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https://issues.apache.org/jira/browse/FLINK-35786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated FLINK-35786:
-----------------------------------
Labels: pull-request-available (was: )
> NPE in BlobServer / shutdownHook
> --------------------------------
>
> Key: FLINK-35786
> URL: https://issues.apache.org/jira/browse/FLINK-35786
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Coordination
> Affects Versions: 1.19.1
> Reporter: Roman Khachatryan
> Assignee: Roman Khachatryan
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.20.0, 1.19.2
>
>
> In constructor, BlobServer registers a shutdown hook to close the socket.
> Later in constructor, BlobServer creates this socket (and makes sure it's not
> null).
>
> But if the shutdown hook gets invoked before opening the socket, NPE will be
> thrown:
> {code:java}
> 12:02:49,983 [PermanentBlobCache shutdown hook] INFO
> org.apache.flink.runtime.blob.PermanentBlobCache [] - Shutting
> down BLOB cache
> 12:02:49,985 [BlobServer shutdown hook] ERROR
> org.apache.flink.runtime.blob.BlobServer [] - Error
> during shutdown of BlobServer via JVM shutdown hook.
> java.lang.NullPointerException: null
> at
> org.apache.flink.runtime.blob.BlobServer.close(BlobServer.java:358)
> ~[classes/:?]
> at
> org.apache.flink.util.ShutdownHookUtil.lambda$addShutdownHook$0(ShutdownHookUtil.java:39)
> ~[flink-core-1.19-SNAPSHOT.jar:1.19-SNAPSHOT]
> at java.lang.Thread.run(Thread.java:829) [?:?]
> {code}
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