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Add comments for MultiGetBlob() and checks for MultiRead() (#8972)

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Summary:
Add comments for MultiGetBlob() that input argument `offsets` must be
sorted. In addition, add assertion for this condition in debug build.
Repeat the same for RandomAccessFileReader::MultiRead().

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8972

Test Plan: make check

Reviewed By: pdillinger

Differential Revision: D31253205

Pulled By: riversand963

fbshipit-source-id: 98758229b8052f3aeb319d5584026b4de2d220a2
This commit is contained in:
Yanqin Jin 2021-09-29 14:25:43 -07:00 committed by Facebook GitHub Bot
parent 61a63ae2f9
commit 2acffecca1
3 changed files with 14 additions and 0 deletions
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7
db/blob/blob_file_reader.cc
View File

@ -358,11 +358,18 @@ void BlobFileReader::MultiGetBlob(
const autovector<uint64_t>& value_sizes, autovector<Status*>& statuses,
autovector<PinnableSlice*>& values, uint64_t* bytes_read) const {
const size_t num_blobs = user_keys.size();
assert(num_blobs > 0);
assert(num_blobs == offsets.size());
assert(num_blobs == value_sizes.size());
assert(num_blobs == statuses.size());
assert(num_blobs == values.size());
#ifndef NDEBUG
for (size_t i = 0; i < offsets.size() - 1; ++i) {
assert(offsets[i] <= offsets[i + 1]);
}
#endif // !NDEBUG
std::vector<FSReadRequest> read_reqs(num_blobs);
autovector<uint64_t> adjustments;
uint64_t total_len = 0;

1
db/blob/blob_file_reader.h
View File

@ -44,6 +44,7 @@ class BlobFileReader {
CompressionType compression_type, PinnableSlice* value,
uint64_t* bytes_read) const;
// offsets must be sorted in ascending order by caller.
void MultiGetBlob(
const ReadOptions& read_options,
const autovector<std::reference_wrapper<const Slice>>& user_keys,

6
file/random_access_file_reader.cc
View File

@ -224,6 +224,12 @@ IOStatus RandomAccessFileReader::MultiRead(const IOOptions& opts,
(void)aligned_buf; // suppress warning of unused variable in LITE mode
assert(num_reqs > 0);
#ifndef NDEBUG
for (size_t i = 0; i < num_reqs - 1; ++i) {
assert(read_reqs[i].offset <= read_reqs[i + 1].offset);
}
#endif // !NDEBUG
// To be paranoid modify scratch a little bit, so in case underlying
// FileSystem doesn't fill the buffer but return succee and `scratch` returns
// contains a previous block, returned value will not pass checksum.