Alexander Veit created SOLR-17376:
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Summary: Direct buffer memory leak in Solr Java Client
Key: SOLR-17376
URL: https://issues.apache.org/jira/browse/SOLR-17376
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: clients - java, http2
Affects Versions: 9.6.1
Environment: Java version: 21.0.3+9-LTS
Windows Server 2019
Reporter: Alexander Veit
Attachments: image-2024-07-23-14-38-17-254.png
We use the Solr Java client in a log-running service to update documents in an
index. As it turns out the Solr client allocates direct buffers that accumulate
and never get released until JVM restart. After some hundreds of thousands
instances of java.nio.DirectByteBuffer haven been created the system gets stuck
and OutOfMemoryErrors occur inside the JVM. Unfortunately the JVM does not
terminate itself, probably because this is not an issue of Java heap memory.
Therefore the service could not be restarted automatically but requires user
interaction.
Although we have a rather complex scenario, we can almost certainly rule out
that the leak is due to missing close() calls on the SolrClient instances
within the JVM. SolrClients are generally reused during the lifetime of the JVM.
The Solr client was created like in the following code
{code:java}
SolrClient client = new Http2SolrClient.Builder("my-url").build();{code}
The Solr requests were made like in the following code
{code:java}
QueryRequest request = new QueryRequest(params);
request.process(client, "my-collection");{code}
A heap dump taken from an affected JVM showed the following instance counts:
{noformat}
org.apache.solr.client.solrj.impl.Http2SolrClient 2
org.eclipse.jetty.io.LogarithmicArrayByteBufferPool 1
org.eclipse.jetty.io.MappedByteBufferPool 2
java.nio.DirectByteBuffer 458485{noformat}
The DirectByteBuffers seem to be held alive by a thread-local map.
!image-2024-07-23-14-38-17-254.png!
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