MarkLogic 9 Product Documentation

MarkLogic Connector for Hadoop Developer's Guide — Chapter 6

Enabling Debug Level Logging

Enable debug logging for more insight into the job processing. For example, with debug logging enabled, the MarkLogic Connector for Hadoop logs detailed information about input splits, including the split query. To enable debug logging:

1. Edit $HADOOP_CONF_DIR/log4j.properties.
2. Add the following line to enable debug logging:

   log4j.logger.com.marklogic.mapreduce=DEBUG

3. Re-run the job and look for DEBUG messages in the console output or log files.

In standalone mode, job output goes to stdout and stderr. In pseudo-distributed or fully distributed mode, job output goes to stdout, stderr, and Hadoop log files. For information on locating log files, see Viewing Job Status and Logs.

Solutions to Common Problems

This section presents symptoms and possible solutions for the following common problems:

• Configuration File Not Found
• XDBC App Server Not Reachable
• Authorization Failure

For details, consult the documentation for your Hadoop distribution or the Apache Hadoop documentation at http://hadoop.apache.org.