Thanks for Cheng's help.
It must be something wrong with InferFiltersFromConstraints, I just removed
InferFiltersFromConstraints from
org/apache/spark/sql/catalyst/optimizer/Optimizer.scala to avoid this issue. I
will analysis this issue with the method your provided.
------------------ Original ------------------
From: "Cheng Lian [via Apache Spark Developers
List]";<ml-node+s1001551n21069...@n3.nabble.com>;
Send time: Friday, Feb 24, 2017 2:28 AM
To: "Stan Zhai"<m...@zhaishidan.cn>;
Subject: Re: The driver hangs at DataFrame.rdd in Spark 2.1.0
This one seems to be relevant, but it's already fixed in 2.1.0.
One way to debug is to turn on trace log and check how the
analyzer/optimizer behaves.
On 2/22/17 11:11 PM, StanZhai wrote:
Could this be related to
https://issues.apache.org/jira/browse/SPARK-17733 ?
------------------ Original ------------------
From: "Cheng Lian-3 [via Apache Spark Developers
List]";<[hidden email]>;
Send time: Thursday, Feb 23, 2017 9:43 AM
To: "Stan Zhai"<[hidden email]>;
Subject: Re: The driver hangs at DataFrame.rdd in Spark
2.1.0
Just from the thread dump you provided, it seems that this particular
query plan jams our optimizer. However, it's also possible that the
driver just happened to be running optimizer rules at that particular
time point.
Since query planning doesn't touch any actual data, could you please
try to minimize this query by replacing the actual relations with
temporary views derived from Scala local collections? In this way, it
would be much easier for others to reproduce issue.
Cheng
On 2/22/17 5:16 PM, Stan Zhai wrote:
Thanks for lian's reply.
Here is the QueryPlan generated by Spark 1.6.2(I can't
get it in Spark 2.1.0):
...
------------------ Original ------------------
Subject: Re: The driver hangs at
DataFrame.rdd in Spark 2.1.0
What is the query plan? We had once observed query plans that
grow exponentially in iterative ML workloads and the query
planner hangs forever. For example, each iteration combines 4
plan trees of the last iteration and forms a larger plan tree.
The size of the plan tree can easily reach billions of nodes
after 15 iterations.
On 2/22/17 9:29 AM, Stan Zhai wrote:
Hi all,
The driver hangs at DataFrame.rdd in Spark 2.1.0 when
the DataFrame(SQL) is complex, Following thread dump of my
driver:
...
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