Github user zentol commented on the issue:
https://github.com/apache/flink/pull/4112
Looks like the same problem we have in flink-core also exists in
flink-runtime, some braces are missing...
```
[INFO] There are 10 errors reported by Checkstyle 6.19 with
/tools/maven/checkstyle.xml ruleset.
[ERROR]
src/main/java/org/apache/flink/runtime/broadcast/BroadcastVariableMaterialization.java:[134]
(blocks) NeedBraces: 'while' construct must use '{}'s.
[ERROR]
src/main/java/org/apache/flink/runtime/io/network/netty/NettyBufferPool.java:[25,1]
(imports) IllegalImport: Import from illegal package -
io.netty.util.internal.PlatformDependent.
[ERROR]
src/main/java/org/apache/flink/runtime/iterative/task/AbstractIterativeTask.java:[247]
(blocks) NeedBraces: 'while' construct must use '{}'s.
[ERROR]
src/main/java/org/apache/flink/runtime/operators/AbstractCachedBuildSideJoinDriver.java:[176]
(blocks) NeedBraces: 'while' construct must use '{}'s.
[ERROR]
src/main/java/org/apache/flink/runtime/operators/AbstractOuterJoinDriver.java:[160]
(blocks) NeedBraces: 'while' construct must use '{}'s.
[ERROR]
src/main/java/org/apache/flink/runtime/operators/JoinDriver.java:[222] (blocks)
NeedBraces: 'while' construct must use '{}'s.
[ERROR]
src/main/java/org/apache/flink/runtime/operators/sort/AbstractMergeInnerJoinIterator.java:[68]
(blocks) NeedBraces: 'while' construct must use '{}'s.
[ERROR]
src/main/java/org/apache/flink/runtime/operators/sort/AbstractMergeInnerJoinIterator.java:[69]
(blocks) NeedBraces: 'while' construct must use '{}'s.
[ERROR]
src/main/java/org/apache/flink/runtime/operators/sort/AbstractMergeOuterJoinIterator.java:[92]
(blocks) NeedBraces: 'while' construct must use '{}'s.
[ERROR]
src/main/java/org/apache/flink/runtime/operators/sort/AbstractMergeOuterJoinIterator.java:[103]
(blocks) NeedBraces: 'while' construct must use '{}'s.
```
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