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Posted to reviews@spark.apache.org by ericl <gi...@git.apache.org> on 2016/06/07 01:51:40 UTC
[GitHub] spark pull request #13537: [SPARK-15794] Should truncate toString() of very ...
GitHub user ericl opened a pull request:
https://github.com/apache/spark/pull/13537
[SPARK-15794] Should truncate toString() of very wide schemas
## What changes were proposed in this pull request?
With very wide tables, e.g. thousands of fields, the output is unreadable and often causes OOMs due to inefficient string processing. This truncates all struct and operator field lists to a user configurable threshold to limit performance and readability impact.
It would also be nice to optimize string generation to avoid these sort of O(n^2) slowdowns entirely (i.e. use StringBuilder everywhere including expressions), but this is probably too large of a change for 2.0 at this point.
## How was this patch tested?
Added a microbenchmark that covers this case particularly well. I also ran the microbenchmark while varying the truncation threshold.
```
numFields = 5
wide shallowly nested struct field r/w: Best/Avg Time(ms) Rate(M/s) Per Row(ns) Relative
------------------------------------------------------------------------------------------------
2000 wide x 50 rows (write in-mem) 2336 / 2558 0.0 23364.4 0.1X
numFields = 25
wide shallowly nested struct field r/w: Best/Avg Time(ms) Rate(M/s) Per Row(ns) Relative
------------------------------------------------------------------------------------------------
2000 wide x 50 rows (write in-mem) 4237 / 4465 0.0 42367.9 0.1X
numFields = 100
wide shallowly nested struct field r/w: Best/Avg Time(ms) Rate(M/s) Per Row(ns) Relative
------------------------------------------------------------------------------------------------
2000 wide x 50 rows (write in-mem) 10458 / 11223 0.0 104582.0 0.0X
numFields = Infinity
wide shallowly nested struct field r/w: Best/Avg Time(ms) Rate(M/s) Per Row(ns) Relative
------------------------------------------------------------------------------------------------
[info] java.lang.OutOfMemoryError: Java heap space
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ericl/spark truncated-string
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13537.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #13537
----
commit d16e0f3e22287a7f3779ed24239d84179602e30a
Author: Eric Liang <ek...@databricks.com>
Date: 2016-06-07T00:56:06Z
truncate strings
commit f4f4368d3550b864c6286ce04770990b41c6741c
Author: Eric Liang <ek...@databricks.com>
Date: 2016-06-07T01:37:13Z
Mon Jun 6 18:37:13 PDT 2016
commit 17f98d76aec40bc7c6b8c46925d4013f9bccd639
Author: Eric Liang <ek...@databricks.com>
Date: 2016-06-07T01:43:24Z
Mon Jun 6 18:43:24 PDT 2016
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[GitHub] spark pull request #13537: [SPARK-15794] Should truncate toString() of very ...
Posted by ericl <gi...@git.apache.org>.
Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/13537#discussion_r66197227
--- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala ---
@@ -293,8 +294,8 @@ case class StructType(fields: Array[StructField]) extends DataType with Seq[Stru
override def defaultSize: Int = fields.map(_.dataType.defaultSize).sum
override def simpleString: String = {
- val fieldTypes = fields.map(field => s"${field.name}:${field.dataType.simpleString}")
- s"struct<${fieldTypes.mkString(",")}>"
+ val fieldTypes = fields.map(field => s"${field.name}: ${field.dataType.simpleString}")
--- End diff --
TODO maybe this should use a SeqView to avoid eagerly calling toString() on child fields.
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[GitHub] spark issue #13537: [SPARK-15794] Should truncate toString() of very wide pl...
Posted by SparkQA <gi...@git.apache.org>.
Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/13537
**[Test build #60151 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/60151/consoleFull)** for PR 13537 at commit [`68a97dc`](https://github.com/apache/spark/commit/68a97dc5c0c62f13eca374190a02a46f9f050e15).
* This patch **fails Spark unit tests**.
* This patch **does not merge cleanly**.
* This patch adds no public classes.
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[GitHub] spark issue #13537: [SPARK-15794] Should truncate toString() of very wide pl...
Posted by JoshRosen <gi...@git.apache.org>.
Github user JoshRosen commented on the issue:
https://github.com/apache/spark/pull/13537
LGTM, so I'm going to merge this to master and branch-2.0.
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* This patch **fails Spark unit tests**.
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https://github.com/apache/spark/pull/13537
cc @JoshRosen
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[GitHub] spark pull request #13537: [SPARK-15794] Should truncate toString() of very ...
Posted by asfgit <gi...@git.apache.org>.
Github user asfgit closed the pull request at:
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**[Test build #60185 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/60185/consoleFull)** for PR 13537 at commit [`4b817cd`](https://github.com/apache/spark/commit/4b817cdc8269dd0f7ae5b5bae623f4fbac4f54b0).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class CreateTempViewUsing(`
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* This patch **fails Spark unit tests**.
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**[Test build #60093 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/60093/consoleFull)** for PR 13537 at commit [`17f98d7`](https://github.com/apache/spark/commit/17f98d76aec40bc7c6b8c46925d4013f9bccd639).
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**[Test build #60093 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/60093/consoleFull)** for PR 13537 at commit [`17f98d7`](https://github.com/apache/spark/commit/17f98d76aec40bc7c6b8c46925d4013f9bccd639).
* This patch **fails Spark unit tests**.
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* This patch adds no public classes.
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* This patch **fails Scala style tests**.
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[GitHub] spark issue #13537: [SPARK-15794] Should truncate toString() of very wide pl...
Posted by AmplabJenkins <gi...@git.apache.org>.
Github user AmplabJenkins commented on the issue:
https://github.com/apache/spark/pull/13537
Merged build finished. Test FAILed.
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[GitHub] spark issue #13537: [SPARK-15794] Should truncate toString() of very wide pl...
Posted by SparkQA <gi...@git.apache.org>.
Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/13537
**[Test build #60153 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/60153/consoleFull)** for PR 13537 at commit [`c52c44d`](https://github.com/apache/spark/commit/c52c44df2552c81e46a36c1a449d11e08ea10bb5).
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