ShuffleMetricsSource

= ShuffleMetricsSource

ShuffleMetricsSource is the metrics:spark-metrics-Source.md[metrics source] of a storage:BlockManager.md[] for <>.

ShuffleMetricsSource lives on a Spark executor and is executor:Executor.md#creating-instance-BlockManager-shuffleMetricsSource[registered only when a Spark application runs in a non-local / cluster mode].

.Registering ShuffleMetricsSource with "executor" MetricsSystem image::ShuffleMetricsSource.png[align="center"]

== [[creating-instance]] Creating Instance

ShuffleMetricsSource takes the following to be created:

• <>
• <>

ShuffleMetricsSource is created when BlockManager is requested for the storage:BlockManager.md#shuffleMetricsSource[shuffle metrics source].

== [[sourceName]] Source Name

ShuffleMetricsSource is given a name when <> that is one of the following:

• NettyBlockTransfer when spark.shuffle.service.enabled configuration property is off (false)

• ExternalShuffle when spark.shuffle.service.enabled configuration property is on (true)