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[Feature] Add local tablet reader and rpc interface (StarRocks#16537)
Signed-off-by: Binglin Chang <decstery@gmail.com>
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2021-present StarRocks, Inc. All rights reserved. | ||
| // | ||
| // Licensed 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 | ||
| // | ||
| // https://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 "storage/local_tablet_reader.h" | ||
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| #include "storage/chunk_helper.h" | ||
| #include "storage/primary_index.h" | ||
| #include "storage/primary_key_encoder.h" | ||
| #include "storage/projection_iterator.h" | ||
| #include "storage/tablet_reader.h" | ||
| #include "storage/tablet_updates.h" | ||
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| namespace starrocks { | ||
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| LocalTabletReader::LocalTabletReader() {} | ||
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| Status LocalTabletReader::init(TabletSharedPtr& tablet, int64_t version) { | ||
| if (tablet->updates() == nullptr) { | ||
| return Status::NotSupported("LocalTabletReader only support PK tablet"); | ||
| } | ||
| _tablet = tablet; | ||
| _version = version; | ||
| return Status::OK(); | ||
| } | ||
|
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| Status LocalTabletReader::close() { | ||
| return Status::OK(); | ||
| } | ||
|
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| static void plan_read_by_rssid(const vector<uint64_t>& rowids, vector<bool>& found, | ||
| std::map<uint32_t, std::vector<uint32_t>>& rowids_by_rssid, vector<uint32_t>& idxes) { | ||
| struct RowidSortEntry { | ||
| uint32_t rowid; | ||
| uint32_t idx; | ||
| RowidSortEntry(uint32_t rowid, uint32_t idx) : rowid(rowid), idx(idx) {} | ||
| bool operator<(const RowidSortEntry& rhs) const { return rowid < rhs.rowid; } | ||
| }; | ||
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| size_t n = rowids.size(); | ||
| found.resize(n); | ||
| phmap::node_hash_map<uint32_t, std::vector<RowidSortEntry>> sort_entry_by_rssid; | ||
| uint32_t idx = 0; | ||
| for (uint32_t i = 0; i < n; i++) { | ||
| uint64_t v = rowids[i]; | ||
| uint32_t rssid = v >> 32; | ||
| if (rssid == (uint32_t)-1) { | ||
| found[i] = false; | ||
| } else { | ||
| found[i] = true; | ||
| uint32_t rowid = v & ROWID_MASK; | ||
| sort_entry_by_rssid[rssid].emplace_back(rowid, idx++); | ||
| } | ||
| } | ||
| // construct rowids_by_rssid | ||
| for (auto& e : sort_entry_by_rssid) { | ||
| std::sort(e.second.begin(), e.second.end()); | ||
| rowids_by_rssid.emplace(e.first, std::vector<uint32_t>(e.second.size())); | ||
| } | ||
| idxes.resize(idx); | ||
| // iterate rowids_by_rssid by rssid order | ||
| uint32_t ridx = 0; | ||
| for (auto& e : rowids_by_rssid) { | ||
| auto& sort_entries = sort_entry_by_rssid[e.first]; | ||
| for (uint32_t i = 0; i < sort_entries.size(); i++) { | ||
| e.second[i] = sort_entries[i].rowid; | ||
| idxes[sort_entries[i].idx] = ridx; | ||
| ridx++; | ||
| } | ||
| } | ||
| } | ||
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| Status LocalTabletReader::multi_get(const Chunk& keys, const std::vector<std::string>& value_columns, | ||
| std::vector<bool>& found, Chunk& values) { | ||
| int64_t t_start = MonotonicMillis(); | ||
| size_t n = keys.num_rows(); | ||
| if (n > UINT32_MAX) { | ||
| return Status::InvalidArgument( | ||
| strings::Substitute("multi_get number of keys exceed limit $0 > $1", n, UINT32_MAX)); | ||
| } | ||
| // get read column ids by values_columns | ||
| const auto& tablet_schema = _tablet->tablet_schema(); | ||
| std::vector<uint32_t> read_column_ids; | ||
| for (const auto& name : value_columns) { | ||
| auto cid = tablet_schema.field_index(name); | ||
| if (cid == -1) { | ||
| return Status::InvalidArgument(strings::Substitute("multi_get value_column $0 not found", name)); | ||
| } | ||
| read_column_ids.push_back(cid); | ||
| } | ||
|
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| // convert keys to pk single column format | ||
| vector<uint32_t> pk_columns; | ||
| for (size_t i = 0; i < tablet_schema.num_key_columns(); i++) { | ||
| pk_columns.push_back((uint32_t)i); | ||
| } | ||
| std::unique_ptr<Column> pk_column; | ||
| if (!PrimaryKeyEncoder::create_column(*tablet_schema.schema(), &pk_column).ok()) { | ||
| CHECK(false) << "create column for primary key encoder failed"; | ||
| } | ||
| PrimaryKeyEncoder::encode(*tablet_schema.schema(), keys, 0, keys.num_rows(), pk_column.get()); | ||
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| // search pks in pk index to get rowids | ||
| EditVersion edit_version; | ||
| std::vector<uint64_t> rowids(n); | ||
| RETURN_IF_ERROR( | ||
| _tablet->updates()->prepare_partial_update_states(_tablet.get(), pk_column, &edit_version, &rowids)); | ||
| if (edit_version.major() != _version) { | ||
| return Status::InternalError( | ||
| strings::Substitute("multi_get version not match tablet:$0 current_version:$1 read_version:$2", | ||
| _tablet->tablet_id(), edit_version.to_string(), _version)); | ||
| } | ||
| if (rowids.size() != n) { | ||
| return Status::InternalError(strings::Substitute("multi_get rowid size not match tablet:$0 $1 != $2", | ||
| _tablet->tablet_id(), rowids.size(), n)); | ||
| } | ||
|
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| // sort rowids by rssid, so we can plan&perform read operations by rowset/segment | ||
| std::map<uint32_t, std::vector<uint32_t>> rowids_by_rssid; | ||
| vector<uint32_t> idxes; | ||
| plan_read_by_rssid(rowids, found, rowids_by_rssid, idxes); | ||
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| auto read_column_schema = ChunkHelper::convert_schema(tablet_schema, read_column_ids); | ||
| std::vector<std::unique_ptr<Column>> read_columns(read_column_ids.size()); | ||
| for (uint32_t i = 0; i < read_columns.size(); ++i) { | ||
| read_columns[i] = ChunkHelper::column_from_field(*read_column_schema.field(i).get())->clone_empty(); | ||
| } | ||
| RETURN_IF_ERROR(_tablet->updates()->get_column_values(read_column_ids, false, rowids_by_rssid, &read_columns)); | ||
|
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| // reorder read values to input keys' order and put into values output parameter | ||
| values.reset(); | ||
| for (size_t col_idx = 0; col_idx < read_column_ids.size(); col_idx++) { | ||
| values.get_column_by_index(col_idx)->append_selective(*read_columns[col_idx], idxes.data(), 0, idxes.size()); | ||
| } | ||
| int64_t t_end = MonotonicMillis(); | ||
| LOG(INFO) << strings::Substitute("multi_get tablet:$0 version:$1 #columns:$2 #rows:$3 found:$4 time:$5ms", | ||
| _tablet->tablet_id(), _version, value_columns.size(), n, idxes.size(), | ||
| t_end - t_start); | ||
| return Status::OK(); | ||
| } | ||
|
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| StatusOr<ChunkIteratorPtr> LocalTabletReader::scan(const std::vector<std::string>& value_columns, | ||
| const std::vector<const ColumnPredicate*>& predicates) { | ||
| TabletReaderParams tablet_reader_params; | ||
| tablet_reader_params.predicates = predicates; | ||
| auto& full_schema = *_tablet->tablet_schema().schema(); | ||
| vector<ColumnId> column_ids; | ||
| for (auto& cname : value_columns) { | ||
| auto idx = full_schema.get_field_index_by_name(cname); | ||
| if (idx == -1) { | ||
| return Status::InvalidArgument(strings::Substitute("column $0 not found", cname)); | ||
| } | ||
| column_ids.push_back(idx); | ||
| } | ||
| auto values_schema = Schema(&full_schema, column_ids); | ||
| std::shared_ptr<TabletReader> reader = std::make_shared<TabletReader>(_tablet, Version(0, _version), full_schema); | ||
| RETURN_IF_ERROR(reader->prepare()); | ||
| RETURN_IF_ERROR(reader->open(tablet_reader_params)); | ||
| // TODO: remove projection | ||
| return new_projection_iterator(values_schema, reader); | ||
| } | ||
|
|
||
| } // namespace starrocks |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| // Copyright 2021-present StarRocks, Inc. All rights reserved. | ||
| // | ||
| // Licensed 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 | ||
| // | ||
| // https://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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| #pragma once | ||
|
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| #include "storage/chunk_iterator.h" | ||
| #include "storage/tablet.h" | ||
|
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| namespace starrocks { | ||
|
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| class ColumnPredicate; | ||
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| // A tablet reader supports multiple get and scan snapshot reads | ||
| // this class is used for remote accessible TableReader, do not confuse with TabletReader | ||
| class LocalTabletReader { | ||
| public: | ||
| LocalTabletReader(); | ||
|
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| Status init(TabletSharedPtr& tablet, int64_t version); | ||
|
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| Status close(); | ||
|
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| // for detail document, see TableReader::scan | ||
| Status multi_get(const Chunk& keys, const std::vector<std::string>& value_columns, std::vector<bool>& found, | ||
| Chunk& values); | ||
|
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| // for detail document, see TableReader::scan | ||
| StatusOr<ChunkIteratorPtr> scan(const std::vector<std::string>& value_columns, | ||
| const std::vector<const ColumnPredicate*>& predicates); | ||
|
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| private: | ||
| TabletSharedPtr _tablet; | ||
| int64_t _version{0}; | ||
| }; | ||
|
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| // Manage remotely opened LocalTabletReaders | ||
| class LocalTabletReaderManager { | ||
| public: | ||
| LocalTabletReaderManager(); | ||
| }; | ||
|
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| } // namespace starrocks |
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