hive return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask

The return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask typically indicates an error in the MapReduce task of a Hive query. This error can occur due to various reasons, such as:

1. Input/output data issues: This error can occur if there is a problem with the input or output data of the MapReduce task. This could be due to missing or incomplete data, incorrect file formats, or permission issues.

2. Configuration issues: This error can also occur if there is a problem with the configuration of the MapReduce task. This could be due to incorrect settings for the cluster, such as memory allocation or resource limits.

3. Code issues: This error can also occur if there is a problem with the code of the MapReduce task. This could be due to syntax errors, logic errors, or compatibility issues with the Hadoop version.

To resolve this error, you can try the following steps:

1. Check the logs: Look for the logs of the MapReduce task to identify the root cause of the error. The log files can provide valuable information about the error, such as file paths, error messages, and stack traces.

2. Check the input/output data: Verify that the input and output data of the MapReduce task are correct and complete. Check the file formats, permissions, and file paths to ensure that they are valid.

3. Check the configuration: Verify that the configuration of the MapReduce task is correct. Check the memory allocation, resource limits, and other settings to ensure that they are appropriate for the cluster.

4. Check the code: Verify that the code of the MapReduce task is correct. Check for syntax errors, logic errors, and compatibility issues with the Hadoop version.

If none of these steps resolve the error, you may need to seek assistance from a Hadoop or Hive expert.