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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2020/10/23 13:38:39 UTC
[GitHub] [spark] maropu opened a new pull request #30140: [SPARK-33228][SQL] Don't uncache data when replacing a view having the same logical plan
maropu opened a new pull request #30140:
URL: https://github.com/apache/spark/pull/30140
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### What changes were proposed in this pull request?
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SPARK-30494's updated the `CreateViewCommand` code to implicitly drop cache when replacing an existing view. But, this change drops cache even when replacing a view having the same logical plan. A sequence of queries to reproduce this as follows;
```
// Spark v2.4.6+
scala> val df = spark.range(1).selectExpr("id a", "id b")
scala> df.cache()
scala> df.explain()
== Physical Plan ==
*(1) ColumnarToRow
+- InMemoryTableScan [a#2L, b#3L]
+- InMemoryRelation [a#2L, b#3L], StorageLevel(disk, memory, deserialized, 1 replicas)
+- *(1) Project [id#0L AS a#2L, id#0L AS b#3L]
+- *(1) Range (0, 1, step=1, splits=4)
scala> df.createOrReplaceTempView("t")
scala> sql("select * from t").explain()
== Physical Plan ==
*(1) ColumnarToRow
+- InMemoryTableScan [a#2L, b#3L]
+- InMemoryRelation [a#2L, b#3L], StorageLevel(disk, memory, deserialized, 1 replicas)
+- *(1) Project [id#0L AS a#2L, id#0L AS b#3L]
+- *(1) Range (0, 1, step=1, splits=4)
// If one re-runs the same query `df.createOrReplaceTempView("t")`, the cache's swept away
scala> df.createOrReplaceTempView("t")
scala> sql("select * from t").explain()
== Physical Plan ==
*(1) Project [id#0L AS a#2L, id#0L AS b#3L]
+- *(1) Range (0, 1, step=1, splits=4)
// Until v2.4.6
scala> val df = spark.range(1).selectExpr("id a", "id b")
scala> df.cache()
scala> df.createOrReplaceTempView("t")
scala> sql("select * from t").explain()
20/10/23 22:33:42 WARN ObjectStore: Failed to get database global_temp, returning NoSuchObjectException
== Physical Plan ==
*(1) InMemoryTableScan [a#2L, b#3L]
+- InMemoryRelation [a#2L, b#3L], StorageLevel(disk, memory, deserialized, 1 replicas)
+- *(1) Project [id#0L AS a#2L, id#0L AS b#3L]
+- *(1) Range (0, 1, step=1, splits=4)
scala> df.createOrReplaceTempView("t")
scala> sql("select * from t").explain()
== Physical Plan ==
*(1) InMemoryTableScan [a#2L, b#3L]
+- InMemoryRelation [a#2L, b#3L], StorageLevel(disk, memory, deserialized, 1 replicas)
+- *(1) Project [id#0L AS a#2L, id#0L AS b#3L]
+- *(1) Range (0, 1, step=1, splits=4)
```
### Why are the changes needed?
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bugfix.
### Does this PR introduce _any_ user-facing change?
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No.
### How was this patch tested?
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Added tests.
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[GitHub] [spark] maropu commented on pull request #30140: [SPARK-33228][SQL] Don't uncache data when replacing a view having the same logical plan
Posted by GitBox <gi...@apache.org>.
maropu commented on pull request #30140:
URL: https://github.com/apache/spark/pull/30140#issuecomment-716335395
Thanks, @HyukjinKwon and @dongjoon-hyun !
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[GitHub] [spark] dongjoon-hyun commented on pull request #30140: [SPARK-33228][SQL] Don't uncache data when replacing a view having the same logical plan
Posted by GitBox <gi...@apache.org>.
dongjoon-hyun commented on pull request #30140:
URL: https://github.com/apache/spark/pull/30140#issuecomment-716686602
@viirya . Wait. This PR passed the UT initially.
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[GitHub] [spark] dongjoon-hyun commented on pull request #30140: [SPARK-33228][SQL] Don't uncache data when replacing a view having the same logical plan
Posted by GitBox <gi...@apache.org>.
dongjoon-hyun commented on pull request #30140:
URL: https://github.com/apache/spark/pull/30140#issuecomment-716778229
@maropu . Could you make a backporting PR to branch-2.4?
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[GitHub] [spark] viirya commented on pull request #30140: [SPARK-33228][SQL] Don't uncache data when replacing a view having the same logical plan
Posted by GitBox <gi...@apache.org>.
viirya commented on pull request #30140:
URL: https://github.com/apache/spark/pull/30140#issuecomment-716687558
@dongjoon-hyun It only failed in branch-2.4.
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[GitHub] [spark] SparkQA commented on pull request #30140: [SPARK-33228][SQL] Don't uncache data when replacing a view having the same logical plan
Posted by GitBox <gi...@apache.org>.
SparkQA commented on pull request #30140:
URL: https://github.com/apache/spark/pull/30140#issuecomment-715499999
**[Test build #130203 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/130203/testReport)** for PR 30140 at commit [`edd966a`](https://github.com/apache/spark/commit/edd966a0ccf79790ffca77fa2806e4ca80a48087).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds no public classes.
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[GitHub] [spark] viirya commented on pull request #30140: [SPARK-33228][SQL] Don't uncache data when replacing a view having the same logical plan
Posted by GitBox <gi...@apache.org>.
viirya commented on pull request #30140:
URL: https://github.com/apache/spark/pull/30140#issuecomment-716672636
Hi @maropu @HyukjinKwon @dongjoon-hyun , this seem to cause Python test failed in 2.4 (https://github.com/apache/spark/runs/1307296057). I'm going to revert it from 2.4.
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[GitHub] [spark] HyukjinKwon commented on pull request #30140: [SPARK-33228][SQL] Don't uncache data when replacing a view having the same logical plan
Posted by GitBox <gi...@apache.org>.
HyukjinKwon commented on pull request #30140:
URL: https://github.com/apache/spark/pull/30140#issuecomment-715649695
Looks making sense to me. FYI @dongjoon-hyun. cc @cloud-fan since you're taking a look for views.
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[GitHub] [spark] maropu commented on a change in pull request #30140: [SPARK-33228][SQL] Don't uncache data when replacing a view having the same logical plan
Posted by GitBox <gi...@apache.org>.
maropu commented on a change in pull request #30140:
URL: https://github.com/apache/spark/pull/30140#discussion_r510890458
##########
File path: sql/core/src/main/scala/org/apache/spark/sql/execution/command/views.scala
##########
@@ -110,17 +110,19 @@ case class CreateViewCommand(
verifyTemporaryObjectsNotExists(catalog)
if (viewType == LocalTempView) {
- if (replace && catalog.getTempView(name.table).isDefined) {
- logDebug(s"Try to uncache ${name.quotedString} before replacing.")
+ if (replace && catalog.getTempView(name.table).isDefined &&
+ !catalog.getTempView(name.table).get.sameResult(child)) {
+ logInfo(s"Try to uncache ${name.quotedString} before replacing.")
Review comment:
I think this message is useful for users, so I changed `logDebug` -> `logInfo`.
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[GitHub] [spark] viirya edited a comment on pull request #30140: [SPARK-33228][SQL] Don't uncache data when replacing a view having the same logical plan
Posted by GitBox <gi...@apache.org>.
viirya edited a comment on pull request #30140:
URL: https://github.com/apache/spark/pull/30140#issuecomment-716672636
Hi @maropu @HyukjinKwon @dongjoon-hyun , this seem to cause Python test failed in 2.4 (https://github.com/apache/spark/runs/1307296057) even I re-ran it. I'm going to revert it from 2.4.
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[GitHub] [spark] dongjoon-hyun closed pull request #30140: [SPARK-33228][SQL] Don't uncache data when replacing a view having the same logical plan
Posted by GitBox <gi...@apache.org>.
dongjoon-hyun closed pull request #30140:
URL: https://github.com/apache/spark/pull/30140
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[GitHub] [spark] SparkQA commented on pull request #30140: [SPARK-33228][SQL] Don't uncache data when replacing a view having the same logical plan
Posted by GitBox <gi...@apache.org>.
SparkQA commented on pull request #30140:
URL: https://github.com/apache/spark/pull/30140#issuecomment-715388483
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[GitHub] [spark] maropu commented on pull request #30140: [SPARK-33228][SQL] Don't uncache data when replacing a view having the same logical plan
Posted by GitBox <gi...@apache.org>.
maropu commented on pull request #30140:
URL: https://github.com/apache/spark/pull/30140#issuecomment-716846073
okay, I will today.
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URL: https://github.com/apache/spark/pull/30140#issuecomment-715375093
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**[Test build #130203 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/130203/testReport)** for PR 30140 at commit [`edd966a`](https://github.com/apache/spark/commit/edd966a0ccf79790ffca77fa2806e4ca80a48087).
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[GitHub] [spark] maropu commented on pull request #30140: [SPARK-33228][SQL] Don't uncache data when replacing a view having the same logical plan
Posted by GitBox <gi...@apache.org>.
maropu commented on pull request #30140:
URL: https://github.com/apache/spark/pull/30140#issuecomment-717236435
https://github.com/apache/spark/pull/30157
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