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https://issues.apache.org/jira/browse/HIVE-16854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16042140#comment-16042140
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Rui Li commented on HIVE-16854:
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Thanks Xuefu for finding the issue. I'll take a look.
> SparkClientFactory is locked too aggressively
> ---------------------------------------------
>
> Key: HIVE-16854
> URL: https://issues.apache.org/jira/browse/HIVE-16854
> Project: Hive
> Issue Type: Bug
> Components: Spark
> Affects Versions: 1.1.0
> Reporter: Xuefu Zhang
> Attachments: 15763.jstack
>
>
> Most methods in SparkClientFactory are synchronized on the SparkClientFactory
> singleton. However, some methods are very expensive, such as createClient(),
> which returns a SparkClientImpl instance. However, creating a SparkClientImpl
> instance requires starting a remote driver to connect back to RPCServer. This
> process can take a long time such as in case of a busy yarn queue. When this
> happens, all pending calls on SparkClientFactory will have to wait for a
> long time.
> In our case, hive.spark.client.server.connect.timeout is set to 1hr. This
> makes some queries waiting for hours before starting.
> The current implementation seems pretty much making all remote driver
> launches serialized. If one of them takes time, the following ones will have
> to wait.
> HS2 stacktrace is attached for reference. It's based on earlier version of
> Hive, so the line numbers might be slightly off.
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