sunithabeeram opened a new issue #3601: Realtime segment reload fails due to NPE in VirtualColumn code URL: https://github.com/apache/incubator-pinot/issues/3601 Reloading segments for Realtime tables fails with the exception shared below. This happens because virtual columns are written out to the segment file. Exception: com.linkedin.pinot.server.starter.helix.SegmentMessageHandlerFactory$SegmentReloadMessageHandler.handleMessage(SegmentMessageHandlerFactory.java:159) at org.apache.helix.messaging.handling.HelixTask.call(HelixTask.java:96) at org.apache.helix.messaging.handling.HelixTask.call(HelixTask.java:47) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.NullPointerException at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:264) at com.linkedin.pinot.core.segment.virtualcolumn.VirtualColumnProviderFactory.buildProvider(VirtualColumnProviderFactory.java:30) at com.linkedin.pinot.core.indexsegment.immutable.ImmutableSegmentLoader.load(ImmutableSegmentLoader.java:131) at com.linkedin.pinot.server.starter.helix.HelixInstanceDataManager.reloadSegment(HelixInstanceDataManager.java:224) at com.linkedin.pinot.server.starter.helix.HelixInstanceDataManager.reloadAllSegments(HelixInstanceDataManager.java:185) at com.linkedin.pinot.server.starter.helix.SegmentMessageHandlerFactory$SegmentReloadMessageHandler.handleMessage(SegmentMessageHandlerFactory.java:149)
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