[jira] [Created] (IMPALA-6663) Expose current DDL metrics (grouped by type) in the Catalog web UI

["bharath v (JIRA)" <ji...@apache.org>]

bharath v created IMPALA-6663:
---------------------------------

             Summary: Expose current DDL metrics (grouped by type) in the Catalog web UI
                 Key: IMPALA-6663
                 URL: https://issues.apache.org/jira/browse/IMPALA-6663
             Project: IMPALA
          Issue Type: Improvement
    Affects Versions: Impala 2.12.0
            Reporter: bharath v


It helps if the catalog server can expose currently running (counts) DDL and RESET_METADATA requests via the web UI metrics. From an observability/supportability point of view, these numbers help reason about the Cluster behavior during Catalog heavy load or in situations where Catalog server is the bottleneck

Following are some of the interesting ones that I think are interesting.

{noformat}
enum TDdlType {
  ALTER_TABLE,
  ALTER_VIEW,
  CREATE_DATABASE,
  CREATE_TABLE,
  CREATE_TABLE_AS_SELECT,
  CREATE_TABLE_LIKE,
  CREATE_VIEW,
  CREATE_FUNCTION,
  COMPUTE_STATS,
  DROP_DATABASE,
  DROP_TABLE,
  DROP_VIEW,
  DROP_FUNCTION,
  CREATE_DATA_SOURCE,
  DROP_DATA_SOURCE,
  DROP_STATS,
  CREATE_ROLE,
  DROP_ROLE,
  GRANT_ROLE,
  REVOKE_ROLE,
  GRANT_PRIVILEGE,
  REVOKE_PRIVILEGE,
  TRUNCATE_TABLE,
}

TCatalogOpType.RESET_METADATA
TStmtType.DML
{noformat}

This should be based on the metrics framework added in IMPALA-4886.



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