dongjoon-hyun commented on a change in pull request #23272: [SPARK-26265][Core]
Fix deadlock in BytesToBytesMap.MapIterator when locking both
BytesToBytesMap.MapIterator and TaskMemoryManager
URL: https://github.com/apache/spark/pull/23272#discussion_r240465896
##########
File path:
core/src/test/java/org/apache/spark/unsafe/map/AbstractBytesToBytesMapSuite.java
##########
@@ -667,4 +669,54 @@ public void testPeakMemoryUsed() {
}
}
+ @Test
+ public void avoidDeadlock() throws InterruptedException {
+ memoryManager.limit(PAGE_SIZE_BYTES);
+ MemoryMode mode = useOffHeapMemoryAllocator() ? MemoryMode.OFF_HEAP:
MemoryMode.ON_HEAP;
+ TestMemoryConsumer c1 = new TestMemoryConsumer(taskMemoryManager, mode);
+ BytesToBytesMap map =
+ new BytesToBytesMap(taskMemoryManager, blockManager, serializerManager,
1, 0.5, 1024);
+
+ Runnable memoryConsumer = new Runnable() {
+ @Override
+ public void run() {
+ int i = 0;
+ long used = 0;
+ while (i < 10) {
+ c1.use(10000000);
+ used += 10000000;
+ i++;
+ }
+ c1.free(used);
+ }
+ };
+
+ Thread thread = new Thread(memoryConsumer);
+
+ try {
+ int i;
+ for (i = 0; i < 1024; i++) {
Review comment:
Let's use `for (int i = 0; ...` here and line 708 because `int i` is not
referenced outside of `for` loop.
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