[SUREFIRE-2072] Surefire retains too much heap in some case, leading to OutOfMemory

**[Mickael Istria](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=mickael.istria)** opened **[SUREFIRE-2072](https://issues.apache.org/jira/browse/SUREFIRE-2072?redirect=false)** and commented

Most likely since SuREFIRE-1845, every test execution can retain 64kB of RAM (as cache). Which caching is welcome, this cannot scale with some big test suites of several thousands of tests and cause OutOfMemoryError.

This is the case when running Eclipse JDT dom test suite, since tycho-surefire-plugin started to adopt surefire 3.0.0.M6, as described in https://github.com/eclipse/tycho/issues/879#issuecomment-1096454637

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**Issue Links:**
- [SUREFIRE-1845](https://issues.apache.org/jira/browse/SUREFIRE-1845) Fixed the performance of Utf8RecodingDeferredFileOutputStream as a bottleneck for the tests with logs
(_**"is caused by"**_)

1 votes, 4 watchers

Start by reproducing the Eclipse JDT DOM test suite case described in the issue and inspect the caching change from SUREFIRE-1845. Trace which per-test data remains retained and verify the result with a several-thousand-test suite; done means the cache no longer scales into an OutOfMemoryError.

Written by the indexing model from the issue text.