Joe McDonnell created IMPALA-14260:
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Summary: Increase the default value for
accepted_cnxn_setup_thread_pool_size
Key: IMPALA-14260
URL: https://issues.apache.org/jira/browse/IMPALA-14260
Project: IMPALA
Issue Type: Task
Components: Backend
Affects Versions: Impala 5.0.0
Reporter: Joe McDonnell
In the presence of bad clients (or certain very slow SASL operations), the
connection setup pool can be overwhelmed, preventing clients from connecting
until the bad connections time out. The size of this pool was already increased
from one to two in IMPALA-7565, but some environments have still seen the pool
overwhelmed. This can cause an unnecessary outage.
There are other approaches to more comprehensively improve this (e.g.
IMPALA-11653 and IMPALA-7638). In the meantime, further increasing the default
value for accepted_cnxn_setup_thread_pool_size makes it less likely that the
pool will be inadvertently overwhelmed by bad clients. It seems like the
default should be at least 5 if not 10.
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