kaxil edited a comment on issue #8153: Make the default TI pool slots '1' URL: https://github.com/apache/airflow/pull/8153#issuecomment-609186914 I have tested this manually on my machine. I installed 1.10.9 ran a few examples DAGs, upgraded to 1.10.10rc2, Visited old Task Instance details of old tasks and was able to see the error, also could see the error in Scheduler if the TIs were still queued before I upgraded to 1.10.10rc2 and applied migrations. I applied the fix in the PR and ran the Webserver and scheduler again and both ran fine and I was able to see Task Instance details. Note: I am not updating all the Null values in TI table for old records as this table can be pretty huge which was also the intention in the original PR: https://github.com/apache/airflow/pull/7160 to keep old behaviour and let the column be Nullable.
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