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Note dynamic options in options.h
Summary: as title Test Plan: n/a Reviewers: igor, yhchiang, rven, sdong Reviewed By: sdong Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D28287
This commit is contained in:
Lei Jin
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29a9161f34
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@ -3,6 +3,7 @@
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## Unreleased
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### Public API changes
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* Introduce SetOptions() API to allow adjusting a subset of options dynamically online
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* Introduce 4 new convenient functions for converting Options from string: GetColumnFamilyOptionsFromMap(), GetColumnFamilyOptionsFromString(), GetDBOptionsFromMap(), GetDBOptionsFromString()
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* Remove WriteBatchWithIndex.Delete() overloads using SliceParts
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* When opening a DB, if options.max_background_compactions is larger than the existing low pri pool of options.env, it will enlarge it. Similarly, options.max_background_flushes is larger than the existing high pri pool of options.env, it will enlarge it.
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@ -191,13 +191,18 @@ struct ColumnFamilyOptions {
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// the next time the database is opened.
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//
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// Default: 4MB
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//
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// Dynamically changeable through SetOptions() API
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size_t write_buffer_size;
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// The maximum number of write buffers that are built up in memory.
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// The default and the minimum number is 2, so that when 1 write buffer
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// is being flushed to storage, new writes can continue to the other
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// write buffer.
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//
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// Default: 2
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//
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// Dynamically changeable through SetOptions() API
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int max_write_buffer_number;
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// The minimum number of write buffers that will be merged together
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@ -260,14 +265,20 @@ struct ColumnFamilyOptions {
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// level-0 compaction will not be triggered by number of files at all.
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//
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// Default: 4
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//
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// Dynamically changeable through SetOptions() API
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int level0_file_num_compaction_trigger;
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// Soft limit on number of level-0 files. We start slowing down writes at this
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// point. A value <0 means that no writing slow down will be triggered by
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// number of files in level-0.
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//
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// Dynamically changeable through SetOptions() API
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int level0_slowdown_writes_trigger;
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// Maximum number of level-0 files. We stop writes at this point.
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//
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// Dynamically changeable through SetOptions() API
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int level0_stop_writes_trigger;
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// Maximum level to which a new compacted memtable is pushed if it
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@ -276,6 +287,8 @@ struct ColumnFamilyOptions {
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// expensive manifest file operations. We do not push all the way to
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// the largest level since that can generate a lot of wasted disk
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// space if the same key space is being repeatedly overwritten.
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//
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// Dynamically changeable through SetOptions() API
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int max_mem_compaction_level;
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// Target file size for compaction.
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@ -286,11 +299,15 @@ struct ColumnFamilyOptions {
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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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//
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// Default: 2MB.
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//
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// Dynamically changeable through SetOptions() API
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uint64_t target_file_size_base;
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// by default target_file_size_multiplier is 1, which means
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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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//
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// Dynamically changeable through SetOptions() API
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int target_file_size_multiplier;
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// Control maximum total data size for a level.
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@ -301,22 +318,31 @@ struct ColumnFamilyOptions {
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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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//
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// Default: 10MB.
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//
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// Dynamically changeable through SetOptions() API
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uint64_t max_bytes_for_level_base;
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// by default 'max_bytes_for_level_base' is 10.
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// Default: 10.
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//
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// Dynamically changeable through SetOptions() API
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int max_bytes_for_level_multiplier;
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// Different max-size multipliers for different levels.
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// These are multiplied by max_bytes_for_level_multiplier to arrive
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// at the max-size of each level.
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//
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// Default: 1
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//
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// Dynamically changeable through SetOptions() API
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std::vector<int> max_bytes_for_level_multiplier_additional;
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// Maximum number of bytes in all compacted files. We avoid expanding
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// the lower level file set of a compaction if it would make the
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// total compaction cover more than
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// (expanded_compaction_factor * targetFileSizeLevel()) many bytes.
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//
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// Dynamically changeable through SetOptions() API
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int expanded_compaction_factor;
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// Maximum number of bytes in all source files to be compacted in a
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@ -326,22 +352,32 @@ struct ColumnFamilyOptions {
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// (source_compaction_factor * targetFileSizeLevel()) many bytes.
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// Default:1, i.e. pick maxfilesize amount of data as the source of
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// a compaction.
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//
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// Dynamically changeable through SetOptions() API
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int source_compaction_factor;
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// Control maximum bytes of overlaps in grandparent (i.e., level+2) before we
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// stop building a single file in a level->level+1 compaction.
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//
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// Dynamically changeable through SetOptions() API
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int max_grandparent_overlap_factor;
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// Puts are delayed 0-1 ms when any level has a compaction score that exceeds
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// soft_rate_limit. This is ignored when == 0.0.
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// CONSTRAINT: soft_rate_limit <= hard_rate_limit. If this constraint does not
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// hold, RocksDB will set soft_rate_limit = hard_rate_limit
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//
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// Default: 0 (disabled)
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//
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// Dynamically changeable through SetOptions() API
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double soft_rate_limit;
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// Puts are delayed 1ms at a time when any level has a compaction score that
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// exceeds hard_rate_limit. This is ignored when <= 1.0.
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//
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// Default: 0 (disabled)
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//
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// Dynamically changeable through SetOptions() API
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double hard_rate_limit;
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// DEPRECATED -- this options is no longer used
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@ -360,10 +396,14 @@ struct ColumnFamilyOptions {
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// conforms to the restrictions.
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//
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// Default: 0
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//
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// Dynamically changeable through SetOptions() API
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size_t arena_block_size;
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// Disable automatic compactions. Manual compactions can still
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// be issued on this column family
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//
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// Dynamically changeable through SetOptions() API
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bool disable_auto_compactions;
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// Purge duplicate/deleted keys when a memtable is flushed to storage.
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@ -388,14 +428,20 @@ struct ColumnFamilyOptions {
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// If KeyMayExist returns false, i.e. the key definitely does not exist, then
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// the delete is a noop. KeyMayExist only incurs in-memory look up.
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// This optimization avoids writing the delete to storage when appropriate.
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//
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// Default: false
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//
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// Dynamically changeable through SetOptions() API
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bool filter_deletes;
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// An iteration->Next() sequentially skips over keys with the same
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// user-key unless this option is set. This number specifies the number
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// of keys (with the same userkey) that will be sequentially
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// skipped before a reseek is issued.
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//
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// Default: 8
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//
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// Dynamically changeable through SetOptions() API
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uint64_t max_sequential_skip_in_iterations;
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// This is a factory that provides MemTableRep objects.
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@ -444,6 +490,8 @@ struct ColumnFamilyOptions {
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// Number of locks used for inplace update
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// Default: 10000, if inplace_update_support = true, else 0.
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//
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// Dynamically changeable through SetOptions() API
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size_t inplace_update_num_locks;
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// existing_value - pointer to previous value (from both memtable and sst).
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@ -490,9 +538,13 @@ struct ColumnFamilyOptions {
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// if prefix_extractor is set and bloom_bits is not 0, create prefix bloom
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// for memtable
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//
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// Dynamically changeable through SetOptions() API
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uint32_t memtable_prefix_bloom_bits;
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// number of hash probes per key
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//
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// Dynamically changeable through SetOptions() API
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uint32_t memtable_prefix_bloom_probes;
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// Page size for huge page TLB for bloom in memtable. If <=0, not allocate
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@ -500,7 +552,8 @@ struct ColumnFamilyOptions {
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// Need to reserve huge pages for it to be allocated. For example:
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// sysctl -w vm.nr_hugepages=20
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// See linux doc Documentation/vm/hugetlbpage.txt
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//
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// Dynamically changeable through SetOptions() API
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size_t memtable_prefix_bloom_huge_page_tlb_size;
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// Control locality of bloom filter probes to improve cache miss rate.
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@ -520,6 +573,8 @@ struct ColumnFamilyOptions {
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// operations in the memtable.
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//
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// Default: 0 (disabled)
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//
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// Dynamically changeable through SetOptions() API
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size_t max_successive_merges;
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// The number of partial merge operands to accumulate before partial
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