TsFile C++ Document

Introduction

This directory contains the C++ implementation of TsFile. The C++ version currently supports the query and write functions of TsFile, including time filtering queries.

The source code can be found in the ./src directory. C/C++ examples are located in the ./examples directory, and a benchmark for TsFile_cpp can be found in the ./bench_mark directory. Additionally, a C function wrapper is available in the ./src/cwrapper directory, which the Python tool relies on.

How to make contributions

We use clang-format to ensure that our C++ code adheres to a consistent set of rules defined in ./clang-format. This is similar to the Google style.

Feature List:

• [ ] Add unit tests for the reader, writer, compression, etc.
• [ ] Add unit tests for the C wrapper.
• [ ] Support multiple data flushes.
• [ ] Support aligned timeseries.
• [ ] Support table description in tsfile.
• [ ] Retrieve all table schemas/names.
• [ ] Implement automatic flush.
• [ ] Support out-of-order data writing.
• [ ] Support TsFile V4. Note: TsFile CPP does not implement support for the table model, therefore there are differences in file output compared to the Java version.

Bug List:

• [ ] Flushing without writing after registering a timeseries will cause a core dump.
• [ ] Misalignment in memory may lead to a bus error.

We welcome any bug reports. You can open an issue with a title starting with [CPP] to describe the bug, like: https://github.com/apache/tsfile/issues/94

Build

Requirements

sudo apt-get update
sudo apt-get install -y cmake make g++ clang-format

To build tsfile, you can run: bash build.sh. If you have Maven tools, you can run: mvn package -P with-cpp clean verify. Then, you can find the shared object at ./build.

Before you submit your code to GitHub, please ensure that the mvn compilation is correct.

If you compile using MinGW on windows and encounter an error, you can try replacing MinGW with the following version that we have tried without problems:

• GCC 14.2.0 (with POSIX threads) + LLVM/Clang/LLD/LLDB 18.1.8 + MinGW-w64 12.0.0 UCRT - release 1
• GCC 12.2.0 + LLVM/Clang/LLD/LLDB 16.0.0 + MinGW-w64 10.0.0 (UCRT) - release 5
• GCC 12.2.0 + LLVM/Clang/LLD/LLDB 16.0.0 + MinGW-w64 10.0.0 (MSVCRT) - release 5
• GCC 11.2.0 + MinGW-w64 10.0.0 (MSVCRT) - release 1

Use TsFile

You can find examples on how to read and write data in demo_read.cpp and demo_write.cpp located under ./examples/cpp_examples. There are also examples under ./examples/c_exampleson how to use a C-style API to read and write data in a C environment. You can run bash build.sh under ./examples to generate an executable output under ./examples/build.