Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15865
@ConeyLiu Let us please make the title `[SPARK-18420][BUILD] Fix the errors
caused by lint check in Java` for this PR and Jira you opened.
I think for the one below:
```
[ERROR]
src/main/java/org/apache/spark/io/NioBufferedFileInputStream.java:[133]
(coding) NoFinalizer: Avoid using finalizer method.
```
we should disable the lint for the lines because it seems a required one. I
guess you should disable the lines or work around this.
Could we then remove `hasher` in `HiveHasherSuite.java` if it is not used?
FWIW, I just checked that this private instance is not referenced in
`HiveHasherSuite.java` for sure.
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