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Add comments to options.bottommost_compression (#8415)

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Summary:
Add comments to options.bottommost_compression for options.num_levels=1

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8415

Reviewed By: ajkr

Differential Revision: D29181997

fbshipit-source-id: 5f0f49470f75d796320ecb24d5dc4ef4eb6fbe0f
This commit is contained in:
sdong 2021-07-08 10:50:08 -07:00 committed by Facebook GitHub Bot
parent ac3f3f3719
commit f127d459ad
1 changed files with 6 additions and 2 deletions
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8
include/rocksdb/options.h
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@ -211,14 +211,18 @@ struct ColumnFamilyOptions : public AdvancedColumnFamilyOptions {
CompressionType compression;
// Compression algorithm that will be used for the bottommost level that
// contain files.
// contain files. The behavior for num_levels = 1 is not well defined.
// Right now, with num_levels = 1, all compaction outputs will use
// bottommost_compression and all flush outputs still use options.compression,
// but the behavior is subject to change.
//
// Default: kDisableCompressionOption (Disabled)
CompressionType bottommost_compression = kDisableCompressionOption;
// different options for compression algorithms used by bottommost_compression
// if it is enabled. To enable it, please see the definition of
// CompressionOptions.
// CompressionOptions. Behavior for num_levels = 1 is the same as
// options.bottommost_compression.
CompressionOptions bottommost_compression_opts;
// different options for compression algorithms