[jira] [Issue Comment Deleted] (ARROW-198) OutOfMemoryError for vector test case

["Fangzhou (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Fangzhou updated ARROW-198:
---------------------------
    Comment: was deleted

(was: Just tried setting -XX:MaxDirectMemorySize to JVM and error can be solved. Make sure the value exceeds 2147483644 ,like 2148M)

> OutOfMemoryError for vector test case
> -------------------------------------
>
>                 Key: ARROW-198
>                 URL: https://issues.apache.org/jira/browse/ARROW-198
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Java - Memory, Java - Vectors
>            Reporter: Fangzhou
>            Priority: Minor
>
> When executing vector component  TestValueVector test cases(testVariableVectorReallocation,testFixedVectorReallocation),exception can be seen.
> Exception:
> java.lang.Exception: Unexpected exception, expected<org.apache.arrow.vector.util.OversizedAllocationException> but was<org.apache.arrow.memory.OutOfMemoryException>
> where the issue comes from:
> public void testFixedVectorReallocation() {
> ....
>  try {
>       vector.allocateNew(expectedValueCapacity);   <-- where the exception comes from
> ....
> analysis:
> allocateNew will invoke classes from io.netty.buffer from memory component and finally invoke netty third party package.I assume there is no issue when invoking  memory  part.Then I trace that the issue is caused by oversizing value of initialCapacity setting when invoking AbstractByteBufAllocator class in third party netty-buffer-4.0.27.final.jar. I create a test case which can reproduces the issue. value of parameter initialCapacity and maxCapacity are obtained from debugging procedure
> public void testAllocator(){
>                 int initialCapacity=2147483644;
> 		int maxCapacity=2147483647;
> 		ByteBuf buf = UnpooledByteBufAllocator.DEFAULT.directBuffer(initialCapacity, maxCapacity);
> }
> And I checked the rooted affected class java.nio.Bits:
> static void reserveMemory(long size, int cap) {
> .....
> if (totalCapacity + cap > maxMemory)
>     throw new OutOfMemoryError("Direct buffer memory");
> .....
> maxMemory can only be set to 1836056576 at most,but cap(initialCapacity) was 2147483644 at this moment.



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