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Update comments on include/rocksdb/perf_context.h 

Summary: Some grammer mistakes in code comments in include/rocksdb/perf_context.h. Also polish it a liitlebit.

Test Plan: Not needed

Reviewers: IslamAbdelRahman, yhchiang, yiwu, andrewkr

Reviewed By: andrewkr

Subscribers: leveldb, andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D56307
This commit is contained in:
sdong 2016-04-04 12:26:01 -07:00
parent 3b977bcdc8
commit 0930e5e99f
1 changed files with 11 additions and 12 deletions
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23
include/rocksdb/perf_context.h
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@ -32,11 +32,11 @@ struct PerfContext {
uint64_t block_decompress_time; // total nanos spent on block decompression
// total number of internal keys skipped over during iteration.
// There are several reasons for it:
// 1. when calling Next(), iterator is in the position of the previous key,
// so that we'll need to skip it. It means this counter will always
// incrmented in Next().
// 2. when calling Next(), needs to skip internal entries for the previous
// key that are overwritten.
// 1. when calling Next(), the iterator is in the position of the previous
// key, so that we'll need to skip it. It means this counter will always
// be incremented in Next().
// 2. when calling Next(), we need to skip internal entries for the previous
// keys that are overwritten.
// 3. when calling Next(), Seek() or SeekToFirst(), after previous key
// before calling Next(), the seek key in Seek() or the beginning for
// SeekToFirst(), there may be one or more deleted keys before the next
@ -46,16 +46,15 @@ struct PerfContext {
// hidden by the tombstones will be included here.
// 4. symmetric cases for Prev() and SeekToLast()
// We sometimes also skip entries of more recent updates than the snapshot
// we read from, but it is not counted.
// we read from, but they are not included in this counter.
//
uint64_t internal_key_skipped_count;
// Total number of deletes and single deletes skipped over during iteration
// When calling Next(), Seek() or SeekToFirst(), after previous key before
// calling Next(), the seek key in Seek() or the beginning for SeekToFirst(),
// there may be one or more deleted keys before the next valid key that the
// operation should place the iterator to. Every deleted key is counted once.
// We don't recount here if there are still older updates invalidated by the
// tombstones.
// When calling Next(), Seek() or SeekToFirst(), after previous position
// before calling Next(), the seek key in Seek() or the beginning for
// SeekToFirst(), there may be one or more deleted keys before the next valid
// key. Every deleted key is counted once. We don't recount here if there are
// still older updates invalidated by the tombstones.
//
uint64_t internal_delete_skipped_count;