[jira] [Assigned] (HIVE-16854) SparkClientFactory is locked too aggressively

["Rui Li (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-16854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rui Li reassigned HIVE-16854:
-----------------------------

    Assignee: Rui Li

> 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
>            Assignee: Rui Li
>         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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