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Fix a bug handling multiget index I/O error. (#9993)

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Summary:
In one path of BlockBasedTable::MultiGet(), Next() is directly called after calling Seek() against the index iterator. This might cause crash if an I/O error happens in Seek().
The bug is discovered in crash test.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9993

Test Plan: See existing CI tests pass.

Reviewed By: anand1976

Differential Revision: D36381758

fbshipit-source-id: a11e0aa48dcee168c2554c33b532646ffdb68877
This commit is contained in:
sdong 2022-05-13 13:15:10 -07:00 committed by Facebook GitHub Bot
parent b58a1a035b
commit c4cd8e1acc
2 changed files with 4 additions and 0 deletions
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1
HISTORY.md
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@ -5,6 +5,7 @@
* Fixed a bug where RocksDB could corrupt DBs with `avoid_flush_during_recovery == true` by removing valid WALs, leading to `Status::Corruption` with message like "SST file is ahead of WALs" when attempting to reopen.
* Fixed a bug in async_io path where incorrect length of data is read by FilePrefetchBuffer if data is consumed from two populated buffers and request for more data is sent.
* Fixed a CompactionFilter bug. Compaction filter used to use `Delete` to remove keys, even if the keys should be removed with `SingleDelete`. Mixing `Delete` and `SingleDelete` may cause undefined behavior.
* Fixed a bug which might cause process crash when I/O error happens when reading an index block in MultiGet().
### New Features
* DB::GetLiveFilesStorageInfo is ready for production use.

3
table/block_based/block_based_table_reader.cc
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@ -2928,6 +2928,9 @@ void BlockBasedTable::MultiGet(const ReadOptions& read_options,
}
if (first_block) {
iiter->Seek(key);
if (!iiter->Valid()) {
break;
}
}
first_block = false;
iiter->Next();