siddharthteotia edited a comment on issue #4876: Capture the exact UPDATE operation in DefaultColumnHandler URL: https://github.com/apache/incubator-pinot/pull/4876#issuecomment-560783008 > Can you copy paste the sample exception log here? > > Plus, it seems there's no code change in `V3DefaultColumnHandler`, which means we still don't know what action we're trying to do. Can you adjust the code there? @jackjlli , See the exception trace below. Note that I have removed the table name and column name. Change to V3DefaultColumnHandler is not needed since we print the action today. However, since we only capture UPDATE_METRIC or UPDATE_DIMENSION, the log doesn't indicate what kind of update is asked by the schema for the particular column. ```2019/11/28 17:44:52.322 INFO [HelixInstanceDataManager] [HelixTaskExecutor-message_handle_thread] [pinot-server] [] Reloading all segments in table: blah_table 2019/11/28 17:44:52.325 INFO [HelixInstanceDataManager] [HelixTaskExecutor-message_handle_thread] [pinot-server] [] Reloading segment: blah_table_segment in blah_table 2019/11/28 17:44:53.058 INFO [V3DefaultColumnHandler] [HelixTaskExecutor-message_handle_thread] [pinot-server] [] Starting default column action: UPDATE_METRIC on column: blah_column 2019/11/28 17:44:53.058 INFO [LoaderUtils] [HelixTaskExecutor-message_handle_thread] [pinot-server] [] Trying to recover index directory: blah blah blah 715149 2019/11/28 17:44:53.058 INFO [LoaderUtils] [HelixTaskExecutor-message_handle_thread] [pinot-server] [] Deleting index directory: blah blah blah 715150 2019/11/28 17:44:53.149 ERROR [HelixTask] [HelixTaskExecutor-message_handle_thread] [pinot-server] [] Exception while executing a message.java.lang.RuntimeException: Caught exception while reloading segment: in table 715151 java.lang.RuntimeException: Caught exception while reloading segment: in table: blah_table 715152 at org.apache.pinot.server.starter.helix.SegmentMessageHandlerFactory$SegmentReloadMessageHandler.handleMessage(SegmentMessageHandlerFactory.java:182) 715153 at org.apache.helix.messaging.handling.HelixTask.call(HelixTask.java:97) ~[helix-core-0.8.4.905.jar:0.8.4.905] 715154 at org.apache.helix.messaging.handling.HelixTask.call(HelixTask.java:49) ~[helix-core-0.8.4.905.jar:0.8.4.905] 715155 at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_172] 715156 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[?:1.8.0_172] 715157 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_172] 715158 at java.lang.Thread.run(Thread.java:748) [?:1.8.0_172] 715159 Caused by: org.apache.pinot.core.segment.index.loader.V3RemoveIndexException: Default value indices for column: blah blah cannot be removed for V3 format segment. 715160 at org.apache.pinot.core.segment.index.loader.defaultcolumn.V3DefaultColumnHandler.updateDefaultColumn(V3DefaultColumnHandler.java:54) 715161 at org.apache.pinot.core.segment.index.loader.defaultcolumn.BaseDefaultColumnHandler.updateDefaultColumns(BaseDefaultColumnHandler.java:100) 715162 at org.apache.pinot.core.segment.index.loader.SegmentPreProcessor.process(SegmentPreProcessor.java:90) 715163 at org.apache.pinot.core.indexsegment.immutable.ImmutableSegmentLoader.load(ImmutableSegmentLoader.java:101) 715164 at org.apache.pinot.server.starter.helix.HelixInstanceDataManager.reloadSegment(HelixInstanceDataManager.java:223) 715165 at org.apache.pinot.server.starter.helix.HelixInstanceDataManager.reloadAllSegments(HelixInstanceDataManager.java:183) 715166 at org.apache.pinot.server.starter.helix.SegmentMessageHandlerFactory$SegmentReloadMessageHandler.handleMessage(SegmentMessageHandlerFactory.java:171) ```
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