Sahil Takiar created IMPALA-9124:
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Summary: Transparently retry queries that fail due to cluster
membership changes
Key: IMPALA-9124
URL: https://issues.apache.org/jira/browse/IMPALA-9124
Project: IMPALA
Issue Type: New Feature
Components: Backend, Clients
Reporter: Sahil Takiar
Assignee: Sahil Takiar
Currently, if the Impala Coordinator or any Executors run into errors during
query execution, Impala will fail the entire query. It would improve user
experience to transparently retry the query for some transient, recoverable
errors.
This JIRA focuses on retrying queries that would otherwise fail due to cluster
membership changes. Specifically, node failures that cause changes in the
cluster membership (currently the Coordinator cancels all queries running on a
node if it detects that the node is no longer part of the cluster) and node
blacklisting (the Coordinator blacklists a node because it detects a problem
with that node - can’t execute RPCs against the node). It is not focused on
retrying general errors (e.g. any frontend errors, MemLimitExceeded exceptions,
etc.).
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