Steven Rand 568512cc82 [SPARK-27773][SHUFFLE] add metrics for number of exceptions caught in ExternalShuffleBlockHandler ... ## What changes were proposed in this pull request? Add a metric for number of exceptions caught in the `ExternalShuffleBlockHandler`, the idea being that spikes in this metric over some time window (or more desirably, the lack thereof) can be used as an indicator of the health of an external shuffle service. (Where "health" refers to its ability to successfully respond to client requests.) ## How was this patch tested? Deployed a build of this PR to a YARN cluster, and confirmed that the NodeManagers' JMX metrics include `numCaughtExceptions`. Closes #24645 from sjrand/SPARK-27773. Authored-by: Steven Rand <srand@palantir.com> Signed-off-by: Marcelo Vanzin <vanzin@cloudera.com>		2019-05-30 13:57:15 -07:00
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src	[SPARK-27773][SHUFFLE] add metrics for number of exceptions caught in ExternalShuffleBlockHandler	2019-05-30 13:57:15 -07:00
pom.xml	[SPARK-25956] Make Scala 2.12 as default Scala version in Spark 3.0	2018-11-14 16:22:23 -08:00