When I run a mapping on the Blaze engine and try to view the grid task log, the Blaze Job Monitor does not fetch the full log.
The grid task log might be too large. The Blaze Job Monitor can only fetch up to 2 MB of an aggregated log. The first line of the log reports this information and provides the location of the full log on HDFS. Follow the link to HDFS and search for "aggregated logs for grid mapping." The link to the full log contains the grid task number.
The Monitoring URL is not displayed in the Properties view of the Administrator tool.
Locate the URL in the YARN log.
When the connection to the Application Timeline Server is lost, the Blaze engine continues to attempt to reconnect to it.
Restart the Application Timeline Server from the cluster management interface.