Roman Khachatryan created FLINK-35786:
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Summary: 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
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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