hongzhi-gao commented on code in PR #731:
URL: https://github.com/apache/tsfile/pull/731#discussion_r2876634320
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cpp/src/writer/tsfile_writer.cc:
##########
@@ -113,11 +115,50 @@ int TsFileWriter::init(WriteFile* write_file) {
}
write_file_ = write_file;
write_file_created_ = false;
+ io_writer_owned_ = true;
io_writer_ = new TsFileIOWriter();
io_writer_->init(write_file_);
return E_OK;
}
+int TsFileWriter::init(RestorableTsFileIOWriter* rw) {
+ // Initialize from a recovered writer: take schema from file, do not own
+ // io_writer_
+ if (rw == nullptr) {
+ return E_INVALID_ARG;
+ }
+ if (!rw->can_write()) {
+ return E_INVALID_ARG;
+ }
+ write_file_ = rw->get_write_file();
+ write_file_created_ = false;
+ io_writer_owned_ = false;
+ io_writer_ = rw; // RestorableTsFileIOWriter is also a TsFileIOWriter
+ std::shared_ptr<Schema> known = rw->get_known_schema();
+ for (const auto& kv : known->table_schema_map_) {
+ const std::string& table_name = kv.first;
+ const std::shared_ptr<TableSchema>& ts = kv.second;
+ if (!ts || ts->get_measurement_names().empty()) {
+ continue;
+ }
+ auto device_id = std::make_shared<StringArrayDeviceID>(table_name);
+ auto* ms_group = new MeasurementSchemaGroup;
Review Comment:
We rebuild mutable in-memory schema cache from recovered schema; table_name
is used as device key, and ms_group supports lazy writer creation later.
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