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Support Article

DataFlow error in Batch processing



Creating a dataflow and running through Batch processing throws an error.

Error Messages

Unable to create assignments for run [DataFlowRunConfig{className=GM-NBAAOns-AYSData-VIN_DATA, ruleName=AYSDataFeed, workObjectId=DF-112, testRun=false, realTimeRun=dalse, publishUrlName=, accessGroup=NBAAOns:Administrators, batchSize=250}]

at com.pega.dsm.dnode.impl.dataflow.service.WorkObjectDataFlowRun.prepare( at com.pega.dsm.dnode.impl.dataflow.service.WorkObjectDataFlowRun.prepareAndExecute( at com.pega.dsm.dnode.impl.dataflow.service.DataFlowServiceImpl$1.execute( at

2017-01-26 16:26:32,954 [Access group: [null]] [ STANDARD] [ ] [ ] (andraBrowseAllRecordsOperation) ERROR - No hosts available
com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /172.16.7.xx.xx (com.datastax.driver.core.OperationTimedOutException: [/] Operation timed out))
at com.datastax.driver.core.ControlConnection.reconnectInternal(

Steps to Reproduce

1. Create a data flow.
2. Try to run it through Batch processing and observe the error.

Root Cause

A defect or configuration issue in the operating environment. com.datastax.driver.core.exceptions.NoHostAvailableException:

From the above error trace, it is a Cassandra connection.


Perform the following local-change steps:

1. From the DNode cluster management landing page, check the status of each node and the disk size information. All nodes should be in Normal-online mode.

2. Also check the disk space (Cassandra data). Sometimes the batch processed data flow fails due to the low disk size also.

Published March 16, 2017 - Updated December 2, 2021

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