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Update code comment for options.ttl #7775

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Update code comment for options.ttl #7775

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83c6fbc
Update code comment for options.ttl
siying Dec 16, 2020
080f7be
Fix a grammer mistake
siying Dec 16, 2020
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9 changes: 8 additions & 1 deletion include/rocksdb/advanced_options.h
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Original file line number Diff line number Diff line change
Expand Up @@ -675,7 +675,11 @@ struct AdvancedColumnFamilyOptions {
// Dynamically changeable through SetOptions() API
bool report_bg_io_stats = false;

// Files older than TTL will go through the compaction process.
// Files containing updates older than TTL will go through the compaction
// process. This usually happens in a cascading way so that those entries
// will be compacted to bottommost level/file.
// The feature is used to remove stale entries that have been deleted or
// updated from the file system.
// Pre-req: This needs max_open_files to be set to -1.
// In Level: Non-bottom-level files older than TTL will go through the
// compation process.
Expand All @@ -695,6 +699,9 @@ struct AdvancedColumnFamilyOptions {

// Files older than this value will be picked up for compaction, and
// re-written to the same level as they were before.
// One main use of the feature is to make sure a file goes through compaction
// filters periodically. Users can also use the feature to clear up SST
// files using old format.
//
// A file's age is computed by looking at file_creation_time or creation_time
// table properties in order, if they have valid non-zero values; if not, the
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