Impala Health Checks

Impala Assignment Locality

This is an Impala service-level health check that checks that a sufficient percentage of recent assignments are operating on local data. The check returns "Concerning" or "Bad" health if the number of assignments operating on local data falls below a warning or critical thresholds. The number of assignments observed during the check's window must be above a configured minimum number of assignments for the check to be enabled. A failure of this health check may indicate problems with the configuration of the Impala service. Check that each 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. This test can be configured using the Assignment Locality Ratio Thresholds, Assignment Locality Monitoring Period and Assignment Locality Minimum Assignments Impala service-wide monitoring settings.

Short Name: Assignment Locality

Property Name Description Template Name Default Value Unit
Assignment Locality Minimum Assignments The minimum number of assignments that must occur during the test time period before the threshold values will be checked. Until this number of assignments have been observed in the test time period the health check will be disabled. impala_assignment_locality_minimum 10 no unit
Assignment Locality Monitoring Period The time period over which to compute the assignment locality ratio. Specified in minutes. impala_assignment_locality_window 15 MINUTES
Assignment Locality Ratio Thresholds The health check thresholds for assignment locality. Specified as a percentage of total assignments. impala_assignment_locality_thresholds critical:5.000000, warning:80.000000 PERCENT

Impala Daemons Health

This is an Impala service-level health check that checks that enough of the Impala Daemons in the cluster are healthy. The check returns "Concerning" health if the number of healthy Impala Daemons falls below a warning threshold, expressed as a percentage of the total number of Impala Daemons. The check returns "Bad" health if the number of healthy and "Concerning" Impala Daemons falls below a critical threshold, expressed as a percentage of the total number of Impala Daemons. For example, if this check is configured with a warning threshold of 95% and a critical threshold of 90% for a cluster of 100 Impala Daemons, this check would return "Good" health if 95 or more Impala Daemons have good health. This check would return "Concerning" health if at least 90 Impala Daemons have either "Good" or "Concerning" health. If more than 10 Impala Daemons have bad health, this check would return "Bad" health. A failure of this health check indicates unhealthy Impala Daemons. Check the status of the individual Impala Daemons for more information. This test can be configured using the Healthy Impala Daemon Monitoring Thresholds Impala service-wide monitoring setting.

Short Name: Impala Daemons Health

Property Name Description Template Name Default Value Unit
Healthy Impala Daemon Monitoring Thresholds The health check thresholds of the overall Impala Daemons health. The check returns "Concerning" health if the percentage of "Healthy" Impala Daemons falls below the warning threshold. The check is unhealthy if the total percentage of "Healthy" and "Concerning" Impala Daemons falls below the critical threshold. impala_impalads_healthy_thresholds critical:90.000000, warning:95.000000 PERCENT

Impala StateStore Health

This Impala service-level health check checks for the presence of a running, healthy Impala StateStore Daemon. The check returns "Bad" health if the service is running and the Impala StateStore Daemon is not running. In all other cases it returns the health of the Impala StateStore Daemon. A failure of this health check indicates a stopped or unhealthy Impala StateStore Daemon. Check the status of the Impala StateStore Daemon for more information. This test can be enabled or disabled using the StateStore Role Health Check Impala StateStore Daemon service-wide monitoring setting.

Short Name: StateStore Health

Property Name Description Template Name Default Value Unit
StateStore Role Health Check When computing the overall Impala cluster health, consider the StateStore's health impala_statestore_health_enabled true no unit