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nic pushed a commit to branch 2.6.x
in repository https://gitbox.apache.org/repos/asf/kylin.git

commit 9e3533865788beec74fe060d6cdc8992c6142dc4
Author: nichunen <[email protected]>
AuthorDate: Fri Feb 7 15:39:08 2020 +0800

    Fix not thread-safe double-checked locking
---
 .../src/main/java/org/apache/kylin/measure/topn/TopNMeasureType.java    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git 
a/core-metadata/src/main/java/org/apache/kylin/measure/topn/TopNMeasureType.java
 
b/core-metadata/src/main/java/org/apache/kylin/measure/topn/TopNMeasureType.java
index 472de3c..ce136ea 100644
--- 
a/core-metadata/src/main/java/org/apache/kylin/measure/topn/TopNMeasureType.java
+++ 
b/core-metadata/src/main/java/org/apache/kylin/measure/topn/TopNMeasureType.java
@@ -129,7 +129,7 @@ public class TopNMeasureType extends 
MeasureType<TopNCounter<ByteArray>> {
             private List<TblColRef> literalCols = null;
             private int keyLength = 0;
 
-            private DimensionEncoding[] newDimensionEncodings = null;
+            private volatile DimensionEncoding[] newDimensionEncodings = null;
             private int newKeyLength = 0;
             private boolean needReEncode = true;
 

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