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[opt](split) get file splits in batch mode (apache#34032)
When scanning a table with many files, It will take a lot of time to transfer splits to backends.(20s of the following 1209172 splits). Therefore, using batch mode to fetch the file splits, BE can do scanning while fetch the file splits.
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| Original file line number | Diff line number | Diff line change |
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| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF licenses this file | ||
| // to you under the Apache License, Version 2.0 (the | ||
| // "License"); you may not use this file except in compliance | ||
| // with the License. You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
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| #include "vec/exec/scan/split_source_connector.h" | ||
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| #include "runtime/exec_env.h" | ||
| #include "runtime/query_context.h" | ||
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| namespace doris::vectorized { | ||
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| using apache::thrift::transport::TTransportException; | ||
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| Status LocalSplitSourceConnector::get_next(bool* has_next, TFileRangeDesc* range) { | ||
| std::lock_guard<std::mutex> l(_range_lock); | ||
| *has_next = false; | ||
| if (_scan_index < _scan_ranges.size()) { | ||
| auto& ranges = _scan_ranges[_scan_index].scan_range.ext_scan_range.file_scan_range.ranges; | ||
| if (_range_index < ranges.size()) { | ||
| *has_next = true; | ||
| *range = ranges[_range_index++]; | ||
| if (_range_index == ranges.size()) { | ||
| _scan_index++; | ||
| _range_index = 0; | ||
| } | ||
| } | ||
| } | ||
| return Status::OK(); | ||
| } | ||
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| Status RemoteSplitSourceConnector::get_next(bool* has_next, TFileRangeDesc* range) { | ||
| std::lock_guard<std::mutex> l(_range_lock); | ||
| *has_next = false; | ||
| if (_scan_index == _scan_ranges.size() && !_last_batch) { | ||
| Status coord_status; | ||
| FrontendServiceConnection coord(_state->exec_env()->frontend_client_cache(), | ||
| _state->get_query_ctx()->coord_addr, &coord_status); | ||
| RETURN_IF_ERROR(coord_status); | ||
| TFetchSplitBatchRequest request; | ||
| request.__set_split_source_id(_split_source_id); | ||
| request.__set_max_num_splits(config::remote_split_source_batch_size); | ||
| TFetchSplitBatchResult result; | ||
| try { | ||
| coord->fetchSplitBatch(result, request); | ||
| } catch (std::exception& e1) { | ||
| LOG(WARNING) << "Failed to get batch of split source: {}, try to reopen" << e1.what(); | ||
| RETURN_IF_ERROR(coord.reopen()); | ||
| try { | ||
| coord->fetchSplitBatch(result, request); | ||
| } catch (std::exception& e2) { | ||
| return Status::IOError("Failed to get batch of split source: {}", e2.what()); | ||
| } | ||
| } | ||
| _last_batch = result.splits.empty(); | ||
| _scan_ranges = result.splits; | ||
| _scan_index = 0; | ||
| _range_index = 0; | ||
| } | ||
| if (_scan_index < _scan_ranges.size()) { | ||
| auto& ranges = _scan_ranges[_scan_index].scan_range.ext_scan_range.file_scan_range.ranges; | ||
| if (_range_index < ranges.size()) { | ||
| *has_next = true; | ||
| *range = ranges[_range_index++]; | ||
| if (_range_index == ranges.size()) { | ||
| _scan_index++; | ||
| _range_index = 0; | ||
| } | ||
| } | ||
| } | ||
| return Status::OK(); | ||
| } | ||
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| } // namespace doris::vectorized |
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