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https://issues.apache.org/jira/browse/FLINK-6493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16106355#comment-16106355
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ASF GitHub Bot commented on FLINK-6493:
---------------------------------------
Github user tedyu commented on a diff in the pull request:
https://github.com/apache/flink/pull/4328#discussion_r130235370
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/state/RegisteredOperatorBackendStateMetaInfo.java
---
@@ -175,14 +175,21 @@ public boolean equals(Object obj) {
return false;
}
+ Snapshot snapshot;
+
+ if (obj instanceof Snapshot) {
+ snapshot = (Snapshot)obj;
+ } else {
--- End diff --
nit: if you place the condition for else first, declaration and assignment
to snapshot can be done in one line.
> Ineffective null check in RegisteredOperatorBackendStateMetaInfo#equals()
> -------------------------------------------------------------------------
>
> Key: FLINK-6493
> URL: https://issues.apache.org/jira/browse/FLINK-6493
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Reporter: Ted Yu
> Assignee: mingleizhang
> Priority: Minor
> Fix For: 1.4.0
>
>
> {code}
> && ((partitionStateSerializer == null && ((Snapshot)
> obj).getPartitionStateSerializer() == null)
> || partitionStateSerializer.equals(((Snapshot)
> obj).getPartitionStateSerializer()))
> && ((partitionStateSerializerConfigSnapshot == null && ((Snapshot)
> obj).getPartitionStateSerializerConfigSnapshot() == null)
> || partitionStateSerializerConfigSnapshot.equals(((Snapshot)
> obj).getPartitionStateSerializerConfigSnapshot()));
> {code}
> The null check for partitionStateSerializer /
> partitionStateSerializerConfigSnapshot is in combination with another clause.
> This may lead to NPE in the partitionStateSerializer.equals() call.
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