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Ratis Tools

The ratis-tools module contains a collection of command-line tools for working with Ratis.

Log Dump Tool​

The DefaultLogDump tool provides a simple way to dump the contents of a Ratis log segment file. This can be useful for debugging and understanding the sequence of operations in your Ratis cluster.

Usage​

To use the log dump tool, you need to provide the path to the log segment file as a command-line argument:

java -cp <classpath> org.apache.ratis.tools.DefaultLogDump <path-to-log-segment-file>

The tool will then print the contents of the log segment file to the console, including the log entry index, term, and the state machine log entry.

Log Parsing Tool​

The ParseRatisLog tool provides a more advanced way to parse and analyze Ratis log segment files. It allows you to customize the output format and filter the log entries based on your needs.

Usage​

The ParseRatisLog tool can be used programmatically by creating an instance of the ParseRatisLog.Builder class. The builder allows you to specify the log segment file, the maximum operation size, and a custom function for converting state machine log entries to strings.

Here is an example of how to use the ParseRatisLog tool:

import org.apache.ratis.tools.ParseRatisLog;
import java.io.File;

// ...

File logFile = new File("/path/to/your/log/segment/file");
ParseRatisLog.Builder builder = new ParseRatisLog.Builder();
ParseRatisLog parser = builder.setSegmentFile(logFile).build();
parser.dumpSegmentFile();

This will dump the contents of the specified log segment file to the console, providing a detailed breakdown of the log entries.