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improve comment for WalManager (#5350)

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Summary:
att
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5350

Differential Revision: D15496467

Pulled By: miasantreble

fbshipit-source-id: c29c0b143bf4df2040695a82be0feb9814ddb641
This commit is contained in:
Zhongyi Xie 2019-05-24 10:36:26 -07:00 committed by Facebook Github Bot
parent 94c78b11e4
commit 88ff80780b
1 changed files with 6 additions and 0 deletions
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6
db/wal_manager.h
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@ -28,6 +28,10 @@
namespace rocksdb { namespace rocksdb {
#ifndef ROCKSDB_LITE #ifndef ROCKSDB_LITE
// WAL manager provides the abstraction for reading the WAL files as a single
// unit. Internally, it opens and reads the files using Reader or Writer
// abstraction.
class WalManager { class WalManager {
public: public:
WalManager(const ImmutableDBOptions& db_options, WalManager(const ImmutableDBOptions& db_options,
@ -40,6 +44,8 @@ class WalManager {
Status GetSortedWalFiles(VectorLogPtr& files); Status GetSortedWalFiles(VectorLogPtr& files);
// Allow user to tail transaction log to find all recent changes to the
// database that are newer than `seq_number`.
Status GetUpdatesSince( Status GetUpdatesSince(
SequenceNumber seq_number, std::unique_ptr<TransactionLogIterator>* iter, SequenceNumber seq_number, std::unique_ptr<TransactionLogIterator>* iter,
const TransactionLogIterator::ReadOptions& read_options, const TransactionLogIterator::ReadOptions& read_options,