Riza Suminto created IMPALA-10337:
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Summary: DCHECK hit at SpillableRowBatchQueue when row size exceed
max reservation
Key: IMPALA-10337
URL: https://issues.apache.org/jira/browse/IMPALA-10337
Project: IMPALA
Issue Type: Bug
Components: Backend
Affects Versions: Impala 3.4.0
Reporter: Riza Suminto
While working on IMPALA-9856, I found that the following DCHECK in
SpillableRowBatchQueue::AddBatch consistently hit when result spooling is
enabled and row size is larger than resource_profile_.max_reservation, causing
impalad to crash.
[https://github.com/apache/impala/blob/eea617b/be/src/runtime/spillable-row-batch-queue.cc#L97]
We can reproduce this issue by adding the following query options in
query_test/test_insert.py::TestInsertQueries::test_insert_large_string
{code:java}
self.client.set_configuration_option("spool_query_results", "1")
self.client.set_configuration_option("max_row_size", "257mb"){code}
Additionally, setting max_result_spooling_mem to 512MB will increase
resource_profile_.max_reservation to fit the large row and avoid this DCHECK.
Instead of DCHECK, I think impalad should return error status, suggesting that
user need to set larger max_result_spooling_mem.
Another solution is to also consider max_row_size when computing
maxMemReservationBytes in PlanRootSink.java.
[https://github.com/apache/impala/blob/eea617b/fe/src/main/java/org/apache/impala/planner/PlanRootSink.java#L74]
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