THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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| Name | Functionality | Interface | Implementation(s) |
|---|---|---|---|
| Metrics Service |
| org.apache.ambari.server.metrics.system.MetricsService | org.apache.ambari.server.metrics.system.impl.MetricsServiceImpl |
| Metric Source |
| org.apache.ambari.server.metrics.system.MetricsSource | org.apache.ambari.server.metrics.system.impl.JvmMetricsSource org.apache.ambari.server.metrics.system.impl.DatabaseMetricsSource |
| Metric Sink |
| org.apache.ambari.server.metrics.system.MetricsSink | org.apache.ambari.server.metrics.system.impl.AmbariMetricSinkImpl |
Configuration
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/ Enabling
- To enable Ambari Server metrics, make sure the following config file exists during Ambari Server start/restart - All the metrics related configuration are present in the /etc/ambari-server/conf/metrics.properties file. .
- Currently, only 2 metric sources have been implemented - JVM Metric Source and Database Metric Source.
- To add / remove a metric source to be tracked the following config needs to be modified in the metrics.properties file.
metric.sources=jvm,database - Source specific configs are discussed in the metrics source section.
Metric Sources
JVM Metrics
Working
- Collects and publishes Ambari Server JVM related metrics using Codahale library.
- Metrics collected for GC, Buffers, Threads, Memory and File descriptor.
- To enable this source, add "jvm" to the metric.sources config in metrics.properties and restart Ambari Server.
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The EclipseLink PeformanceMonitor has been extended to support a custom Ambari Database Metrics source. It provides us with monitoring data per entity and per operation on the entity.
The Performance Monitor provides 2 kinds of metrics -
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In addition to the Counter & Timer metrics collected from EclipseLink, a computed metric of Timer/Counter (divided by) is also sent. This metrics provides the average time taken for an operation across time.
For example, if
Counter Metric : Counter.ReadAllQuery.HostRoleCommandEntity = 10000
Timer Metric : Timer.ReadAllQuery.HostRoleCommandEntity = 50
Computed Metric (Avg time for the operation) : ReadAllQuery.HostRoleCommandEntity = 200 (10000 div by 50)
As seen above, the computed metric name will be the same as the Timer & Counter metric except without the 'Timer.' / 'Counter.' prefix.
To enable this source, add "database" to the metric.sources config in metrics.properties and restart Ambari Server.
Configs
| Config Name | Default Value | Explanation |
|---|---|---|
source.database.class | org.apache.ambari.server.metrics.system.impl.DatabaseMetricsSource | Class used to collect Database Metrics from extended Performance Monitor class - org.apache.ambari.server.metrics.system.impl.AmbariPerformanceMonitor. |
source.database.performance.monitor.query.weight | HEAVY | EclipseLink Performance monitor granularity : NONE / NORMAL / HEAVY / ALL |
source.database.monitor.dumptime | 60000 | Collection interval in milliseconds |
source.database.monitor.entities | Cluster(.*)Entity,Host(.*)Entity,ExecutionCommandEntity, ServiceComponentDesiredStateEntity,Alert(.*)Entity,StackEntity,StageEntity | Only these entities' metrics will be collected and tracked. (org.apache.ambari.server.orm.entities). |
source.database.monitor.query.keywords.include | CacheMisses | Include some metrics which have the keyword even if they are not part of requested Entities. |
Configs
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Grafana dashboards
Ambari database metrics have been represented in 2 Grafana dashboards.
- 'Ambari Server - Database' dashboard
- An aggregate dashboard that displays Total ReadAllQuery, Cache Hits, Cache Misses, Query Stages, Query Types across all entities.
- It also contains an example of how to visualize Timer, Counter and Avg Timing data for a specific entity - HostRoleCommandEntity.
- 'Ambari Server - Top N Entities' dashboard
- Shows Top N entities that have maximum number of ReadAllQuery operations done on them.
- Shows Top N entities that the database spent the most time in ReadAllQuery operations.
- Shows Top N entities that have maximum Cache Misses
These dashboard graphs are meant to provide an example of how to create graphs to query specific entities or operations in an Ad Hoc manner.
Disabling Ambari Server metrics globally
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