Sankar Hariappan created HIVE-20761:
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Summary: Select for update on notification sequence table has
retry interval and retries count too small.
Key: HIVE-20761
URL: https://issues.apache.org/jira/browse/HIVE-20761
Project: Hive
Issue Type: Bug
Components: HiveServer2, Metastore
Affects Versions: 4.0.0
Reporter: Sankar Hariappan
Assignee: Sankar Hariappan
Hive DDL's are intermittently failing with Error- Couldn't acquire the DB log
notification lock because we reached the maximum # of retries: 5 retries
{code:java}
Error while processing statement: FAILED: Execution Error, return code 1 from
org.apache.hadoop.hive.ql.exec.DDLTask. MetaException(message:Couldn't acquire
the DB log notification lock because we reached the maximum # of retries: 5
retries. If this happens too often, then is recommended to increase the maximum
number of retries on the hive.notification.sequence.lock.max.retries
configuration :: Error executing SQL query "select "NEXT_EVENT_ID" from
"NOTIFICATION_SEQUENCE" for update".)
2018-08-28 01:17:56,808|INFO|MainThread|machine.py:183 -
run()||GUID=94e6ff4d-5db8-45eb-8654-76f546e7f0b3|java.sql.SQLException: Error
while processing statement: FAILED: Execution Error, return code 1 from
org.apache.hadoop.hive.ql.exec.DDLTask. MetaException(message:Couldn't acquire
the DB log notification lock because we reached the maximum # of retries: 5
retries. If this happens too often, then is recommended to increase the maximum
number of retries on the hive.notification.sequence.lock.max.retries
configuration :: Error executing SQL query "select "NEXT_EVENT_ID" from
"NOTIFICATION_SEQUENCE" for update".){code}
It seems, metastore operations are slow in this cluster and hence concurrent
writes/DDL operations are failing to lock the row for update.
Currently, the sleep interval between retries is specified via the config
*hive.notification.sequence.lock.retry.sleep.interval*. The default value is
500 ms which seems to be too small. Can we set higher values for sleep interval
and retries count,
*hive.notification.sequence.lock.retry.sleep.interval=10s*
*hive.notification.sequence.lock.max.retries=10*
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