Leakchecker

This project creates a java agent used for checking for certain memory leaks. Specifically it checks for new java.util.zip.Inflater with no following end() call which might indicate a native memory leak. The agent prints out potential new leaks every minute.

Building

make all

Running with test class

The test class is just a simple class that allocates Inflater and sleeps. It should print out that it found one leak, and the stacktrace for the allocation.

java -javaagent:agent/target/leakchecker-agent-1.0-SNAPSHOT.jar -jar agent/target/leakchecker-agent-1.0-SNAPSHOT.jar

Example output:

Potential leaks:
Total: 1
New:
java.lang.RuntimeException: Created: java.util.zip.Inflater@57d5872c
        at java.util.zip.Inflater.<init>(Unknown Source)
        at java.util.zip.Inflater.<init>(Unknown Source)
        at co.elastic.leakchecker.TestMain.main(TestMain.java:8)

Running with Elasticsearch

Copy the agent into the Elasticsearch install directory.

ES_JAVA_OPTS="-javaagent:leakchecker-agent-1.0-SNAPSHOT.jar" bin/elasticsearch

It will report some allocations during startup and plugin loading, which will stay allocated due to various caches. The important part is that it doesn't continue to increase over time.