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https://issues.apache.org/jira/browse/HBASE-28662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17854734#comment-17854734
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Istvan Toth commented on HBASE-28662:
-------------------------------------
On closer inspection, the problem is that we're trying to remove a null key,
which is unsupported.
I'm not sure how we can have null key at that point:
{noformat}
Caused by: java.lang.NullPointerException
at
java.util.concurrent.ConcurrentHashMap.replaceNode(ConcurrentHashMap.java:1106)
at
java.util.concurrent.ConcurrentHashMap.remove(ConcurrentHashMap.java:1097)
at
com.github.benmanes.caffeine.cache.BoundedLocalCache.removeNoWriter(BoundedLocalCache.java:2092)
at
com.github.benmanes.caffeine.cache.BoundedLocalCache.remove(BoundedLocalCache.java:2082)
at
org.apache.hadoop.hbase.rest.ScannerResource.delete(ScannerResource.java:79)
at
org.apache.hadoop.hbase.rest.ScannerInstanceResource.delete(ScannerInstanceResource.java:202)
{noformat}
> Removing missing scanner via REST should return 404
> ---------------------------------------------------
>
> Key: HBASE-28662
> URL: https://issues.apache.org/jira/browse/HBASE-28662
> Project: HBase
> Issue Type: Bug
> Components: REST
> Reporter: Istvan Toth
> Assignee: Istvan Toth
> Priority: Minor
>
> We do not handle the case when the user is trying to remove a missing
> scanner, and let an NPE bubble up to Jersey.
> We should check or catch the error and return 404 instead.
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