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[SMALLFIX] Use @nullable annotation for methods which may return null

[SMALLFIX] Use the @nullable annotation for all methods which may return
null in
/alluxio/core/server/worker/src/main/java/alluxio/worker/block/BlockMetadataManager.java#getTempBlockMetaOrNull

pr-link: #9076
change-id: cid-88df92b239169942955dce56b5cd20d58c1abd65
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Oceanzzzz authored and alluxio-bot committed May 14, 2019
1 parent 6264882 commit d767602b4e49a265a62a3d580fa4b060754d8b74
Showing with 2 additions and 0 deletions.
  1. +2 −0 core/server/worker/src/main/java/alluxio/worker/block/BlockMetadataManager.java
@@ -35,6 +35,7 @@
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;

import javax.annotation.concurrent.NotThreadSafe;

@@ -263,6 +264,7 @@ public TempBlockMeta getTempBlockMeta(long blockId) throws BlockDoesNotExistExce
* @param blockId the id of the temp block
* @return metadata of the block or null
*/
@Nullable
public TempBlockMeta getTempBlockMetaOrNull(long blockId) {
for (StorageTier tier : mTiers) {
for (StorageDir dir : tier.getStorageDirs()) {

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