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  1. Hive
  2. HIVE-20761

Select for update on notification_sequence table has retry interval and retries count too small.

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      Description

      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

      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".)

      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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        1. HIVE-20761.01.patch
          3 kB
          Sankar Hariappan

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            • Assignee:
              sankarh Sankar Hariappan
              Reporter:
              sankarh Sankar Hariappan
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