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Sahil Takiar commented on HIVE-16484: ------------------------------------- Hey [~lirui], thanks for taking a look. You bring up a good point about the {{LauncherServer}} and {{LauncherBackend}}, we probably don't need those and using them would double the # of connections required for HoS sessions. [~vanzin] would it be possible to avoid using the {{LauncherServer}} / {{LauncherBackend}} for the {{InProcessLauncher}} when in {{yarn-cluster}} mode? If not, maybe we could just do the same thing that {{InProcessLauncher}} is doing? It looks like it invokes {{SparkSubmit#main}} directly. > Investigate SparkLauncher for HoS as alternative to bin/spark-submit > -------------------------------------------------------------------- > > Key: HIVE-16484 > URL: https://issues.apache.org/jira/browse/HIVE-16484 > Project: Hive > Issue Type: Bug > Components: Spark > Reporter: Sahil Takiar > Assignee: Sahil Takiar > Attachments: HIVE-16484.1.patch, HIVE-16484.10.patch, > HIVE-16484.2.patch, HIVE-16484.3.patch, HIVE-16484.4.patch, > HIVE-16484.5.patch, HIVE-16484.6.patch, HIVE-16484.7.patch, > HIVE-16484.8.patch, HIVE-16484.9.patch > > > The {{SparkClientImpl#startDriver}} currently looks for the {{SPARK_HOME}} > directory and invokes the {{bin/spark-submit}} script, which spawns a > separate process to run the Spark application. > {{SparkLauncher}} was added in SPARK-4924 and is a programatic way to launch > Spark applications. > I see a few advantages: > * No need to spawn a separate process to launch a HoS --> lower startup time > * Simplifies the code in {{SparkClientImpl}} --> easier to debug > * {{SparkLauncher#startApplication}} returns a {{SparkAppHandle}} which > contains some useful utilities for querying the state of the Spark job > ** It also allows the launcher to specify a list of job listeners -- This message was sent by Atlassian JIRA (v6.4.14#64029)