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_r240464776
##########
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);
Review comment:
Shall we use a short form (10 lines) instead of line 680 ~ 694?
```java
Thread thread = new Thread(() -> {
int i = 0;
long used = 0;
while (i < 10) {
c1.use(10000000);
used += 10000000;
i++;
}
c1.free(used);
});
```
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
With regards,
Apache Git Services
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
