Access Hadoop Error Logs: Quick Guide

To view the error logs of Hadoop, you can follow these steps:

1. Open the terminal of a node in the Hadoop cluster (typically the master node or NameNode node).
2. log directory for Hadoop
3. hadoop-[username]-namenode-[hostname].log: Error logs for the NameNode.
4. hadoop-[username]-datanode-[hostname].log: Error log for DataNode.
5. Error logs for the SecondaryNameNode are found in hadoop-[username]-secondarynamenode-[hostname].log.
6. hadoop-[username]-jobtracker-[hostname].log: Error logs for the JobTracker.
7. hadoop-[username]-tasktracker-[hostname].log: Error logs for the TaskTracker.
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11. Search for all ERROR level error messages in the NameNode log hadoop-[username]-namenode-[hostname].log.
12. Search for all error messages in the DataNode log file that include the keyword “Exception” using grep on hadoop-[username]-datanode-[hostname].log.

Please note that the above paths and file names may vary depending on the Hadoop version, installation method, and configuration. Please adjust accordingly to your specific situation.