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From "Aaron Davidson (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-6962) Netty BlockTransferService hangs in the middle of SQL query
Date Thu, 16 Apr 2015 19:41:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-6962?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron Davidson updated SPARK-6962:
----------------------------------
    Summary: Netty BlockTransferService hangs in the middle of SQL query  (was: Spark gets
stuck on a step, hangs forever - jobs do not complete)

> Netty BlockTransferService hangs in the middle of SQL query
> -----------------------------------------------------------
>
>                 Key: SPARK-6962
>                 URL: https://issues.apache.org/jira/browse/SPARK-6962
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.2.0, 1.2.1, 1.3.0
>            Reporter: Jon Chase
>         Attachments: jstacks.txt
>
>
> Spark SQL queries (though this seems to be a Spark Core issue - I'm just using queries
in the REPL to surface this, so I mention Spark SQL) hang indefinitely under certain (not
totally understood) circumstances.  
> This is resolved by setting spark.shuffle.blockTransferService=nio, which seems to point
to netty as the issue.  Netty was set as the default for the block transport layer in 1.2.0,
which is when this issue started.  Setting the service to nio allows queries to complete normally.
> I do not see this problem when running queries over smaller (~20 5MB files) datasets.
 When I increase the scope to include more data (several hundred ~5MB files), the queries
will get through several steps but eventuall hang  indefinitely.
> Here's the email chain regarding this issue, including stack traces:
> http://mail-archives.apache.org/mod_mbox/spark-user/201503.mbox/<CAE61SPFQt2y7D5vQZOMZZ2DMr-JX2c2ZgGCyky40npKjJx44hQ@mail.gmail.com>
> For context, here's the announcement regarding the block transfer service change: http://mail-archives.apache.org/mod_mbox/spark-dev/201411.mbox/<CABPQxssL04Q+rBLtP-D8W+z3aTn+g-Um6GMdGDnh-hZcvD-c_g@mail.gmail.com>



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