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Remove unnecessary status check in TableCache::NewIterator

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Summary:
While investigating the usage of `new_table_iterator_nanos` perf counter, I saw some code was wrapper around with unnecessary status check ... so removed it.
Closes https://github.com/facebook/rocksdb/pull/3120

Differential Revision: D6229181

Pulled By: sagar0

fbshipit-source-id: f8a44fe67f5a05df94553fdb233b21e54e88cc34
This commit is contained in:
Sagar Vemuri 2017-11-03 14:34:10 -07:00 committed by Facebook Github Bot
parent 4c8f336401
commit a6d8e30c05
1 changed files with 33 additions and 35 deletions
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68
db/table_cache.cc
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@ -180,46 +180,44 @@ InternalIterator* TableCache::NewIterator(
bool create_new_table_reader = false;
TableReader* table_reader = nullptr;
Cache::Handle* handle = nullptr;
if (s.ok()) {
if (table_reader_ptr != nullptr) {
*table_reader_ptr = nullptr;
}
size_t readahead = 0;
if (for_compaction) {
if (table_reader_ptr != nullptr) {
*table_reader_ptr = nullptr;
}
size_t readahead = 0;
if (for_compaction) {
#ifndef NDEBUG
bool use_direct_reads_for_compaction = env_options.use_direct_reads;
TEST_SYNC_POINT_CALLBACK("TableCache::NewIterator:for_compaction",
&use_direct_reads_for_compaction);
bool use_direct_reads_for_compaction = env_options.use_direct_reads;
TEST_SYNC_POINT_CALLBACK("TableCache::NewIterator:for_compaction",
&use_direct_reads_for_compaction);
#endif // !NDEBUG
if (ioptions_.new_table_reader_for_compaction_inputs) {
readahead = ioptions_.compaction_readahead_size;
create_new_table_reader = true;
}
} else {
readahead = options.readahead_size;
create_new_table_reader = readahead > 0;
if (ioptions_.new_table_reader_for_compaction_inputs) {
readahead = ioptions_.compaction_readahead_size;
create_new_table_reader = true;
}
} else {
readahead = options.readahead_size;
create_new_table_reader = readahead > 0;
}
if (create_new_table_reader) {
unique_ptr<TableReader> table_reader_unique_ptr;
s = GetTableReader(
env_options, icomparator, fd, true /* sequential_mode */, readahead,
!for_compaction /* record stats */, nullptr, &table_reader_unique_ptr,
false /* skip_filters */, level,
true /* prefetch_index_and_filter_in_cache */, for_compaction);
if (create_new_table_reader) {
unique_ptr<TableReader> table_reader_unique_ptr;
s = GetTableReader(
env_options, icomparator, fd, true /* sequential_mode */, readahead,
!for_compaction /* record stats */, nullptr, &table_reader_unique_ptr,
false /* skip_filters */, level,
true /* prefetch_index_and_filter_in_cache */, for_compaction);
if (s.ok()) {
table_reader = table_reader_unique_ptr.release();
}
} else {
table_reader = fd.table_reader;
if (table_reader == nullptr) {
s = FindTable(env_options, icomparator, fd, &handle,
options.read_tier == kBlockCacheTier /* no_io */,
!for_compaction /* record read_stats */, file_read_hist,
skip_filters, level);
if (s.ok()) {
table_reader = table_reader_unique_ptr.release();
}
} else {
table_reader = fd.table_reader;
if (table_reader == nullptr) {
s = FindTable(env_options, icomparator, fd, &handle,
options.read_tier == kBlockCacheTier /* no_io */,
!for_compaction /* record read_stats */, file_read_hist,
skip_filters, level);
if (s.ok()) {
table_reader = GetTableReaderFromHandle(handle);
}
table_reader = GetTableReaderFromHandle(handle);
}
}
}