Hi: I added some logs to trace this problem, found that when call BlockDataMap.getFileFooterEntrySchema, the key 'segmentPropertiesIndex' which was stored in BlockDataMap instance was removed by other thread from SegmentPropertiesAndSchemaHolder.indexToSegmentPropertiesWrapperMapping :
2018-10-31 14:49:24,967 datastore.block.SegmentPropertiesAndSchemaHolder.addSegmentProperties(SegmentPropertiesAndSchemaHolder.java:115) - Thread-39 -========put 37 into indexToSegmentPropertiesWrapperMapping 0 2018-10-31 14:49:25,472 datastore.block.SegmentPropertiesAndSchemaHolder.invalidate(SegmentPropertiesAndSchemaHolder.java:243) - Executor task launch worker for task 926 -========remove 37 out of indexToSegmentPropertiesWrapperMapping 31 2018-10-31 14:49:25,486 indexstore.blockletindex.BlockDataMap.getFileFooterEntrySchema(BlockDataMap.java:1002) - Thread-39 -========get 37 null 2018-10-31 14:56:45,057 datastore.block.SegmentPropertiesAndSchemaHolder.addSegmentProperties(SegmentPropertiesAndSchemaHolder.java:115) - Thread-39 -========put 98 into indexToSegmentPropertiesWrapperMapping 0 2018-10-31 14:56:45,477 datastore.block.SegmentPropertiesAndSchemaHolder.invalidate(SegmentPropertiesAndSchemaHolder.java:243) - Executor task launch worker for task 2653 -========remove 98 out of indexToSegmentPropertiesWrapperMapping 67 2018-10-31 14:56:46,290 indexstore.blockletindex.BlockDataMap.getFileFooterEntrySchema(BlockDataMap.java:1002) - Thread-39 -========get 98 null 2018-10-31 14:56:51,392 indexstore.blockletindex.BlockDataMap.getFileFooterEntrySchema(BlockDataMap.java:1002) - Thread-39 -========get 98 null -- Sent from: http://apache-carbondata-dev-mailing-list-archive.1130556.n5.nabble.com/
