ARROW-7610: [Java] Finish support for 64 bit int allocations #6323

liyafan82 · 2020-01-30T08:17:23Z

Modified the NettyAllocationManager to allow for 64 bit allocations. If the requested size is > Int.MAX_VALUE, memory will be allocated using PlatformDependent.allocateMemory(long) otherwise the existing allocation method remains unchanged.

Unit tests were added that uses a custom AllocationManager with a smaller cutoff value to be able to test the new functionality within our current CI memory limits. Additional tests were added that allocate large buffers, but are required to run manually.

liyafan82 · 2020-01-30T08:23:55Z

Some limitations of this PR:

We do not support large buffers in varchar and var binary vectors, as the offset width is fixed at 4. (I have noticed that ARROW-6111 has been opened to track this, and I would like to help if necessary).
We do not support E2E sending/receiving large buffers through IPC. This is because the current Flight implementation is relying on data structurs which are based on 32-bit integers (e.g. NettyArrowBuf#length and ByteArrayOutputStream#count are both based on int32). Fixing this may require non-trivial effort, and we may do it in another issue (if this is needed).

github-actions · 2020-01-30T08:31:40Z

https://issues.apache.org/jira/browse/ARROW-7610

emkornfield · 2020-02-03T04:16:43Z

@liyafan82 I removed myself as assignee for ARROW-6111 feel free to pick it up if you have time.

emkornfield · 2020-02-03T04:19:58Z

java/vector/src/main/java/org/apache/arrow/vector/UInt2Vector.java

would it be simpler to make TYPE_WIDTH long for here an other places? Are there downsides to that?

Making it a long is a reasonable choice.
I am not sure if is an overkill as TYPE_WIDTH is often a small number, and often used in scenarios where a small number is expected.

@emkornfield After more thoughts, I kind of prefer leaving the offset width int32. This makes sure we promote the related operations to int64 only when necessary.

That being said, I will follow your advice and make the offset width int 64, if you have a reason, or feel strong about it.

sounds ok to me.

emkornfield · 2020-02-03T04:20:19Z

java/vector/src/test/java/org/apache/arrow/vector/TestLargeVector.java

Suggested change

* the data buffer..

* the data buffer.

Nice catch. Thank you.

emkornfield · 2020-02-03T04:23:32Z

java/memory/src/main/java/org/apache/arrow/memory/DefaultAllocationManagerOption.java

@jacques-n thoughts on making the default Unsafe to avoid any dependencies on Netty?

@emkornfield I have changed the code to make the default unsafe, so that we support large buffers by default.

emkornfield · 2020-02-03T04:25:02Z

@liyafan82 can you elaborate on how flight impacts the normal IPC format? (perhaps a follow-up JIRA explaining it?)

liyafan82 · 2020-02-03T06:58:20Z

@liyafan82 I removed myself as assignee for ARROW-6111 feel free to pick it up if you have time.

Sure. I will try to proivide an implementation.

liyafan82 · 2020-02-03T07:02:09Z

@liyafan82 can you elaborate on how flight impacts the normal IPC format? (perhaps a follow-up JIRA explaining it?)

Sure. I will open a JIRA tracking it.

emkornfield · 2020-02-24T05:57:32Z

@liyafan82 can you elaborate on how flight impacts the normal IPC format? (perhaps a follow-up JIRA explaining it?)

Sure. I will open a JIRA tracking it.

Did you get a chance, I'd like to understand what is left?

liyafan82 · 2020-02-24T06:21:25Z

@liyafan82 can you elaborate on how flight impacts the normal IPC format? (perhaps a follow-up JIRA explaining it?)

Sure. I will open a JIRA tracking it.

Did you get a chance, I'd like to understand what is left?

Sure. I opened https://issues.apache.org/jira/browse/ARROW-7746 to track it.
If the description is not clear enough, please let me know, and I will revise it.
The general idea is that some internal data structures are based on int32, so if the buffer size exceeds 2GB, an integer overflow will happen.

liyafan82 · 2020-04-03T02:18:06Z

@emkornfield Could you please triage this PR to a committer, as it is blocking another issue (#6782 (comment))?

emkornfield · 2020-04-04T02:38:20Z

java/memory/src/main/java/org/apache/arrow/memory/DefaultAllocationManagerOption.java

Warn might be too high, I think info is probably more appropriate.

Revised to info. Thank you.

emkornfield · 2020-04-04T02:46:07Z

java/memory/src/main/java/org/apache/arrow/memory/DefaultAllocationManagerOption.java

it seems like these should match up with the enums exactly? or probably do an non case sensitive comparison.

Sounds good. Revised the code to match up with the enum exactly. Thank you.

emkornfield · 2020-04-04T02:48:49Z

A couple of small comments. Sorry to flip-flop but lets keep the default allocator as Netty and then change it in the next release, when some of the other Memory PRs have been committed? Can you also add details on how to configure the new allocator to the PR description so it gets put into release notes (we should also make sure to make note of this).

liyafan82 · 2020-04-06T04:36:36Z

Thanks a lot for your effort.

A couple of small comments. Sorry to flip-flop but lets keep the default allocator as Netty and then change it in the next release, when some of the other Memory PRs have been committed?

Sounds good. The default allocator is reverted to Netty.

Can you also add details on how to configure the new allocator to the PR description so it gets put into release notes (we should also make sure to make note of this).

Good suggestion. I have added details to the description. Thank you.

emkornfield

Two comments around logging. I would like to make sure we aren't going to cause problems for users of the library by ignoring log configuration since we are logging in a static initializer. The other is a small nit. I think this can be merged after we resolve those.

emkornfield · 2020-04-07T04:54:45Z

java/memory/src/main/java/org/apache/arrow/memory/DefaultAllocationManagerOption.java

what happens when logging during static initialization?

If I understand your question correctly. You are concerned that when calling getDefaultAllocationManagerFactory, the logger may not have been initialized. If so, a NullPoinerException will be thrown.

There is no need to worry about that. According to the Java specification (https://docs.oracle.com/javase/specs/jls/se7/html/jls-12.html#jls-12.4.2), static members in a class are initialized in textual order, as though they were a single block.

In our code, initialization of the logger appears before the DEFAULT_ALLOCATION_MANAGER_FACTORY, so it always gets initialized first.

In fact, this code path has been tested by all our test cases, as by default, no environmental variable or system property are specified when running the tests.

emkornfield · 2020-04-07T04:55:21Z

java/memory/src/main/java/org/apache/arrow/memory/DefaultAllocationManagerOption.java

nit: LOGGER seems to be more common in the code base.

Sounds good. Revised. Thank you.

liyafan82 · 2020-04-07T09:27:10Z

Two comments around logging. I would like to make sure we aren't going to cause problems for users of the library by ignoring log configuration since we are logging in a static initializer. The other is a small nit. I think this can be merged after we resolve those.

Thanks a lot for your comments. Please see if I understand your question correctly.

BryanCutler · 2020-04-10T20:22:22Z

@liyafan82 I don't really see an answer to the question @jacques-n asked on the JIRA and mailing list:

Per comments on the mailing list,
I think we should use the existing netty facades for this.
PlatformDependent.allocateMemory(long)
PlatformDependent.freeMemory(long)
These delegate to unsafe which also ensures that -XX:MaxDirectMemorySize is respected.
I don't think we need a new allocator. We can simply check the size and use this path if beyond an int in size within the existing allocator.

I agree with this that it is overkill to introduce different types of allocators if it can be handled with minimal changes to the current Netty based allocator. What are yours and @emkornfield thoughts on taking this approach?

emkornfield · 2020-04-10T22:46:09Z

I thought I replied on the mailing list to this but it would be nice to get rid of a hard dependency on netty for two reasons:

Netty Version conflicts when consuming arrow
Setting the netty specific system parameter for later versions

There are other jiras which are also trying to trim the dependency on netty

emkornfield · 2020-04-10T23:12:59Z

Are there benefits to going through the netty facade/existing implementation?

liyafan82 · 2020-04-11T14:32:48Z

@liyafan82 I don't really see an answer to the question @jacques-n asked on the JIRA and mailing list:

Per comments on the mailing list,
I think we should use the existing netty facades for this.
PlatformDependent.allocateMemory(long)
PlatformDependent.freeMemory(long)
These delegate to unsafe which also ensures that -XX:MaxDirectMemorySize is respected.
I don't think we need a new allocator. We can simply check the size and use this path if beyond an int in size within the existing allocator.

I agree with this that it is overkill to introduce different types of allocators if it can be handled with minimal changes to the current Netty based allocator. What are yours and @emkornfield thoughts on taking this approach?

@BryanCutler Thanks for your attention.
As @emkornfield suggested, we are trying to remove netty dependencies from the core of Arrow (Please see ARROW-4526 for details). A number of attempts are being made to separate netty and arrow implementations, and we want to finally move netty related stuffs to a separate module.

liyafan82 · 2020-04-11T14:34:43Z

Are there benefits to going through the netty facade/existing implementation?

One that comes to my mind is backward compatiblity?

BryanCutler · 2020-04-15T18:09:34Z

I'm all for removing dependencies on Netty, but that doesn't have to be done here. This could be done a lot easier by using the existing NettyAllocationManager instead of creating a new one, plus that also gives the benefit of using the default allocator that can also make large allocations. Adding an alternative allocation manager to Netty should probably be done as a separate issue with it's own discussion.

emkornfield · 2020-04-15T20:40:04Z

I'm all for removing dependencies on Netty, but that doesn't have to be done here. This could be done a lot easier by using the existing NettyAllocationManager instead of creating a new one, plus that also gives the benefit of using the default allocator that can also make large allocations. Adding an alternative allocation manager to Netty should probably be done as a separate issue with it's own discussion.

I'm OK with this. @liyafan82 I think it is probably easy to move the new allocator and selection code to a different PR and make the changes directly to the netty allocator in this PR? Does that sound reasonable to you?

liyafan82 · 2020-04-16T04:40:13Z

I'm all for removing dependencies on Netty, but that doesn't have to be done here. This could be done a lot easier by using the existing NettyAllocationManager instead of creating a new one, plus that also gives the benefit of using the default allocator that can also make large allocations. Adding an alternative allocation manager to Netty should probably be done as a separate issue with it's own discussion.

I'm OK with this. @liyafan82 I think it is probably easy to move the new allocator and selection code to a different PR and make the changes directly to the netty allocator in this PR? Does that sound reasonable to you?

@emkornfield Sounds reasonable to me. Thanks for the good suggestion @BryanCutler
I will revise the code accordingly.

liyafan82 · 2020-04-16T10:28:03Z

@BryanCutler @emkornfield
I have revised the code for NettyAllocationManager to make it support allocating large buffers in this PR.
Another separate issue (ARROW-8481) is opened for the UnsafeAllocationManager.

Please take a look. Thanks again for the good suggestion.

BryanCutler · 2020-04-20T16:21:08Z

java/memory/src/main/java/org/apache/arrow/memory/NettyAllocationManager.java


-  NettyAllocationManager(BaseAllocator accountingAllocator, int requestedSize) {
-    super(accountingAllocator);
-    this.memoryChunk = INNER_ALLOCATOR.allocate(requestedSize);


I don't think we should remove this which effectively replaces all allocations done in Arrow Java, which is a big change. INNER_ALLOCATOR also uses a pool which has some benefits. Instead, can you just change requestedSize to be a long, then check if it is over the max Int size and only then use PlatformDependent.allocateMemory?

Revised. Thank you for the good suggestion.

BryanCutler · 2020-04-20T16:21:51Z

java/memory/src/test/java/org/apache/arrow/memory/TestLargeArrowBuf.java

+ * To run this test, please
+ *<li>Make sure there are 4GB memory available in the system.</li>
+ * <li>
+ *   Make sure the default allocation manager type is unsafe.


please update

Nice catch. Thank you.

BryanCutler · 2020-04-20T16:22:19Z

java/memory/src/test/java/org/apache/arrow/memory/TestLargeArrowBuf.java

+    System.out.println("Successfully released the large buffer.");
+  }
+
+  public static void main(String[] args) {


Can this be converted to a standard unit test now?

Sounds good to me.
The problem is that we set arrow.vector.max_allocation_bytes to 1048576 for every test case (to avoid OOM). Please see the pom.xml file.

So if we convert it to a test case, we cannot allocate too much memory.

What do you think about adding an additional constructor for NettyAllocationManager that also takes a cut-off value that will determine if PlatformDependent.allocateMemory(requestedSize) is used with a default of Int.MAX_VALUE? Then you could create a new NettyAllocationManager for testing with a small cut-off value that can be used to run normal tests.

Sounds good.
I have revised the code to make the cut-off value configurable, and added cases to test the scenarios when the request size is below/above the cut-off value. Please see if it looks good to you. Thanks.

So this is not run as part of the normal test suite correct? Does it need to run manually? if so could you put that in the javadoc

Yes, it needs to run manually.
I have updated the javadoc accordingly.

BryanCutler · 2020-04-20T16:25:46Z

java/vector/src/test/java/org/apache/arrow/vector/TestLargeVector.java

+ * To run this test, please
+ *<li>Make sure there are 4GB memory available in the system.</li>
+ * <li>
+ *   Make sure the default allocation manager type is unsafe.


Revised. Thank you.

BryanCutler · 2020-04-20T16:26:09Z

java/vector/src/test/java/org/apache/arrow/vector/TestLargeVector.java

+    System.out.println("Successfully released the large vector.");
+  }
+
+  public static void main(String[] args) {


same here about making these standard unit tests

As discussed above, if we make it a unit test, we cannot allocate too much memory.

…rategy

BryanCutler · 2020-04-23T20:59:04Z

java/memory/src/main/java/org/apache/arrow/memory/NettyAllocationManager.java

-   * Get the underlying memory chunk managed by this AllocationManager.
-   * @return buffer
-   */
-  UnsafeDirectLittleEndian getMemoryChunk() {


instead of removing this, could you deprecate and note it will be removed in future releases? also note that it will return null if allocated size is more than max int.

Sounds good. Reverted this accordingly.

BryanCutler · 2020-04-23T21:00:25Z

java/memory/src/main/java/org/apache/arrow/memory/NettyAllocationManager.java

+      allocatedAddress = PlatformDependent.allocateMemory(requestedSize);
+    } else {
+      this.memoryChunk = INNER_ALLOCATOR.allocate(requestedSize);
+      allocatedAddress = memoryChunk.memoryAddress();


could you keep allocatedSize = memoryChunk.capacity() for this case?

Sure. Revised. Please check.

BryanCutler · 2020-04-23T21:00:44Z

java/memory/src/main/java/org/apache/arrow/memory/NettyAllocationManager.java

-  UnsafeDirectLittleEndian getMemoryChunk() {
-    return memoryChunk;
+    if (requestedSize > Integer.MAX_VALUE) {
+      memoryChunk = null;


use this.memoryChunk to be consistent

Revised accordingly. Thank you.

BryanCutler · 2020-04-23T21:46:40Z

java/memory/src/test/java/org/apache/arrow/memory/TestLargeArrowBuf.java

+    System.out.println("Successfully released the large buffer.");
+  }
+
+  public static void main(String[] args) {


What do you think about adding an additional constructor for NettyAllocationManager that also takes a cut-off value that will determine if PlatformDependent.allocateMemory(requestedSize) is used with a default of Int.MAX_VALUE? Then you could create a new NettyAllocationManager for testing with a small cut-off value that can be used to run normal tests.

BryanCutler · 2020-04-24T16:12:51Z

java/memory/src/main/java/org/apache/arrow/memory/NettyAllocationManager.java

+  /**
+   * The cut-off value for switching allocation strategies.
+   */
+  private final long allocationCutOffValue;


This should be an int because it can't go above Int.MAX_VALUE

Changed to int. Thanks for the good suggestion.

BryanCutler · 2020-04-24T16:14:20Z

java/memory/src/main/java/org/apache/arrow/memory/NettyAllocationManager.java

  @Override
  protected void release0() {
-    memoryChunk.release();
+    if (allocatedSize > allocationCutOffValue) {


just check if memoryChunk is null here

Revised accordingly. Thank you.

BryanCutler · 2020-04-24T16:17:11Z

java/memory/src/test/java/org/apache/arrow/memory/TestLargeArrowBuf.java

+    System.out.println("Successfully released the large buffer.");
+  }
+
+  public static void main(String[] args) {


So this is not run as part of the normal test suite correct? Does it need to run manually? if so could you put that in the javadoc

BryanCutler · 2020-04-24T16:20:04Z

java/memory/src/main/java/org/apache/arrow/memory/NettyAllocationManager.java

+    }
+    DEFAULT_ALLOCATION_CUTOFF_VALUE = cutOffValue;
+  }
+


none of this is necessary, please remove. you can create a custom NettyAllocationManager for tests and specify a different value there. See https://github.com/apache/arrow/blob/master/java/memory/src/test/java/org/apache/arrow/memory/TestBaseAllocator.java#L393

Removed. Thank you for the good suggestion.

BryanCutler · 2020-04-24T16:21:07Z

java/memory/src/main/java/org/apache/arrow/memory/NettyAllocationManager.java

+  @Deprecated
  UnsafeDirectLittleEndian getMemoryChunk() {
-    return memoryChunk;
+    return allocatedSize > allocationCutOffValue ? null : memoryChunk;


why add this? just return memoryChunk, it with either be null or a value

Sorry. This is not needed. Reverted.

BryanCutler · 2020-04-24T16:24:03Z

java/memory/src/test/java/org/apache/arrow/memory/TestNettyAllocationManager.java

+    final long bufSize = 2048L;
+    try (RootAllocator allocator = new RootAllocator(bufSize);
+         ArrowBuf buffer = allocator.buffer(bufSize)) {
+      // make sure the buffer is large enough, so we wil use the allocation strategy for large buffers


misspelled wil

Sorry about the typo. This comment is removed.

BryanCutler · 2020-04-24T16:28:10Z

java/memory/src/test/java/org/apache/arrow/memory/TestNettyAllocationManager.java

+   */
+  @Test
+  public void testLargeBufferAllocation() {
+    final long bufSize = 2048L;


how about set this to NettyAllocationManager.DEFAULT_ALLOCATION_CUTOFF_VALUE + someval

Sounds good. Revised accordingly.

BryanCutler

LGTM

BryanCutler · 2020-04-27T19:05:05Z

test failure is unrelated, merged to master. Thanks @liyafan82 !

liyafan82 · 2020-04-28T02:23:45Z

@BryanCutler @emkornfield Thanks a lot for your effort.

This is in response to the discussion in #6323 (comment) In this issue, we provide an allocation manager that is capable of allocation large (> 2GB) buffers. In addition, it does not depend on the netty library, which is aligning with the general trend of removing netty dependencies. In the future, we are going to make it the default allocation manager. Closes #6956 from liyafan82/fly_0416_unsf Lead-authored-by: liyafan82 <fan_li_ya@foxmail.com> Co-authored-by: emkornfield <emkornfield@gmail.com> Signed-off-by: Micah Kornfield <emkornfield@gmail.com>

This is in response to the discussion in apache/arrow#6323 (comment) In this issue, we provide an allocation manager that is capable of allocation large (> 2GB) buffers. In addition, it does not depend on the netty library, which is aligning with the general trend of removing netty dependencies. In the future, we are going to make it the default allocation manager. Closes #6956 from liyafan82/fly_0416_unsf Lead-authored-by: liyafan82 <fan_li_ya@foxmail.com> Co-authored-by: emkornfield <emkornfield@gmail.com> Signed-off-by: Micah Kornfield <emkornfield@gmail.com>

Modified the `NettyAllocationManager` to allow for 64 bit allocations. If the requested size is > `Int.MAX_VALUE`, memory will be allocated using `PlatformDependent.allocateMemory(long)` otherwise the existing allocation method remains unchanged. Unit tests were added that uses a custom AllocationManager with a smaller cutoff value to be able to test the new functionality within our current CI memory limits. Additional tests were added that allocate large buffers, but are required to run manually. Closes apache#6323 from liyafan82/fly_0123_alloc Authored-by: liyafan82 <fan_li_ya@foxmail.com> Signed-off-by: Bryan Cutler <cutlerb@gmail.com>

emkornfield reviewed Feb 3, 2020

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BryanCutler mentioned this pull request Apr 16, 2020

ARROW-6111: [Java] Support LargeVarChar and LargeBinary types #6425

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liyafan82 added 5 commits April 16, 2020 15:51

[ARROW-7610][Java] Finish support for 64 bit int allocations

56891b7

[ARROW-7610][Java] Use the unsafe allocator by default

6e2cafe

[ARROW-7610][Java] Resolve comments

da1a06a

[ARROW-7610][Java] Resolve log related problems

78b77a8

[ARROW-7610][Java] Revise netty allocator to support large buffers

6c0edf6

liyafan82 force-pushed the fly_0123_alloc branch from e1d9a26 to 6c0edf6 Compare April 16, 2020 09:22

liyafan82 mentioned this pull request Apr 16, 2020

ARROW-8481: [Java] Provide an allocation manager based on Unsafe API #6956

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[ARROW-7610][Java] Make netty allocation manager switch allocation st…

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…rategy

BryanCutler requested changes Apr 23, 2020

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[ARROW-7610][Java] Make allocation cut-off value configurable

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[ARROW-7610][Java] Resolve comments

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fsaintjacques added the Component: Java label Apr 27, 2020

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BryanCutler closed this in da0aa4d Apr 27, 2020

This was referenced Apr 28, 2020

[Java] Finish support for 64 bit int allocations #23863

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[Java] Provide an allocation manager based on Unsafe API #17139

Closed

ARROW-7610: [Java] Finish support for 64 bit int allocations #6323

ARROW-7610: [Java] Finish support for 64 bit int allocations #6323

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