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Check a status in InstallOutputBlobFiles and Rewrite BatchWriteNewIndices #243

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Check a status in InstallOutputBlobFiles and Rewrite BatchWriteNewIndices #243

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4d0b42f
Add checking a status in BlobGCJob::InstallOutputBlobFiles
apple-ouyang May 4, 2022
187a55b
Rewritte the BatchWriteNewIndices
apple-ouyang May 4, 2022
8740cfa
Avoid unnecessary MergeBlobIndex when gc_merge_rewrite = false
apple-ouyang May 4, 2022
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41 changes: 22 additions & 19 deletions src/blob_gc_job.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -246,7 +246,7 @@ Status BlobGCJob::DoRunGC() {
BlobFileBuilder::OutContexts contexts;
blob_file_builder->Add(blob_record, std::move(ctx), &contexts);

BatchWriteNewIndices(contexts, &s);
s = BatchWriteNewIndices(contexts);

if (!s.ok()) {
break;
Expand All @@ -269,46 +269,46 @@ Status BlobGCJob::DoRunGC() {
return s;
}

void BlobGCJob::BatchWriteNewIndices(BlobFileBuilder::OutContexts& contexts,
Status* s) {
Status BlobGCJob::BatchWriteNewIndices(const BlobFileBuilder::OutContexts& contexts) {
auto* cfh = blob_gc_->column_family_handle();
for (const std::unique_ptr<BlobFileBuilder::BlobRecordContext>& ctx :
contexts) {
MergeBlobIndex merge_blob_index;
merge_blob_index.file_number = ctx->new_blob_index.file_number;
merge_blob_index.source_file_number = ctx->original_blob_index.file_number;
merge_blob_index.source_file_offset =
ctx->original_blob_index.blob_handle.offset;
merge_blob_index.blob_handle = ctx->new_blob_index.blob_handle;

Status s;
for (const auto& ctx : contexts) {
std::string index_entry;
BlobIndex original_index = ctx->original_blob_index;
ParsedInternalKey ikey;
if (!ParseInternalKey(ctx->key, &ikey)) {
*s = Status::Corruption(Slice());
return;
return Status::Corruption(Slice());;
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add a meaning error message

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Ok, I'll add one

}
if (!gc_merge_rewrite_) {
merge_blob_index.EncodeToBase(&index_entry);
const BlobIndex &index = ctx->new_blob_index;
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why is it different from before?

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Because the merge blob index is only used in the second if branch. I just think we should only declare the merge blob index when we truly use it. This will help others understand the code easily.

index.EncodeTo(&index_entry);
// Store WriteBatch for rewriting new Key-Index pairs to LSM
GarbageCollectionWriteCallback callback(cfh, ikey.user_key.ToString(),
std::move(original_index));
callback.value = index_entry;
rewrite_batches_.emplace_back(
std::make_pair(WriteBatch(), std::move(callback)));
auto& wb = rewrite_batches_.back().first;
*s = WriteBatchInternal::PutBlobIndex(&wb, cfh->GetID(), ikey.user_key,
s = WriteBatchInternal::PutBlobIndex(&wb, cfh->GetID(), ikey.user_key,
index_entry);
} else {
MergeBlobIndex merge_blob_index;
merge_blob_index.file_number = ctx->new_blob_index.file_number;
merge_blob_index.source_file_number =
ctx->original_blob_index.file_number;
merge_blob_index.source_file_offset =
ctx->original_blob_index.blob_handle.offset;
merge_blob_index.blob_handle = ctx->new_blob_index.blob_handle;
merge_blob_index.EncodeTo(&index_entry);
rewrite_batches_without_callback_.emplace_back(
std::make_pair(WriteBatch(), original_index.blob_handle.size));
auto& wb = rewrite_batches_without_callback_.back().first;
*s = WriteBatchInternal::Merge(&wb, cfh->GetID(), ikey.user_key,
s = WriteBatchInternal::Merge(&wb, cfh->GetID(), ikey.user_key,
index_entry);
}
if (!s->ok()) break;
if (!s.ok()) break;
}
return s;
}

Status BlobGCJob::BuildIterator(
Expand Down Expand Up @@ -415,7 +415,10 @@ Status BlobGCJob::InstallOutputBlobFiles() {
for (auto& builder : blob_file_builders_) {
BlobFileBuilder::OutContexts contexts;
s = builder.second->Finish(&contexts);
BatchWriteNewIndices(contexts, &s);
if (!s.ok()) {
break;
}
s = BatchWriteNewIndices(contexts);
if (!s.ok()) {
break;
}
Expand Down
2 changes: 1 addition & 1 deletion src/blob_gc_job.h
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Original file line number Diff line number Diff line change
Expand Up @@ -90,7 +90,7 @@ class BlobGCJob {
uint64_t io_bytes_written_ = 0;

Status DoRunGC();
void BatchWriteNewIndices(BlobFileBuilder::OutContexts &contexts, Status *s);
Status BatchWriteNewIndices(const BlobFileBuilder::OutContexts& contexts);
Status BuildIterator(std::unique_ptr<BlobFileMergeIterator> *result);
Status DiscardEntry(const Slice &key, const BlobIndex &blob_index,
bool *discardable);
Expand Down