Arsnael commented on PR #1648:
URL: https://github.com/apache/james-project/pull/1648#issuecomment-1644901533

   > ```
   > Exception in thread "OpenSearch-driver-3" java.lang.OutOfMemoryError: Java 
heap space
   >    at 
org.apache.hc.core5.util.ByteArrayBuffer.<init>(ByteArrayBuffer.java:54)
   >    at 
org.opensearch.client.transport.httpclient5.internal.HeapBufferedAsyncEntityConsumer.data(HeapBufferedAsyncEntityConsumer.java:91)
   >    at 
org.apache.hc.core5.http.nio.entity.AbstractBinDataConsumer.consume(AbstractBinDataConsumer.java:75)
   >    at 
org.apache.hc.core5.http.nio.support.AbstractAsyncResponseConsumer.consume(AbstractAsyncResponseConsumer.java:141)
   >    at 
org.apache.hc.client5.http.impl.async.HttpAsyncMainClientExec$1.consume(HttpAsyncMainClientExec.java:227)
   >    at 
org.apache.hc.core5.http.impl.nio.ClientHttp1StreamHandler.consumeData(ClientHttp1StreamHandler.java:265)
   >    at 
org.apache.hc.core5.http.impl.nio.ClientHttp1StreamDuplexer.consumeData(ClientHttp1StreamDuplexer.java:354)
   >    at 
org.apache.hc.core5.http.impl.nio.AbstractHttp1StreamDuplexer.onInput(AbstractHttp1StreamDuplexer.java:325)
   >    at 
org.apache.hc.core5.http.impl.nio.AbstractHttp1IOEventHandler.inputReady(AbstractHttp1IOEventHandler.java:64)
   >    at 
org.apache.hc.core5.http.impl.nio.ClientHttp1IOEventHandler.inputReady(ClientHttp1IOEventHandler.java:41)
   >    at 
org.apache.hc.core5.reactor.InternalDataChannel.onIOEvent(InternalDataChannel.java:133)
   >    at 
org.apache.hc.core5.reactor.InternalChannel.handleIOEvent(InternalChannel.java:51)
   >    at 
org.apache.hc.core5.reactor.SingleCoreIOReactor.processEvents(SingleCoreIOReactor.java:178)
   >    at 
org.apache.hc.core5.reactor.SingleCoreIOReactor.doExecute(SingleCoreIOReactor.java:127)
   >    at 
org.apache.hc.core5.reactor.AbstractSingleCoreIOReactor.execute(AbstractSingleCoreIOReactor.java:85)
   >    at 
org.apache.hc.core5.reactor.IOReactorWorker.run(IOReactorWorker.java:44)
   >    at java.base/java.lang.Thread.run(Thread.java:829)
   > ```
   > 
   > Likely related, and a nice problem to debug!
   > 
   > At your flame graphs / visualvm dumps!
   
   I guessed with what I saw with perf tests yesterday... I had 9000+ users 
(10k users total) hanging at the end of the imap simulation...
   
   I wanted to do some dumps and graphs today but well... can't access the perf 
test VM for now


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