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Posted to dev@hive.apache.org by "Karen Coppage (Jira)" <ji...@apache.org> on 2021/08/05 10:10:00 UTC

[jira] [Created] (HIVE-25429) Delta metrics collection may cause number of tez counters to exceed tez.counters.max limit

Karen Coppage created HIVE-25429:
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             Summary: Delta metrics collection may cause number of tez counters to exceed tez.counters.max limit
                 Key: HIVE-25429
                 URL: https://issues.apache.org/jira/browse/HIVE-25429
             Project: Hive
          Issue Type: Sub-task
          Components: Hive
    Affects Versions: 4.0.0
            Reporter: Karen Coppage
            Assignee: Karen Coppage


There's a limit to the number of tez counters allowed (tez.counters.max). Delta metrics collection (i.e. DeltaFileMetricsReporter) was creating 3 counters for each partition touched by a given query, which can result in a huge number of counters, which is unnecessary because we're only interested in n number of partitions with the most deltas. This change limits the number of counters created to hive.txn.acid.metrics.max.cache.size*3.

Also when tez.counters.max is reached a LimitExceededException is thrown but isn't caught on the Hive side and causes the query to fail. We should catch this and skip delta metrics collection in this case.



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