Sahil Takiar created IMPALA-8962:
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Summary: FETCH_ROWS_TIMEOUT_MS should apply before rows are
available
Key: IMPALA-8962
URL: https://issues.apache.org/jira/browse/IMPALA-8962
Project: IMPALA
Issue Type: Bug
Components: Clients
Reporter: Sahil Takiar
Assignee: Sahil Takiar
IMPALA-7312 added a fetch timeout controlled by the query option
{{FETCH_ROWS_TIMEOUT_MS}}. The issue is that the timeout only applies after the
*first* batch of rows are available. The issue is that both Beeswax and HS2
clients call {{request_state->BlockOnWait}} inside
{{ImpalaServer::FetchInternal}}. The call to {{BlockOnWait}} blocks until rows
are ready to be consumed via {{ClientRequestState::FetchRows}}.
So clients can still end up blocking indefinitely waiting for the first row
batch to appear.
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