arina-ielchiieva commented on a change in pull request #1822: DRILL-7317: Close
ClassLoaders used for udf jars uploading when closing
FunctionImplementationRegistry
URL: https://github.com/apache/drill/pull/1822#discussion_r300864918
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/registry/FunctionRegistryHolder.java
##########
@@ -376,28 +377,78 @@ private void removeAllByJar(String jarName) {
return;
}
+ boolean isClosed = false;
for (Map.Entry<String, Queue<String>> functionEntry : jar.entrySet()) {
final String function = functionEntry.getKey();
Map<String, DrillFuncHolder> functionHolders = functions.get(function);
Queue<String> functionSignatures = functionEntry.getValue();
- for (Map.Entry<String, DrillFuncHolder> entry :
functionHolders.entrySet()) {
- if (functionSignatures.contains(entry.getKey())) {
- ClassLoader classLoader = entry.getValue().getClassLoader();
- if (classLoader instanceof AutoCloseable) {
- try {
- ((AutoCloseable) classLoader).close();
- } catch (Exception e) {
- logger.warn("Problem during closing class loader", e);
- }
- }
- break;
- }
- }
+ // closes class loader only one time
+ isClosed = !isClosed && closeClassLoader(function, functionSignatures);
functionHolders.keySet().removeAll(functionSignatures);
if (functionHolders.isEmpty()) {
functions.remove(function);
}
}
}
+
+ @Override
+ public void close() {
+ try (@SuppressWarnings("unused") Closeable lock = writeLock.open()) {
+ jars.forEach((jarName, jar) -> {
+ if (!LocalFunctionRegistry.BUILT_IN.equals(jarName)) {
+ for (Map.Entry<String, Queue<String>> functionEntry :
jar.entrySet()) {
+ if (closeClassLoader(functionEntry.getKey(),
functionEntry.getValue())) {
+ // class loader is closed, iterates to another jar
+ break;
+ }
+ }
+ }
+ });
+
+ jars.clear();
+ functions.clear();
+ }
+ }
+
+ /**
+ * Produces search of {@link DrillFuncHolder} which corresponds to specified
{@code String functionName}
+ * with signature from {@code Queue<String> functionSignatures},
+ * closes its class loader if {@link DrillFuncHolder} is found and returns
true. Otherwise faalse is returned.
+ *
+ * @param functionName name of the function
+ * @param functionSignatures function signatures
+ * @return {@code true} if {@link DrillFuncHolder} is found and its class
loader is closed
Review comment:
Not exactly, you return true if even there was a failure when closing class
loader, more correct would be to describe as `return true if func holder was
found and attempted to close class loader disregarding the result`.
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