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Posted to commits@pinot.apache.org by GitBox <gi...@apache.org> on 2021/09/27 22:55:07 UTC
[GitHub] [pinot] chenboat opened a new issue #7491: Adding brokers to an existing tenant caused TableNotFound query exception
chenboat opened a new issue #7491:
URL: https://github.com/apache/pinot/issues/7491
We tried to expand a broker tenant _A_ by adding the tenant tag _A_ to a few free brokers (via Controller UI). We observed that the new added brokers started to accept queries even though table re-assignment through Helix is still ongoing. This caused the broker to throw TableNotFound exceptions. This problem is particularly serious if the tenant has a lot of tables and queries. -- which means the Helix transition take longer time to finish.
The new added brokers should not start accepting queries until the table reassignment through Helix is done.
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[GitHub] [pinot] Jackie-Jiang commented on issue #7491: Adding brokers to an existing tenant caused TableNotFound query exception
Posted by GitBox <gi...@apache.org>.
Jackie-Jiang commented on issue #7491:
URL: https://github.com/apache/pinot/issues/7491#issuecomment-937343881
Correct. We should add a controller API to read the `BrokerResource` external view, and returns the broker list based on that.
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[GitHub] [pinot] Jackie-Jiang commented on issue #7491: Adding brokers to an existing tenant caused TableNotFound query exception
Posted by GitBox <gi...@apache.org>.
Jackie-Jiang commented on issue #7491:
URL: https://github.com/apache/pinot/issues/7491#issuecomment-937343881
Correct. We should add a controller API to read the `BrokerResource` external view, and returns the broker list based on that.
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[GitHub] [pinot] chenboat commented on issue #7491: Adding brokers to an existing tenant caused TableNotFound query exception
Posted by GitBox <gi...@apache.org>.
chenboat commented on issue #7491:
URL: https://github.com/apache/pinot/issues/7491#issuecomment-934875663
We use the following controller API
https://github.com/apache/pinot/blob/bb34406aaa205f5c85b88c928d477fd267eda1b4/pinot-controller/src/main/java/org/apache/pinot/controller/api/resources/PinotTableInstances.java#L57
to get the brokers instance of a table. This API gets the brokers based on the instance tag. It does not consider if the external view of the table is updated with the brokers. Instead a controller API should use the same way `DynamicBrokerSelector` discovers the live brokers based on the external view.
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