[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[vanzin]

Github user vanzin commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r164551253
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/IsolatedClientLoader.scala
 ---
@@ -251,10 +251,8 @@ private[hive] class IsolatedClientLoader(
 
   /** The isolated client interface to Hive. */
   private[hive] def createClient(): HiveClient = synchronized {
-val warehouseDir = 
Option(hadoopConf.get(ConfVars.METASTOREWAREHOUSE.varname))
 if (!isolationOn) {
-  return new HiveClientImpl(version, warehouseDir, sparkConf, 
hadoopConf, config,
-baseClassLoader, this)
+  return new HiveClientImpl(version, sparkConf, hadoopConf, config, 
baseClassLoader, this)
--- End diff --

Adding a comment about exactly why any of the proposed changes are needed 
is really the only thing that can make this code more understandable. I had 
that in the bug and in my commit message, but in hindsight, it really should be 
in the code.

Without the comment, all versions are equally complex, because the 
complexity has nothing to do with how many arguments you have or their type.


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[cloud-fan]

Github user cloud-fan commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r164050130
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/IsolatedClientLoader.scala
 ---
@@ -251,10 +251,8 @@ private[hive] class IsolatedClientLoader(
 
   /** The isolated client interface to Hive. */
   private[hive] def createClient(): HiveClient = synchronized {
-val warehouseDir = 
Option(hadoopConf.get(ConfVars.METASTOREWAREHOUSE.varname))
 if (!isolationOn) {
-  return new HiveClientImpl(version, warehouseDir, sparkConf, 
hadoopConf, config,
-baseClassLoader, this)
+  return new HiveClientImpl(version, sparkConf, hadoopConf, config, 
baseClassLoader, this)
--- End diff --

@HyukjinKwon 's proposal looks good with this type alias and comments, so 
people can know what happened here. But due to personal taste, I prefer the 
wrapper solution as it looks cleaner to me and don't need to build a map or a 
O(n) lookup :-/


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[HyukjinKwon]

Github user HyukjinKwon commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r164043733
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/IsolatedClientLoader.scala
 ---
@@ -251,10 +251,8 @@ private[hive] class IsolatedClientLoader(
 
   /** The isolated client interface to Hive. */
   private[hive] def createClient(): HiveClient = synchronized {
-val warehouseDir = 
Option(hadoopConf.get(ConfVars.METASTOREWAREHOUSE.varname))
 if (!isolationOn) {
-  return new HiveClientImpl(version, warehouseDir, sparkConf, 
hadoopConf, config,
-baseClassLoader, this)
+  return new HiveClientImpl(version, sparkConf, hadoopConf, config, 
baseClassLoader, this)
--- End diff --

Or simply just iterate it with O(n) as said in 
https://github.com/apache/spark/pull/20377/files#r163920410.


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[HyukjinKwon]

Github user HyukjinKwon commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r164043569
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/IsolatedClientLoader.scala
 ---
@@ -251,10 +251,8 @@ private[hive] class IsolatedClientLoader(
 
   /** The isolated client interface to Hive. */
   private[hive] def createClient(): HiveClient = synchronized {
-val warehouseDir = 
Option(hadoopConf.get(ConfVars.METASTOREWAREHOUSE.varname))
 if (!isolationOn) {
-  return new HiveClientImpl(version, warehouseDir, sparkConf, 
hadoopConf, config,
-baseClassLoader, this)
+  return new HiveClientImpl(version, sparkConf, hadoopConf, config, 
baseClassLoader, this)
--- End diff --

How about something like this then if it really matters?

```diff
--- 
a/sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala
+++ 
b/sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala
@@ -83,9 +83,8 @@ import org.apache.spark.util.{CircularBuffer, Utils}
  */
 private[hive] class HiveClientImpl(
 override val version: HiveVersion,
-warehouseDir: Option[String],
 sparkConf: SparkConf,
-hadoopConf: JIterable[JMap.Entry[String, String]],
+hadoopConf: HadoopConfiguration,
 extraConfig: Map[String, String],
 initClassLoader: ClassLoader,
 val clientLoader: IsolatedClientLoader)
@@ -106,6 +105,8 @@ private[hive] class HiveClientImpl(
 case hive.v2_1 => new Shim_v2_1()
   }

+  private val hadoopConfMap = hadoopConf.iterator().asScala.map(e => 
e.getKey -> e.getValue).toMap
+
   // Create an internal session state for this HiveClientImpl.
   val state: SessionState = {
 val original = Thread.currentThread().getContextClassLoader
@@ -132,7 +133,7 @@ private[hive] class HiveClientImpl(
   if (ret != null) {
 // hive.metastore.warehouse.dir is determined in SharedState after 
the CliSessionState
 // instance constructed, we need to follow that change here.
-warehouseDir.foreach { dir =>
+hadoopConfMap.get(ConfVars.METASTOREWAREHOUSE.varname).foreach { 
dir =>
   ret.getConf.setVar(ConfVars.METASTOREWAREHOUSE, dir)
 }
 ret
@@ -166,8 +167,7 @@ private[hive] class HiveClientImpl(
 // has hive-site.xml. So, HiveConf will use that to override its 
default values.
 // 2: we set all spark confs to this hiveConf.
 // 3: we set all entries in config to this hiveConf.
-(hadoopConf.iterator().asScala.map(kv => kv.getKey -> kv.getValue)
-  ++ sparkConf.getAll.toMap ++ extraConfig).foreach { case (k, v) =>
+(hadoopConfMap ++ sparkConf.getAll.toMap ++ extraConfig).foreach { 
case (k, v) =>
   logDebug(
 s"""
|Applying Hadoop/Hive/Spark and extra properties to Hive Conf:
@@ -847,6 +847,11 @@ private[hive] class HiveClientImpl(
 }

 private[hive] object HiveClientImpl {
+
+  // wider signature for hadoop conf for different versions blabla ..
+  // See SPARK-17088.
+  private type HadoopConfiguration = JIterable[JMap.Entry[String, String]]
+
   /** Converts the native StructField to Hive's FieldSchema. */
   def toHiveColumn(c: StructField): FieldSchema = {
 val typeString = if (c.metadata.contains(HIVE_TYPE_STRING)) {
```

I think this could roughly address all concerns listed here.



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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[vanzin]

Github user vanzin commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r164035915
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/IsolatedClientLoader.scala
 ---
@@ -251,10 +251,8 @@ private[hive] class IsolatedClientLoader(
 
   /** The isolated client interface to Hive. */
   private[hive] def createClient(): HiveClient = synchronized {
-val warehouseDir = 
Option(hadoopConf.get(ConfVars.METASTOREWAREHOUSE.varname))
 if (!isolationOn) {
-  return new HiveClientImpl(version, warehouseDir, sparkConf, 
hadoopConf, config,
-baseClassLoader, this)
+  return new HiveClientImpl(version, sparkConf, hadoopConf, config, 
baseClassLoader, this)
--- End diff --

I'm sure that when people think about non-trivial code in Spark, this is 
exactly the line in the whole code base they think of... :-/


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[cloud-fan]

Github user cloud-fan commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r164032685
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/IsolatedClientLoader.scala
 ---
@@ -251,10 +251,8 @@ private[hive] class IsolatedClientLoader(
 
   /** The isolated client interface to Hive. */
   private[hive] def createClient(): HiveClient = synchronized {
-val warehouseDir = 
Option(hadoopConf.get(ConfVars.METASTOREWAREHOUSE.varname))
 if (!isolationOn) {
-  return new HiveClientImpl(version, warehouseDir, sparkConf, 
hadoopConf, config,
-baseClassLoader, this)
+  return new HiveClientImpl(version, sparkConf, hadoopConf, config, 
baseClassLoader, this)
--- End diff --

I think many people may get confused when they see this 
`JIterable[JMap.Entry[String, String]]` and the extra `warehouse` parameter. I 
don't agree that we can sacrifices code quality because it's only called twice.

So the argument is, is this wrapper solution cleaner than the current one? 
If it is, and can fix the issue, let's go for it.

I think refactoring should be encouraged, it happens a lot in the spark 
code base, people see hacky code and people fix it.


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[gatorsmile]

Github user gatorsmile commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r163938641
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/IsolatedClientLoader.scala
 ---
@@ -251,10 +251,8 @@ private[hive] class IsolatedClientLoader(
 
   /** The isolated client interface to Hive. */
   private[hive] def createClient(): HiveClient = synchronized {
-val warehouseDir = 
Option(hadoopConf.get(ConfVars.METASTOREWAREHOUSE.varname))
 if (!isolationOn) {
-  return new HiveClientImpl(version, warehouseDir, sparkConf, 
hadoopConf, config,
-baseClassLoader, this)
+  return new HiveClientImpl(version, sparkConf, hadoopConf, config, 
baseClassLoader, this)
--- End diff --

This is just a general rule we follow when we developing the software, 
especially when this does not affect the performance.


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[vanzin]

Github user vanzin commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r163936822
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/IsolatedClientLoader.scala
 ---
@@ -251,10 +251,8 @@ private[hive] class IsolatedClientLoader(
 
   /** The isolated client interface to Hive. */
   private[hive] def createClient(): HiveClient = synchronized {
-val warehouseDir = 
Option(hadoopConf.get(ConfVars.METASTOREWAREHOUSE.varname))
 if (!isolationOn) {
-  return new HiveClientImpl(version, warehouseDir, sparkConf, 
hadoopConf, config,
-baseClassLoader, this)
+  return new HiveClientImpl(version, sparkConf, hadoopConf, config, 
baseClassLoader, this)
--- End diff --

That's such a subjective argument. The extra argument does not make the 
code more complicated, especially compared to anything else going on here.


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[gatorsmile]

Github user gatorsmile commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r163936367
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/IsolatedClientLoader.scala
 ---
@@ -251,10 +251,8 @@ private[hive] class IsolatedClientLoader(
 
   /** The isolated client interface to Hive. */
   private[hive] def createClient(): HiveClient = synchronized {
-val warehouseDir = 
Option(hadoopConf.get(ConfVars.METASTOREWAREHOUSE.varname))
 if (!isolationOn) {
-  return new HiveClientImpl(version, warehouseDir, sparkConf, 
hadoopConf, config,
-baseClassLoader, this)
+  return new HiveClientImpl(version, sparkConf, hadoopConf, config, 
baseClassLoader, this)
--- End diff --

This is not the hot path. Passing extra parameters for this looks 
unnecessary. We need to keep the interface clean for better code maintenance. 


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[vanzin]

Github user vanzin commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r163920410
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/IsolatedClientLoader.scala
 ---
@@ -251,10 +251,8 @@ private[hive] class IsolatedClientLoader(
 
   /** The isolated client interface to Hive. */
   private[hive] def createClient(): HiveClient = synchronized {
-val warehouseDir = 
Option(hadoopConf.get(ConfVars.METASTOREWAREHOUSE.varname))
 if (!isolationOn) {
-  return new HiveClientImpl(version, warehouseDir, sparkConf, 
hadoopConf, config,
-baseClassLoader, this)
+  return new HiveClientImpl(version, sparkConf, hadoopConf, config, 
baseClassLoader, this)
--- End diff --

Let me ask the question: what exactly is the problem with the argument I 
added? It solves the issue without having to write all this code.

If you really dislike the argument for some odd reason, you can get the 
config by iterating over the `Iterable` in `HiveClientImpl`, making an 
operation that is currently O(1) to be O(n).

But I really don't understand why you guys care about this argument so 
much. There are *2* call sites to that constructor in the whole code base, both 
in the same method in `IsolatedClientLoader.scala`.


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[cloud-fan]

Github user cloud-fan commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r163774967
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/IsolatedClientLoader.scala
 ---
@@ -251,10 +251,8 @@ private[hive] class IsolatedClientLoader(
 
   /** The isolated client interface to Hive. */
   private[hive] def createClient(): HiveClient = synchronized {
-val warehouseDir = 
Option(hadoopConf.get(ConfVars.METASTOREWAREHOUSE.varname))
 if (!isolationOn) {
-  return new HiveClientImpl(version, warehouseDir, sparkConf, 
hadoopConf, config,
-baseClassLoader, this)
+  return new HiveClientImpl(version, sparkConf, hadoopConf, config, 
baseClassLoader, this)
--- End diff --

cc @vanzin 


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[cloud-fan]

Github user cloud-fan commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r163774842
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/IsolatedClientLoader.scala
 ---
@@ -251,10 +251,8 @@ private[hive] class IsolatedClientLoader(
 
   /** The isolated client interface to Hive. */
   private[hive] def createClient(): HiveClient = synchronized {
-val warehouseDir = 
Option(hadoopConf.get(ConfVars.METASTOREWAREHOUSE.varname))
 if (!isolationOn) {
-  return new HiveClientImpl(version, warehouseDir, sparkConf, 
hadoopConf, config,
-baseClassLoader, this)
+  return new HiveClientImpl(version, sparkConf, hadoopConf, config, 
baseClassLoader, this)
--- End diff --

so the major concern is to hide the `Configuration` class through the code 
path. How about we create a wrapper?
```
trait HadoopConfWrapper {
  def get(key: String): String
  def toIterator: Iterator[(String, String)]
}
```

and here
```
val wrapper = new HadoopConfWrapper {
  def get(key: String) = hadoopConf.get(key)

  def toIterator = hadoopConf.iterator().asScala
}
```


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[srowen]

Github user srowen commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r163655221
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala 
---
@@ -132,7 +131,8 @@ private[hive] class HiveClientImpl(
   if (ret != null) {
 // hive.metastore.warehouse.dir is determined in SharedState after 
the CliSessionState
 // instance constructed, we need to follow that change here.
-warehouseDir.foreach { dir =>
+val conf = hadoopConf.asInstanceOf[Configuration]
--- End diff --

Over heeerre ... you could say this is a good example of why getting 
reviews is important!


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[vanzin]

Github user vanzin commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r163631446
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala 
---
@@ -132,7 +131,8 @@ private[hive] class HiveClientImpl(
   if (ret != null) {
 // hive.metastore.warehouse.dir is determined in SharedState after 
the CliSessionState
 // instance constructed, we need to follow that change here.
-warehouseDir.foreach { dir =>
+val conf = hadoopConf.asInstanceOf[Configuration]
--- End diff --

Actually I'm not sure just what I suggested will work. You need to 
reproduce the condition to trigger the `if` above:

```
   val ret = SessionState.get
if (ret != null) {  if (ret != null) {
```

And I'm not sure how to do that. I'm just sure that if you do, your code 
will not work.


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[gatorsmile]

Github user gatorsmile commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r163630721
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala 
---
@@ -132,7 +131,8 @@ private[hive] class HiveClientImpl(
   if (ret != null) {
 // hive.metastore.warehouse.dir is determined in SharedState after 
the CliSessionState
 // instance constructed, we need to follow that change here.
-warehouseDir.foreach { dir =>
+val conf = hadoopConf.asInstanceOf[Configuration]
--- End diff --

Thanks! Will try to reproduce it.


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[vanzin]

Github user vanzin commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r163628671
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala 
---
@@ -132,7 +131,8 @@ private[hive] class HiveClientImpl(
   if (ret != null) {
 // hive.metastore.warehouse.dir is determined in SharedState after 
the CliSessionState
 // instance constructed, we need to follow that change here.
-warehouseDir.foreach { dir =>
+val conf = hadoopConf.asInstanceOf[Configuration]
--- End diff --

See other comment.


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[gatorsmile]

Github user gatorsmile commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r163627927
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala 
---
@@ -132,7 +131,8 @@ private[hive] class HiveClientImpl(
   if (ret != null) {
 // hive.metastore.warehouse.dir is determined in SharedState after 
the CliSessionState
 // instance constructed, we need to follow that change here.
-warehouseDir.foreach { dir =>
+val conf = hadoopConf.asInstanceOf[Configuration]
--- End diff --

How to reproduce it?


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[vanzin]

Github user vanzin commented on a diff in the pull request:

https://github.com/apache/spark/pull/20377#discussion_r163627455
  
--- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala 
---
@@ -132,7 +131,8 @@ private[hive] class HiveClientImpl(
   if (ret != null) {
 // hive.metastore.warehouse.dir is determined in SharedState after 
the CliSessionState
 // instance constructed, we need to follow that change here.
-warehouseDir.foreach { dir =>
+val conf = hadoopConf.asInstanceOf[Configuration]
--- End diff --

You're reintroducing the original bug here. You cannot cast this to 
`Configuration`, because in the `sharesHadoopClasses = false` case, there are 
two different instances of that class involved, and this will fail with a 
`ClassCastException`.


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[GitHub] spark pull request #20377: [SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasse...

[gatorsmile]

GitHub user gatorsmile opened a pull request:

https://github.com/apache/spark/pull/20377

[SPARK-17088] [FOLLOW-UP] Fix 'sharesHadoopClasses' option when creating 
client

## What changes were proposed in this pull request?
This PR is to remove useless  `warehouseDir`, which is already contained in 
`hadoopConf `

## How was this patch tested?
N/A

You can merge this pull request into a Git repository by running:

$ git pull https://github.com/gatorsmile/spark followUp17088

Alternatively you can review and apply these changes as the patch at:

https://github.com/apache/spark/pull/20377.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 #20377


commit 0574ec71d830d8c4b5acdbfc910ddc0f5622b0ed
Author: gatorsmile 
Date:   2018-01-24T05:05:47Z

remove warehousePath




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