[jira] [Commented] (ARROW-6500) [Java] How to use RootAllocator in a low memory setting?

["Wes McKinney (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-6500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16926734#comment-16926734 ] 

Wes McKinney commented on ARROW-6500:
-------------------------------------

You might bring this up on dev@

> [Java] How to use RootAllocator in a low memory setting?
> --------------------------------------------------------
>
>                 Key: ARROW-6500
>                 URL: https://issues.apache.org/jira/browse/ARROW-6500
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Java
>    Affects Versions: 0.13.0
>            Reporter: Andong Zhan
>            Priority: Major
>
> When I run this simple code with JVM setting: "-Xmx64m"
> {code:java}
> package com.snowflake;
> import org.apache.arrow.memory.RootAllocator;
> public class TestArrow
> {
>   public static void main(String args[]) throws Exception
>   {
>     new RootAllocator(Integer.MAX_VALUE);
>   }
> }
> {code}
> and got the following error
> {code:java}
> Picked up JAVA_TOOL_OPTIONS: -Djavax.net.ssl.trustStore=/etc/pki/ca-trust/extracted/java/cacerts
> Exception in thread "main" java.lang.ExceptionInInitializerError 
> at org.apache.arrow.memory.BaseAllocator.createEmpty(BaseAllocator.java:263) 
> at org.apache.arrow.memory.BaseAllocator.<init>(BaseAllocator.java:89) 
> at org.apache.arrow.memory.RootAllocator.<init>(RootAllocator.java:34) 
> at org.apache.arrow.memory.RootAllocator.<init>(RootAllocator.java:30) 
> at com.snowflake.TestArrow.main(TestArrow.java:13)
> Caused by: java.lang.NullPointerException 
> at io.netty.buffer.PooledByteBufAllocatorL$InnerAllocator.<init>(PooledByteBufAllocatorL.java:145) 
> at io.netty.buffer.PooledByteBufAllocatorL.<init>(PooledByteBufAllocatorL.java:49) 
> at org.apache.arrow.memory.AllocationManager.<clinit>(AllocationManager.java:61) ... 5 more
> Process finished with exit code 1
> {code}
> So how to use RootAllocator in such low memory case?



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