Impala Daemon Metrics
In addition to these base metrics, many aggregate metrics are available. If an entity type has parents defined, you can formulate all possible aggregate metrics using the formula base_metric_across_parents.
In addition, metrics for aggregate totals can be formed by adding the prefix total_ to the front of the metric name.
Use the type-ahead feature in the Cloudera Manager chart browser to find the exact aggregate metric name, in case the plural form does not end in "s".
For example, the following metric names may be valid for Impala Daemon:
- alerts_rate_across_clusters
- total_alerts_rate_across_clusters
Some metrics, such as alerts_rate, apply to nearly every metric context. Others only apply to a certain service or role.
For more information about metrics, see Cloudera Manager Metrics and Metric Aggregation.
| Metric Name | Description | Unit | Parents | CDH Version |
|---|---|---|---|---|
| alerts_rate | The number of alerts. | events per second | cluster, impala, rack | CDH 4, CDH 5 |
| assignments_rate | The number of assignments | assignments per second | cluster, impala, rack | CDH 4, CDH 5 |
| audit_agent_bytes_left_rate | Number of bytes of audit events still to be sent to the Audit Server. | bytes per second | cluster, impala, rack | CDH 4, CDH 5 |
| audit_agent_bytes_sent_rate | Number of bytes of audit events successfully sent by Cloudera Manager Agent to the Audit Server. | bytes per second | cluster, impala, rack | CDH 4, CDH 5 |
| audit_agent_events_sent_rate | Number of audit events successfully sent by Cloudera Manager Agent to the Audit Server. | events per second | cluster, impala, rack | CDH 4, CDH 5 |
| audit_agent_send_failures_rate | Number of time Cloudera Manager Agent encountered failure when sending audit event(s) to the Audit Server. | errors per second | cluster, impala, rack | CDH 4, CDH 5 |
| audit_plugin_coalesced_rate | Number of audit events coalesced | events per second | cluster, impala, rack | CDH 4, CDH 5 |
| audit_plugin_events_rate | Number of audit events persisted to local filesystem | events per second | cluster, impala, rack | CDH 4, CDH 5 |
| audit_plugin_exceptions_rate | Number of exception encountered when processing audit events | errors per second | cluster, impala, rack | CDH 4, CDH 5 |
| audit_plugin_filtered_rate | Number of audit events that were filtered based on user specified criteria | events per second | cluster, impala, rack | CDH 4, CDH 5 |
| audit_plugin_parse_errors_rate | Number of audit events that cannot be parsed | errors per second | cluster, impala, rack | CDH 4, CDH 5 |
| backends_client_cache_clients_in_use | The number of active Impala Backend clients. These clients are for communication with other Impala Daemons. | clients | cluster, impala, rack | CDH 4, CDH 5 |
| backends_client_cache_total_clients | The total number of Impala Backend clients in this Impala Daemon's client cache. These clients are for communication with other Impala Daemons. | clients | cluster, impala, rack | CDH 4, CDH 5 |
| catalog_num_databases | The number of databases in the catalog. | databases | cluster, impala, rack | CDH 4, CDH 5 |
| catalog_num_tables | The number of tables in the catalog. | table | cluster, impala, rack | CDH 4, CDH 5 |
| cgroup_cpu_system_rate | CPU usage of the role's cgroup | seconds per second | cluster, impala, rack | CDH 4, CDH 5 |
| cgroup_cpu_user_rate | User Space CPU usage of the role's cgroup | seconds per second | cluster, impala, rack | CDH 4, CDH 5 |
| cgroup_mem_page_cache | Page cache usage of the role's cgroup | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| cgroup_mem_rss | Resident memory of the role's cgroup | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| cgroup_mem_swap | Swap usage of the role's cgroup | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| cgroup_read_bytes_rate | Bytes read from all disks by the role's cgroup | bytes per second | cluster, impala, rack | CDH 4, CDH 5 |
| cgroup_read_ios_rate | Number of read I/O operations from all disks by the role's cgroup | ios per second | cluster, impala, rack | CDH 4, CDH 5 |
| cgroup_write_bytes_rate | Bytes written to all disks by the role's cgroup | bytes per second | cluster, impala, rack | CDH 4, CDH 5 |
| cgroup_write_ios_rate | Number of write I/O operations to all disks by the role's cgroup | ios per second | cluster, impala, rack | CDH 4, CDH 5 |
| cpu_system_rate | Total System CPU | seconds per second | cluster, impala, rack | CDH 4, CDH 5 |
| cpu_user_rate | Total CPU user time | seconds per second | cluster, impala, rack | CDH 4, CDH 5 |
| events_critical_rate | The number of critical events. | events per second | cluster, impala, rack | CDH 4, CDH 5 |
| events_important_rate | The number of important events. | events per second | cluster, impala, rack | CDH 4, CDH 5 |
| events_informational_rate | The number of informational events. | events per second | cluster, impala, rack | CDH 4, CDH 5 |
| fd_max | Maximum number of file descriptors | file descriptors | cluster, impala, rack | CDH 4, CDH 5 |
| fd_open | Open file descriptors. | file descriptors | cluster, impala, rack | CDH 4, CDH 5 |
| hash_table_total_bytes | The current size of all allocated hash tables. | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| health_bad_rate | Percentage of Time with Bad Health | seconds per second | cluster, impala, rack | CDH 4, CDH 5 |
| health_concerning_rate | Percentage of Time with Concerning Health | seconds per second | cluster, impala, rack | CDH 4, CDH 5 |
| health_disabled_rate | Percentage of Time with Disabled Health | seconds per second | cluster, impala, rack | CDH 4, CDH 5 |
| health_good_rate | Percentage of Time with Good Health | seconds per second | cluster, impala, rack | CDH 4, CDH 5 |
| health_unknown_rate | Percentage of Time with Unknown Health | seconds per second | cluster, impala, rack | CDH 4, CDH 5 |
| io_mgr_num_buffers | The number of allocated IO buffers. IO buffers are shared by all queries. | buffers | cluster, impala, rack | CDH 4, CDH 5 |
| io_mgr_num_open_files | The current number of files opened by the IO Manager | files | cluster, impala, rack | CDH 4, CDH 5 |
| io_mgr_num_unused_buffers | The number of unused IO buffers. IO buffers are shared by all queries. | buffers | cluster, impala, rack | CDH 4, CDH 5 |
| io_mgr_total_bytes | Number of bytes used by IO buffers (used and unused). | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| local_assignments_rate | Number of assignments operating on local data | assignments per second | cluster, impala, rack | CDH 4, CDH 5 |
| mem_pool_total_bytes | The current size of the memory pool shared by all queries | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| mem_rss | Resident memory used | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| mem_swap | Amount of swap memory used by this role's process. | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| mem_tracker_process_bytes_freed_by_last_gc | The amount of memory freed by the last memory tracker garbage collection. | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| mem_tracker_process_bytes_over_limit | The amount of memory by which the process was over its memory limit the last time the memory limit was encountered. | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| mem_tracker_process_num_gcs_rate | The total number of garbage collections performed by the memory tracker over the life of the process. | garbage collections per second | cluster, impala, rack | CDH 4, CDH 5 |
| mem_virtual | Virtual memory used | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| num_backends | The number of backend connections from this Impala Daemon to other Impala Daemons. | backends | cluster, impala, rack | CDH 4, CDH 5 |
| num_files_open_for_insert | The number of HDFS files currently open for writing. | files | cluster, impala, rack | CDH 4, CDH 5 |
| num_fragments_rate | The total number of query fragments processed over the life of the process | query fragments per second | cluster, impala, rack | CDH 4, CDH 5 |
| num_open_beeswax_sessions | The number of open Beeswax sessions. | sessions | cluster, impala, rack | CDH 4, CDH 5 |
| num_open_hiveserver2_sessions | The number of open HiveServer2 sessions. | sessions | cluster, impala, rack | CDH 4, CDH 5 |
| num_queries_expired_rate | Number of queries expired due to inactivity. | queries per second | cluster, impala, rack | CDH 4, CDH 5 |
| num_queries_rate | The total number of queries processed over the life of the process | queries per second | cluster, impala, rack | CDH 4, CDH 5 |
| num_sessions_expired_rate | Number of sessions expired due to inactivity. | sessions per second | cluster, impala, rack | CDH 4, CDH 5 |
| oom_exits_rate | The number of times the role's backing process was killed due to an OutOfMemory error. This counter is only incremented if the Cloudera Manager "Kill When Out of Memory" option is enabled. | exits per second | cluster, impala, rack | CDH 4, CDH 5 |
| read_bytes_rate | The number of bytes read from the device | bytes per second | cluster, impala, rack | CDH 4, CDH 5 |
| scan_ranges_num_missing_volume_id_rate | The total number of scan ranges read over the life of the process that did not have volume metadata | scan ranges per second | cluster, impala, rack | CDH 4, CDH 5 |
| scan_ranges_rate | The total number of scan ranges read over the life of the process | scan ranges per second | cluster, impala, rack | CDH 4, CDH 5 |
| statestore_subscriber_heartbeat_interval_time_last | The most recent interval between heartbeats from this Impala Daemon to the StateStore. | seconds | CDH 4, CDH 5 | |
| statestore_subscriber_heartbeat_interval_time_max | The maximum interval between heartbeats from this Impala Daemon to the StateStore. This is calculated over the lifetime of the Impala Daemon. | seconds | CDH 4, CDH 5 | |
| statestore_subscriber_heartbeat_interval_time_mean | The average interval between heartbeats from this Impala Daemon to the StateStore. This is calculated over the lifetime of the Impala Daemon. | seconds | CDH 4, CDH 5 | |
| statestore_subscriber_heartbeat_interval_time_min | The minimum interval between heartbeats from this Impala Daemon to the StateStore. This is calculated over the lifetime of the Impala Daemon. | seconds | CDH 4, CDH 5 | |
| statestore_subscriber_heartbeat_interval_time_rate | The total number of samples taken of the Impala Daemon's StateStore heartbeat interval. | samples per second | CDH 4, CDH 5 | |
| statestore_subscriber_heartbeat_interval_time_stddev | The standard deviation in the interval between heartbeats from this Impala Daemon to the StateStore. This is calculated over the lifetime of the Impala Daemon. | seconds | CDH 4, CDH 5 | |
| statestore_subscriber_last_recovery_duration | The amount of time the StateStore subscriber took to recover the connection the last time it was lost. | seconds | cluster, impala, rack | CDH 4, CDH 5 |
| statestore_subscriber_statestore_client_cache_clients_in_use | The number of active StateStore subscriber clients in this Impala Daemon's client cache. These clients are for communication from this role to the StateStore. | connections | cluster, impala, rack | CDH 4, CDH 5 |
| statestore_subscriber_statestore_client_cache_total_clients | The total number of StateStore subscriber clients in this Impala Daemon's client cache. These clients are for communication from this role to the StateStore. | connections | cluster, impala, rack | CDH 4, CDH 5 |
| tcmalloc_bytes_in_use | Number of bytes used by the application. This will not typically match the memory use reported by the OS, because it does not include TCMalloc overhead or memory fragmentation. | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| tcmalloc_pageheap_free_bytes | Number of bytes in free, mapped pages in page heap. These bytes can be used to fulfill allocation requests. They always count towards virtual memory usage, and unless the underlying memory is swapped out by the OS, they also count towards physical memory usage. | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| tcmalloc_pageheap_unmapped_bytes | Number of bytes in free, unmapped pages in page heap. These are bytes that have been released back to the OS, possibly by one of the MallocExtension "Release" calls. They can be used to fulfill allocation requests, but typically incur a page fault. They always count towards virtual memory usage, and depending on the OS, typically do not count towards physical memory usage. | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| tcmalloc_physical_bytes_reserved | Derived metric computing the amount of physical memory (in bytes) used by the process, including that actually in use and free bytes reserved by tcmalloc. Does not include the tcmalloc metadata. | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| tcmalloc_total_bytes_reserved | Bytes of system memory reserved by TCMalloc. | bytes | cluster, impala, rack | CDH 4, CDH 5 |
| thread_manager_running_threads | The number of running threads in this process. | threads | cluster, impala, rack | CDH 4, CDH 5 |
| thread_manager_threads_created_rate | Threads created over the lifetime of the process. | threads per second | cluster, impala, rack | CDH 4, CDH 5 |
| thrift_server_backend_connections_in_use | The number of active Impala Backend client connections to this Impala Daemon. | connections | cluster, impala, rack | CDH 4, CDH 5 |
| thrift_server_backend_connections_rate | The total number of Impala Backend client connections made to this Impala Daemon over its lifetime. | connections per second | cluster, impala, rack | CDH 4, CDH 5 |
| thrift_server_beeswax_frontend_connections_in_use | The number of active Beeswax API connections to this Impala Daemon. | connections | cluster, impala, rack | CDH 4, CDH 5 |
| thrift_server_beeswax_frontend_connections_rate | The total number of Beeswax API connections made to this Impala Daemon over its lifetime. | connections per second | cluster, impala, rack | CDH 4, CDH 5 |
| thrift_server_hiveserver2_frontend_connections_in_use | The number of active HiveServer2 API connections to this Impala Daemon. | connections | cluster, impala, rack | CDH 4, CDH 5 |
| thrift_server_hiveserver2_frontend_connections_rate | The total number of HiveServer2 API connections made to this Impala Daemon over its lifetime. | connections per second | cluster, impala, rack | CDH 4, CDH 5 |
| unexpected_exits_rate | The number of times the role's backing process exited unexpectedly. | exits per second | cluster, impala, rack | CDH 4, CDH 5 |
| uptime | For a host, the amount of time since the host was booted. For a role, the uptime of the backing process. | seconds | cluster, impala, rack | CDH 4, CDH 5 |
| web_metrics_collection_duration | Web Server Responsiveness | ms | cluster, impala, rack | CDH 4, CDH 5 |
| write_bytes_rate | The number of bytes written to the device | bytes per second | cluster, impala, rack | CDH 4, CDH 5 |
| active_cgroups | The number of cgroups currently managed by this Impala Daemon. | cgroups | cluster, impala, rack | CDH 5 |
| resource_requests_failed_rate | The total number of requests made to Llama that have failed over the life of this Impala Daemon. | requests per second | cluster, impala, rack | CDH 5 |
| resource_requests_fulfilled_rate | The total number of requests for resources made to Llama that have been fulfulled over the life of this Impala Daemon. | requests per second | cluster, impala, rack | CDH 5 |
| resource_requests_rate | The total number of requests made to Llama over the life of this Impala Daemon. | requests per second | cluster, impala, rack | CDH 5 |
| resource_requests_rejected_rate | The total number of requests for resources made to Llama that have been rejected over the life of this Impala Daemon. | requests per second | cluster, impala, rack | CDH 5 |
| resource_requests_released_rate | The total number of requests to release resources made to Llama over the life of this Impala Daemon. | requests per second | cluster, impala, rack | CDH 5 |
| resource_requests_timedout_rate | The total number of requests made to Llama that have timed out over the life of this Impala Daemon. | requests per second | cluster, impala, rack | CDH 5 |
| thrift_server_llama_callback_connections_in_use | The number of active Llama callback connections to this Impala Daemon. | connections | cluster, impala, rack | CDH 5 |
| thrift_server_llama_callback_connections_rate | The total number of Llama callback connections made to this Impala Daemon over its lifetime. | connections per second | cluster, impala, rack | CDH 5 |