Parallel Chunk: Parallel chunks are not present anymore

Feedback & Ideas
1

Hi,

since recently the Parallel Chunk End node occasionally throws this error: Parallel chunks are not present anymore

But I cannot find or deduce any possible cause. Here is the log:

2025-02-24 10:09:05,258 : ERROR : KNIME-Worker-204-Parallel Chunk End 3:1946:0:1944:0:1939 :  : Node : Parallel Chunk End : 3:1946:0:1944:0:1939 : Parallel chunks are not present anymore.
org.knime.core.node.KNIMEException: Parallel chunks are not present anymore.
	at org.knime.core.node.KNIMEException.of(KNIMEException.java:124)
	at org.knime.core.node.message.Message.toKNIMEException(Message.java:221)
	at org.knime.core.node.workflow.virtual.parallelchunkend.ParallelChunkEndMultiPortNodeModel.execute(ParallelChunkEndMultiPortNodeModel.java:216)
	at org.knime.core.node.NodeModel.executeModel(NodeModel.java:596)
	at org.knime.core.node.Node.invokeFullyNodeModelExecute(Node.java:1284)
	at org.knime.core.node.Node.execute(Node.java:1049)
	at org.knime.core.node.workflow.NativeNodeContainer.performExecuteNode(NativeNodeContainer.java:603)
	at org.knime.core.node.exec.LocalNodeExecutionJob.mainExecute(LocalNodeExecutionJob.java:98)
	at org.knime.core.node.workflow.NodeExecutionJob.internalRun(NodeExecutionJob.java:198)
	at org.knime.core.node.workflow.NodeExecutionJob.run(NodeExecutionJob.java:117)
	at org.knime.core.util.ThreadUtils$RunnableWithContextImpl.runWithContext(ThreadUtils.java:369)
	at org.knime.core.util.ThreadUtils$RunnableWithContext.run(ThreadUtils.java:223)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
	at org.knime.core.util.ThreadPool$MyFuture.run(ThreadPool.java:123)
	at org.knime.core.util.ThreadPool$Worker.run(ThreadPool.java:246)

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Resetting and executing again seems to mitigate the issue but it’s quite annoying to manually intervene each time.

Best
Mike

2

Hey @mwiegand,

When does this occur? do you typically see it after running a workflow for a while? or is it sparse?

TL

3

Hey @thor_landstrom,

pretty much at first run after starting Knime. Once reset and retried, it works.

Cheers
Mike

1 Like
4

Hey @mwiegand,

Since you mention it only happens on startup, I think its probably due to the buffer being cleared and the chunk not being in there anymore. I made a ticket for it AP-24058.

I will let you know if I see any updates on it.

TL

3 Likes
5

Thanks Thor, let me know if I assist in additional debugging.

1 Like