[iotdb] branch master updated: Fix NPE (#5722)

[jackietien]

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jackietien pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/iotdb.git


The following commit(s) were added to refs/heads/master by this push:
     new 8f8dfa281a Fix NPE (#5722)
8f8dfa281a is described below

commit 8f8dfa281a1e50bc4b6d542770a240cd5b2fb128
Author: Zhong Wang <wangzhong...@alibaba-inc.com>
AuthorDate: Thu Apr 28 22:08:43 2022 +0800

    Fix NPE (#5722)
---
 server/src/main/java/org/apache/iotdb/db/mpp/buffer/SourceHandle.java | 4 +++-
 server/src/main/java/org/apache/iotdb/db/mpp/memory/MemoryPool.java   | 4 ++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git 
a/server/src/main/java/org/apache/iotdb/db/mpp/buffer/SourceHandle.java 
b/server/src/main/java/org/apache/iotdb/db/mpp/buffer/SourceHandle.java
index 6037ab8779..b56ea90a5d 100644
--- a/server/src/main/java/org/apache/iotdb/db/mpp/buffer/SourceHandle.java
+++ b/server/src/main/java/org/apache/iotdb/db/mpp/buffer/SourceHandle.java
@@ -214,7 +214,9 @@ public class SourceHandle implements ISourceHandle {
     if (blocked != null && !blocked.isDone()) {
       blocked.cancel(true);
     }
-    bufferRetainedSizeInBytes -= 
localMemoryManager.getQueryPool().tryCancel(blockedOnMemory);
+    if (blockedOnMemory != null) {
+      bufferRetainedSizeInBytes -= 
localMemoryManager.getQueryPool().tryCancel(blockedOnMemory);
+    }
     sequenceIdToDataBlockSize.clear();
     if (bufferRetainedSizeInBytes > 0) {
       localMemoryManager
diff --git 
a/server/src/main/java/org/apache/iotdb/db/mpp/memory/MemoryPool.java 
b/server/src/main/java/org/apache/iotdb/db/mpp/memory/MemoryPool.java
index 14950ed94c..e47504ad0e 100644
--- a/server/src/main/java/org/apache/iotdb/db/mpp/memory/MemoryPool.java
+++ b/server/src/main/java/org/apache/iotdb/db/mpp/memory/MemoryPool.java
@@ -141,11 +141,11 @@ public class MemoryPool {
    *     return 0.
    */
   public synchronized long tryCancel(ListenableFuture<Void> future) {
+    Validate.notNull(future);
+    // If the future is not a MemoryReservationFuture, it must have been 
completed.
     if (future.isDone()) {
       return 0L;
     }
-
-    Validate.notNull(future);
     Validate.isTrue(
         future instanceof MemoryReservationFuture,
         "invalid future type " + future.getClass().getSimpleName());