[jira] [Comment Edited] (FLINK-24302) Direct buffer memory leak on Pulsar connector with Java 11

["Chesnay Schepler (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-24302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17575197#comment-17575197 ] 

Chesnay Schepler edited comment on FLINK-24302 at 8/4/22 10:29 AM:
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There is no release yet with the new APIs for controlling the memory consumption of consumers; it's only available for producers afaict.

[https://github.com/apache/pulsar/commit/7b2d4c1cccc377607697dcc562b6c85eb447e0af]

[https://github.com/apache/pulsar/commit/1a098d5418be7d4674f9ba9dbc4da0018f91654a]


was (Author: zentol):
There is no release yet with the new APis for controlling the memory consumption of consumers; it's only available for producers afaict.

https://github.com/apache/pulsar/commit/7b2d4c1cccc377607697dcc562b6c85eb447e0af

https://github.com/apache/pulsar/commit/1a098d5418be7d4674f9ba9dbc4da0018f91654a

> Direct buffer memory leak on Pulsar connector with Java 11
> ----------------------------------------------------------
>
>                 Key: FLINK-24302
>                 URL: https://issues.apache.org/jira/browse/FLINK-24302
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Connectors / Pulsar
>    Affects Versions: 1.14.0
>            Reporter: Yufan Sheng
>            Priority: Major
>              Labels: test-stability
>
> Running the Pulsar connector with multiple split readers on Java 11 could throw {{a java.lang.OutOfMemoryError exception}}.
>  
> {code:java}
> Caused by: java.util.concurrent.CompletionException: org.apache.pulsar.client.admin.internal.http.AsyncHttpConnector$RetryException: Could not complete the operation. Number of retries has been exhausted. Failed reason: java.lang.OutOfMemoryError: Direct buffer memory
> 	at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:331)
> 	at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:346)
> 	at java.base/java.util.concurrent.CompletableFuture$OrApply.tryFire(CompletableFuture.java:1503)
> 	... 42 more
> Caused by: org.apache.pulsar.client.admin.internal.http.AsyncHttpConnector$RetryException: Could not complete the operation. Number of retries has been exhausted. Failed reason: java.lang.OutOfMemoryError: Direct buffer memory
> 	at org.apache.pulsar.client.admin.internal.http.AsyncHttpConnector.lambda$retryOperation$4(AsyncHttpConnector.java:249)
> 	... 39 more
> Caused by: org.apache.pulsar.shade.io.netty.handler.codec.EncoderException: java.lang.OutOfMemoryError: Direct buffer memory
> 	at org.apache.pulsar.shade.io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:104)
> 	at org.apache.pulsar.shade.io.netty.channel.CombinedChannelDuplexHandler.write(CombinedChannelDuplexHandler.java:346)
> 	at org.apache.pulsar.shade.io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717)
> 	at org.apache.pulsar.shade.io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:709)
> 	at org.apache.pulsar.shade.io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:792)
> 	at org.apache.pulsar.shade.io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:702)
> 	at org.apache.pulsar.shade.io.netty.handler.stream.ChunkedWriteHandler.doFlush(ChunkedWriteHandler.java:303)
> 	at org.apache.pulsar.shade.io.netty.handler.stream.ChunkedWriteHandler.flush(ChunkedWriteHandler.java:132)
> 	at org.apache.pulsar.shade.io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:750)
> 	at org.apache.pulsar.shade.io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:765)
> 	at org.apache.pulsar.shade.io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:790)
> 	at org.apache.pulsar.shade.io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:758)
> 	at org.apache.pulsar.shade.io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1020)
> 	at org.apache.pulsar.shade.io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:311)
> 	at org.apache.pulsar.shade.org.asynchttpclient.netty.request.NettyRequestSender.writeRequest(NettyRequestSender.java:420)
> 	... 23 more
> {code}
> The reason is that under Java 11, the Netty will allocate memory from the pool of Java Direct Memory and is affected by the MaxDirectMemory limit. Under Java 8, it allocates native memory and is not affected by that setting.
> We have to reduce the direct memory usage by using a newer Pulsar client which has a memory-limits configuration.
> This issue is addressed on Pulsar, and [PIP-74|https://github.com/apache/pulsar/wiki/PIP-74%3A-Pulsar-client-memory-limits] has been created for resolving this issue.
> We should keep this issue open with no resolved versions until Pulsar provides a new client with memory limits.



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