I dont kow if you have a custom trigger or a built in trigger for health test.  Is the health test showing warning or critical or bad ?    either way the test is  to find the data locality in the host . " Make sure that Impala Daemon is co-located with a DataNode, and that the IP address of each Impala Daemon matches the IP address of its co-located DataNode"    Please make sure if  you have enabled the below properties in hdfs-site.xml     <property> <name>dfs.client.read.shortcircuit</name> <value>true</value> </property> <property> <name>dfs.domain.socket.path</name> <value>/var/run/hdfs-sockets/dn</value> </property> <property> <name>dfs.client.file-block-storage-locations.timeout.millis</name> <value>10000</value> </property> Reference  https://www.cloudera.com/documentation/enterprise/5-9-x/topics/impala_config_performance.html#config_performance ... View more