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Expose the table properties to application

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Summary: Provide a public API for users to access the table properties for each SSTable.

Test Plan: Added a unit tests to test the function correctness under differnet conditions.

Reviewers: haobo, dhruba, sdong

Reviewed By: haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D16083
This commit is contained in:
kailiu
2014-02-13 16:28:21 -08:00
parent b2e7ee8b41
commit 63690625cd
12 changed files with 272 additions and 65 deletions
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55
db/version_set.cc
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@@ -25,6 +25,8 @@
#include "table/table_reader.h"
#include "table/merger.h"
#include "table/two_level_iterator.h"
#include "table/format.h"
#include "table/meta_blocks.h"
#include "util/coding.h"
#include "util/logging.h"
#include "util/stop_watch.h"
@@ -238,6 +240,59 @@ bool Version::PrefixMayMatch(const ReadOptions& options,
return may_match;
}
Status Version::GetPropertiesOfAllTables(TablePropertiesCollection* props) {
auto table_cache = vset_->table_cache_;
auto options = vset_->options_;
for (int level = 0; level < num_levels_; level++) {
for (const auto& file_meta : files_[level]) {
auto fname = TableFileName(vset_->dbname_, file_meta->number);
// 1. If the table is already present in table cache, load table
// properties from there.
std::shared_ptr<const TableProperties> table_properties;
Status s = table_cache->GetTableProperties(
vset_->storage_options_, vset_->icmp_, *file_meta, &table_properties,
true /* no io */);
if (s.ok()) {
props->insert({fname, table_properties});
continue;
}
// We only ignore error type `Incomplete` since it's by design that we
// disallow table when it's not in table cache.
if (!s.IsIncomplete()) {
return s;
}
// 2. Table is not present in table cache, we'll read the table properties
// directly from the properties block in the file.
std::unique_ptr<RandomAccessFile> file;
s = vset_->env_->NewRandomAccessFile(fname, &file,
vset_->storage_options_);
if (!s.ok()) {
return s;
}
TableProperties* raw_table_properties;
// By setting the magic number to kInvalidTableMagicNumber, we can by
// pass the magic number check in the footer.
s = ReadTableProperties(
file.get(), file_meta->file_size,
Footer::kInvalidTableMagicNumber /* table's magic number */,
vset_->env_, options->info_log.get(), &raw_table_properties);
if (!s.ok()) {
return s;
}
RecordTick(options->statistics.get(),
NUMBER_DIRECT_LOAD_TABLE_PROPERTIES);
props->insert({fname, std::shared_ptr<const TableProperties>(
raw_table_properties)});
}
}
return Status::OK();
}
Iterator* Version::NewConcatenatingIterator(const ReadOptions& options,
const EnvOptions& soptions,
int level) const {