jerqi commented on code in PR #16:
URL: https://github.com/apache/incubator-uniffle/pull/16#discussion_r912895756
##########
server/src/main/java/org/apache/uniffle/server/ShuffleFlushManager.java:
##########
@@ -135,59 +139,62 @@ public void addToFlushQueue(ShuffleDataFlushEvent event) {
private void flushToFile(ShuffleDataFlushEvent event) {
- Storage storage = storageManager.selectStorage(event);
- if (!storage.canWrite()) {
- addPendingEvents(event);
- return;
- }
-
long start = System.currentTimeMillis();
List<ShufflePartitionedBlock> blocks = event.getShuffleBlocks();
boolean writeSuccess = false;
try {
- if (blocks == null || blocks.isEmpty()) {
- LOG.info("There is no block to be flushed: " + event);
- } else if (!event.isValid()) {
- // avoid printing error log
- writeSuccess = true;
- LOG.warn("AppId {} was removed already, event {} should be dropped",
event.getAppId(), event);
- } else {
- ShuffleWriteHandler handler = storage.getOrCreateWriteHandler(new
CreateShuffleWriteHandlerRequest(
- storageType,
- event.getAppId(),
- event.getShuffleId(),
- event.getStartPartition(),
- event.getEndPartition(),
- storageBasePaths,
- shuffleServerId,
- hadoopConf,
- storageDataReplica));
+ Storage storage = storageManager.selectStorage(event);
+ // storage info maybe null if the application cache was cleared already
+ if (storage != null) {
+ if (!storage.canWrite()) {
+ addPendingEvents(event);
Review Comment:
Why do we put the code into
```
try {
} catch {
} finally {
}
```
We release memory in the finally block, when we add the event to
PendingEvents, we shouldn't release the event memory.
##########
server/src/main/java/org/apache/uniffle/server/ShuffleFlushManager.java:
##########
@@ -285,7 +292,9 @@ void processPendingEvents() throws Exception {
pendingEventTimeoutSec, event.getEvent());
return;
}
- if (storage.canWrite()) {
+ // storage maybe null if the application cache was cleared already
+ // add event to flush queue, and it will be released
+ if (storage == null || storage.canWrite()) {
Review Comment:
when storage equals `null`, why do we need add it to the FlushQueue?
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