improve comments about target_file_size_base, target_file_size_multiplier, max_bytes_for_level_base, max_bytes_for_level_multiplier Summary:
Summary: as subject Test Plan: compile Reviewers: MarkCallaghan, dhruba Differential Revision: https://reviews.facebook.net/D5499
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@ -163,20 +163,34 @@ struct Options {
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// space if the same key space is being repeatedly overwritten.
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int max_mem_compaction_level;
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// Target file size for compaction. Target file size for level L is
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// (target_file_size_base)^(target_file_size_multiplier).
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// For example, if target_file_size_base is 20MB and
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// target_file_size_multiplier is 2^10, then target file size on level 1
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// will be 200MB, and wiil be 2GB on level 2.
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// Target file size for compaction.
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// target_file_size_base is per-file size for level-1.
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// Target file size for level L can be calculated by
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// target_file_size_base * (target_file_size_multiplier ^ (L-1))
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// For example, if target_file_size_base is 2MB and
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// target_file_size_multiplier is 10, then each file on level-1 will
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// be 2MB, and each file on level 2 will be 20MB,
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// and each file on level-3 will be 200MB.
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// by default target_file_size_base is 2MB.
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int target_file_size_base;
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// by default target_file_size_multiplier is 1, which means
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// by default files in different levels will have similar size.
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int target_file_size_multiplier;
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// Control maximum number of bytes in all compacted files for one level.
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// Maximum number of bytes for level L is
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// (max_bytes_for_level_base)^(max_bytes_for_level_multiplier).
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// Control maximum total data size for a level.
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// max_bytes_for_level_base is the max total for level-1.
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// Maximum number of bytes for level L can be calculated as
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// (max_bytes_for_level_base) * (max_bytes_for_level_multiplier ^ (L-1))
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// For example, if max_bytes_for_level_base is 20MB, and if
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// max_bytes_for_level_multiplier is 10, total data size for level-1
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// will be 20MB, total file size for level-2 will be 200MB,
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// and total file size for level-3 will be 2GB.
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// by default 'max_bytes_for_level_base' is 10MB.
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int max_bytes_for_level_base;
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// by default 'max_bytes_for_level_base' is 10.
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int max_bytes_for_level_multiplier;
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// Maximum number of bytes in all compacted files. We avoid expanding
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