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https://issues.apache.org/jira/browse/SPARK-6962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14500224#comment-14500224
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Michael Allman commented on SPARK-6962:
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[~ilikerps] Okay. We're still in the process of our Spark 1.3 migration. Once
that's complete I will run some test queries and check the executor logs.
Should I set the log level to debug or is that too noisy?
Also, I forgot to mention here that we seem to have found an effective
workaround by setting spark.shuffle.blockTransferService to nio rather than the
default netty. This has been confirmed to be working by two other members of
the mailing list.
> 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-jx2c2zggcyky40npkjjx4...@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-...@mail.gmail.com>
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