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[SPARK-29786][SQL] Fix MetaException when dropping a partition not exists on HDFS #26422

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[SPARK-29786][SQL] Fix MetaException when dropping a partition not exists on HDFS #26422

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90233e4
Merge pull request #1 from apache/master
Deegue Oct 22, 2019
7a246d5
Merge pull request #2 from apache/master
Deegue Oct 28, 2019
783211f
Merge pull request #3 from apache/master
Deegue Nov 5, 2019
355496e
Fix drop partition MetaException:File does not exist.
Deegue Nov 7, 2019
74d5984
Add notes.
Deegue Nov 14, 2019
84b1da8
1584531350
Deegue Mar 18, 2020
248b6cf
UT failed #119927, getDataLocation->getPartitionPath
Deegue Mar 20, 2020
c20c390
UT failed #120076, add HIDDEN_FILES_PATH_FILTER
Deegue Mar 20, 2020
9d75854
optimize
Deegue Mar 20, 2020
5a5ff74
UT failed #120087. Hive-0.13 doesn't have `Partition.getPartitionPath…
Deegue Mar 20, 2020
f4b3793
UT failed #120093, purge and ignoreIfNotExists should be false.
Deegue Mar 20, 2020
4d1c35e
isEmptyPath->isExistPath
Deegue Mar 27, 2020
7cf7c6b
remove redundant code
Deegue Mar 27, 2020
f8b96de
restore '!'
Deegue May 29, 2020
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UT failed #120087. Hive-0.13 doesn't have `Partition.getPartitionPath… 
…()`, using Partition.getPath() instead.
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Deegue committed Mar 20, 2020
commit 5a5ff7432d28c64b25c28ea74ba2d30d80ea6c2c
2 changes: 1 addition & 1 deletion sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala
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Expand Up @@ -658,7 +658,7 @@ private[hive] class HiveClientImpl(
// Check whether the partition we are going to drop is empty.
// We make a dummy one for the empty partition. See [SPARK-29786] for more details.
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@cloud-fan cloud-fan Mar 2, 2020

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is this how hive resolve the problem?

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@Deegue Deegue Mar 17, 2020

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is this how hive resolve the problem?

Yes, It's the same method as Hive uses.

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@cloud-fan cloud-fan Mar 17, 2020

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Isn't it bad for performance? i.e. you call fs.exists and fs.listStatus for each partition.

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@Deegue Deegue Mar 17, 2020 •
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Isn't it bad for performance? i.e. you call fs.exists and fs.listStatus for each partition.

Yes, but only affect drop partitions. I think it's necessary and won't take much time to do the check while dropping.

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@cloud-fan cloud-fan Mar 23, 2020

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Can you point to the Hive source code that does the same thing? i.e. create a dummy directory before dropping the partition.

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@Deegue Deegue Mar 24, 2020

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Can you point to the Hive source code that does the same thing? i.e. create a dummy directory before dropping the partition.

In Hive 1.x, it's like this.

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@cloud-fan cloud-fan Mar 24, 2020

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is it for DROP PARTITION?

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@Deegue Deegue Mar 24, 2020

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is it for DROP PARTITION?

No, it will check every query before executing. Maybe it's better to do the check before all queries?

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@cloud-fan cloud-fan Mar 24, 2020

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Does Spark have a problem to do table scan when partition directory not exist?

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@Deegue Deegue Mar 26, 2020 •
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Does Spark have a problem to do table scan when partition directory not exist?

It's related to #24668, and controlled by spark.sql.files.ignoreMissingFiles.
Spark will check it when listing leaf files.

parts.foreach { partition =>
val partPath = partition.getPartitionPath
val partPath = partition.getPath.head
if (isEmptyPath(partPath)) {
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@cloud-fan cloud-fan Mar 26, 2020

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I think we need to check non-existing path, not empty path?

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@Deegue Deegue Mar 27, 2020

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I think we need to check non-existing path, not empty path?

Yes, you're right. We only need to check the existence of path instead of those under the path.

val fs = partPath.getFileSystem(conf)
fs.mkdirs(partPath)
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