[FLINK-16973][tests] Add tooling for collecting jvm crash files

tools/ci/maven-utils.sh

@@ -67,3 +67,13 @@ function setup_maven {
 
 	echo "Installed Maven ${MAVEN_VERSION} to ${M2_HOME}"
 }
+
+function collect_coredumps {
+	local SEARCHDIR=$1
+	local TARGET_DIR=$2
+	echo "Searching for .dump, .dumpstream and related files in '$SEARCHDIR'"
+	for file in `find $SEARCHDIR -type f -regextype posix-extended -iregex '.*\.dump|.*\.dumpstream|.*hs.*\.log|.*/core(.[0-9]+)?$'`; do
+		echo "Moving '$file' to target directory ('$TARGET_DIR')"
+		mv $file $TARGET_DIR/
+	done
+}

tools/travis_watchdog.sh

@@ -97,6 +97,10 @@ if [ ! -z "$TF_BUILD" ] ; then
 	ARTIFACTS_FILE=${BUILD_BUILDNUMBER}.tar.gz
 fi
 
+# enable coredumps
+ulimit -c unlimited
+export JAVA_TOOL_OPTIONS="-XX:+HeapDumpOnOutOfMemoryError"
+
 if [ $TEST == $STAGE_PYTHON ]; then
 	CMD=$PYTHON_TEST
 	CMD_PID=$PYTHON_PID
@@ -276,6 +280,8 @@ case $TEST in
 	;;
 esac
 
+collect_coredumps `pwd` $ARTIFACTS_DIR
+
 upload_artifacts_s3
 
 # since we are in flink/tools/artifacts