Markus Spann created SUREFIRE-2082:
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Summary: Huge test sets may open too many files
Key: SUREFIRE-2082
URL: https://issues.apache.org/jira/browse/SUREFIRE-2082
Project: Maven Surefire
Issue Type: Bug
Components: Maven Surefire Plugin
Affects Versions: 3.0.0-M6
Reporter: Markus Spann
Test sets with a very large number of tests (such as a JUnit
{{ParameterizedTest}} with a large number of test inputs) cause surefire to
open a file for stdout and another file for stderr as soon as a test method
prints to either of these output streams.
Surefire captures stdout and stderr in temporary files.
These file handles are kept until the very end of the test set
({{{}TestSetRunListener.testSetCompleted{}}}) which may cause the limit of open
files to be reached on a system, resulting in test errors
({{{}java.nio.file.FileSystemException{}}}, too many open files)
This behaviour may have been introduced with the performance improvements of
SUREFIRE-1845.
To reproduce set the maximum allowed open files to a value lower than test
iterations in a test class ({{{}ulimit -n X{}}}, where X is the maximum number
of open files).
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