Exposing Hadoop Metrics to Ganglia
Core Hadoop services and HBase support the writing of their metrics to Ganglia, a data representation and visualization tool.
HDFS, YARN, and HBase support the Metrics2 framework; MapReduce1 and HBase support the Metrics framework. See the Cloudera blog post, What is Hadoop Metrics2?
Configure Hadoop Metrics for Ganglia Using Cloudera Manager
Minimum Required Role: Configurator (also provided by Cluster Administrator, Full Administrator)
- Go to the Home page by clicking the Cloudera Manager logo.
- Click .
- Search on the term Metrics.
- To configure HDFS, YARN, or HBase, use Hadoop Metrics2 Advanced Configuration Snippet (Safety Valve). For MapReduce1 (or HBase), use Hadoop Metrics Advanced Configuration Snippet (Safety Valve).
- Click Edit Individual Values to see the supported daemons and their default groups.
- Configure each default group with a metrics class, sampling period, and Ganglia server. See the tables below.
- To add optional parameters for socket connection retry, modify this example as necessary:
*.sink.ganglia.retry_socket_interval=60000 #in milliseconds *.sink.ganglia.socket_connection_retries=10 #Set it to 0 if you do not want it to be retried
- To define a filter, which is recommended for preventing YARN metrics from overwhelming the Ganglia server, do so on the sink side. For example:
*.source.filter.class=org.apache.hadoop.metrics2.filter.GlobFilter *.record.filter.class=${*.source.filter.class} *.metric.filter.class=${*.source.filter.class} nodemanager.sink.ganglia.record.filter.exclude=ContainerResource*
- Click Save Changes.
- Restart the Cluster or Service depending on the scope of your changes.
Ganglia Configuration Settings Per Daemon
Service | Daemon Default Group | Ganglia Configuration Settings |
---|---|---|
HBase | Master and RegionServer |
*.sink.ganglia.class=org.apache.hadoop.metrics2.sink.ganglia.GangliaSink31 *.period=10 hbase.sink.ganglia.servers=<hostname>:<port> |
HDFS | DataNode |
*.sink.ganglia.class=org.apache.hadoop.metrics2.sink.ganglia.GangliaSink31 *.period=10 datanode.sink.ganglia.servers=<hostname>:<port> |
NameNode |
*.sink.ganglia.class=org.apache.hadoop.metrics2.sink.ganglia.GangliaSink31 *.period=10 namenode.sink.ganglia.servers=<hostname>:<port> |
|
SecondaryNameNode |
*.sink.ganglia.class=org.apache.hadoop.metrics2.sink.ganglia.GangliaSink31 *.period=10 secondarynamenode.sink.ganglia.servers=<hostname>:<port> |
|
YARN | NodeManager |
*.sink.ganglia.class=org.apache.hadoop.metrics2.sink.ganglia.GangliaSink31 *.period=10 nodemanager.sink.ganglia.servers=<hostname>:<port> |
ResourceManager |
*.sink.ganglia.class=org.apache.hadoop.metrics2.sink.ganglia.GangliaSink31 *.period=10 resourcemanager.sink.ganglia.servers=<hostname>:<port> |
|
JobHistory Server |
*.sink.ganglia.class=org.apache.hadoop.metrics2.sink.ganglia.GangliaSink31 *.period=10 jobhistoryserver.sink.ganglia.servers=<hostname>:<port> |
Note: To use metrics, set values for each context. For example, for MapReduce1,
add values for both the JobTracker Default Group and the TaskTracker Default Group.
Service | Daemon Default Group | Ganglia Configuration Settings |
---|---|---|
HBase | Master |
hbase.class=org.apache.hadoop.metrics.ganglia.GangliaContext31 hbase.period=10 hbase.servers=<hostname>:<port> jvm.class=org.apache.hadoop.metrics.ganglia.GangliaContext31 jvm.period=10 jvm.servers=<hostname>:<port> rpc.class=org.apache.hadoop.metrics.ganglia.GangliaContext31 rpc.period=10 rpc.servers=<hostname>:<port> |
RegionServer | ||
MapReduce1 | JobTracker |
dfs.class=org.apache.hadoop.metrics.ganglia.GangliaContext dfs.period=10 dfs.servers=<hostname>:<port> mapred.class=org.apache.hadoop.metrics.ganglia.GangliaContext mapred.period=10 mapred.servers=<hostname>:<port> jvm.class=org.apache.hadoop.metrics.ganglia.GangliaContext jvm.period=10 jvm.servers=<hostname>:<port> rpc.class=org.apache.hadoop.metrics.ganglia.GangliaContext rpc.period=10 rpc.servers=<hostname>:<port> |
TaskTracker |
Page generated July 25, 2018.
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