Comments (3)
csalperwyck
commented on June 18, 2024
Hi,
I am not sure if this can help, but you could also try to plug Flink
directly to MOA:
https://moa.cms.waikato.ac.nz/moa-with-apache-flink/
For testing purpose, you could also try to limit SAMOA to use only one core
so that you don't have concurrent access to the "list".
Best,
Christophe
Le mer. 27 mars 2019 à 18:10, moussaoui07 <[email protected]> a
écrit :
… Hi,
I use MCOD for anomalies detection in stream with flink but I have an
error in the code when i pass the instance to MCOD:
Caused by: java.util.ConcurrentModificationException: null
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909)
at java.util.ArrayList$Itr.next(ArrayList.java:859)
at moa.clusterers.outliers.MCOD.MCOD.ProcessExpiredNode(MCOD.java:360)
at moa.clusterers.outliers.MCOD.MCOD.ProcessNewStreamObj(MCOD.java:398)
at
moa.clusterers.outliers.MyBaseOutlierDetector.processNewInstanceImpl(MyBaseOutlierDetector.java:157)
at
etl.samoa.SamoaAnomalyDetection.mapPartition(SamoaAnomalyDetection.java:84)
at
org.apache.flink.runtime.operators.MapPartitionDriver.run(MapPartitionDriver.java:103)
at org.apache.flink.runtime.operators.BatchTask.run(BatchTask.java:503)
at org.apache.flink.runtime.operators.BatchTask.invoke(BatchTask.java:368)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:704)
at java.lang.Thread.run(Thread.java:748)
the line of code that causes this error is:
outlierDetector.processNewInstanceImpl(samoaInstance);
how can we avoid this error or fix it ?
Thank's in advance !
Cordially,
Anissa
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moussaoui07
commented on June 18, 2024
Hello,
Thank you for your reply !
I have already tried to put a single heart with a flink setParallelism at 1 but I always have the competition error !!
So I do not know how to correct this error.
Best,
Aniisa
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csalperwyck
commented on June 18, 2024
Hello,
I think it's a bug in their code... There a proposal to fix it there but
you need to modify the source code:
https://groups.google.com/forum/#!topic/moa-users/QhvNcpIRIFg
Best,
Christophe
Le sam. 6 avr. 2019 à 10:59, moussaoui07 <[email protected]> a
écrit :
… Hello,
Thank you for your reply !
I have already tried to put a single heart with a flink setParallelism at
1 but I always have the competition error !!
So I do not know how to correct this error.
Best,
Aniisa
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