.7 KB |
optimistic_transaction_example.cc | -rw-r--r-- | 4.1 KB |
options_file_example.cc | -rw-r--r-- | 4.0 KB |
rocksdb_option_file_example.ini | -rw-r--r-- | 4.6 KB |
simple_example.cc | -rw-r--r-- | 2.4 KB |
transaction_example.cc | -rw-r--r-- | 4.1 KB |
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