You can configure the Data Integration Service to log details about the mapping execution to the session log. To enable logging of LDTM mapping execution details, set the log tracing level to verbose initialization or verbose data. Mapping execution details include the following information:

The Blaze engine stores tasklet and Blaze component log events in temporary and permanent directories on the Hadoop cluster. The log file directories are specified by properties in the hadoopEnv.properties file located in the following location for each Hadoop distribution:

<Informatica Installation directory>/services/shared/hadoop/<distribution directory>/infaConf

The temporary directory is specified by the following property in the hadoopEnv.properties file:

infagrid.node.local.root.log.dir

. An administrator must create a directory with read, write, and execute permissions on all nodes on the Hadoop cluster.

For example, configure the following path for the property:

infagrid.node.local.root.log.dir=$HADOOP_NODE_INFA_HOME/dtmLogs

After the mapping completes, the Data Integration Service moves the tasklet log events from the temporary directory to a permanent directory on HDFS. The permanent directory is specified by the following property in the hadoopEnv.properties file:

infacal.hadoop.logs.directory

.

For example, configure the following path for the property:

infacal.hadoop.logs.directory=/var/log/hadoop-yarn/apps/informatica

If you want to retain the tasklet logs in the temporary directory, set the value of the following property in the hadoopEnv.properties file to false:

infagrid.delete.local.log

If you do not configure the temporary or permanent directories, the tasklet log events appear in the directory configured for the DTM Process. You can get the directory for the DTM Process from the value for the

yarn.nodemanager.local-dirs

property in yarn-site.xml on the cluster node.

The following sample code describes the

yarn.nodemanager.local-dirs

property:

<property>
<name>yarn.nodemanager.local-dirs</name>
<value>/var/lib/hadoop-yarn/cache/${user.name}/nm-local-dir</value>
<description>List of directories to store local files.</description>
</property>