[
https://issues.apache.org/jira/browse/HIVE-22888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Denys Kuzmenko updated HIVE-22888:
----------------------------------
Description:
- Created extra (db, tbl, part) index on HIVE_LOCKS table;
- Replaced inner select under checkLocks using multiple IN statements with JOIN
operator;
generated query looks like :
{code}
SELECT LS.* FROM (
SELECT HL_LOCK_EXT_ID, HL_LOCK_INT_ID, HL_DB, HL_TABLE, HL_PARTITION,
HL_LOCK_STATE, HL_LOCK_TYPE, HL_TXNID FROM HIVE_LOCKS
WHERE HL_LOCK_EXT_ID < 14138) LS
INNER JOIN (
SELECT HL_DB, HL_TABLE, HL_PARTITION FROM HIVE_LOCKS WHERE HL_LOCK_EXT_ID =
14138) LBC
ON LS.HL_DB = LBC.HL_DB
AND (LS.HL_TABLE IS NULL OR LS.HL_TABLE = LBC.HL_TABLE
AND (LS.HL_PARTITION IS NULL OR LS.HL_PARTITION = LBC.HL_PARTITION))
WHERE LBC.HL_LOCK_TYPE='e'
OR LBC.HL_LOCK_TYPE='w' AND LS.HL_LOCK_TYPE IN ('w','e')
OR LBC.HL_LOCK_TYPE='r' AND (LS.HL_LOCK_TYPE='e' or LS.HL_LOCK_TYPE='w' and
LS.HL_LOCK_STATE='w')
LIMIT 1;
{code}
was:
- Created extra (db, tbl, part) index on HIVE_LOCKS table;
- Replaced inner select under checkLocks using multiple IN statements with JOIN
operator;
generated query looks like :
{code}
SELECT LS.* FROM (
SELECT HL_LOCK_EXT_ID, HL_LOCK_INT_ID, HL_DB, HL_TABLE, HL_PARTITION,
HL_LOCK_STATE, HL_LOCK_TYPE, HL_TXNID FROM HIVE_LOCKS
WHERE HL_LOCK_EXT_ID < 14138) LS
INNER JOIN (
SELECT HL_DB, HL_TABLE, HL_PARTITION FROM HIVE_LOCKS WHERE HL_LOCK_EXT_ID =
14138) LBC
ON LS.HL_DB = LBC.HL_DB
AND (LS.HL_TABLE IS NULL OR LS.HL_TABLE = LBC.HL_TABLE
AND (LS.HL_PARTITION IS NULL OR LS.HL_PARTITION = LBC.HL_PARTITION))
WHERE LBC.HL_LOCK_TYPE='e'
OR LBC.HL_LOCK_TYPE='w' AND LS.HL_LOCK_TYPE IN ('w','e')
OR LBC.HL_LOCK_TYPE='r' AND (LS.HL_LOCK_TYPE='e' or LS.HL_LOCK_TYPE='w' and
LS.HL_LOCK_STATE='w');
{code}
> Rewrite checkLock inner select with JOIN operator
> -------------------------------------------------
>
> Key: HIVE-22888
> URL: https://issues.apache.org/jira/browse/HIVE-22888
> Project: Hive
> Issue Type: Improvement
> Components: Locking
> Reporter: Denys Kuzmenko
> Assignee: Denys Kuzmenko
> Priority: Major
> Attachments: HIVE-22888.1.patch, HIVE-22888.2.patch
>
>
> - Created extra (db, tbl, part) index on HIVE_LOCKS table;
> - Replaced inner select under checkLocks using multiple IN statements with
> JOIN operator;
> generated query looks like :
> {code}
> SELECT LS.* FROM (
> SELECT HL_LOCK_EXT_ID, HL_LOCK_INT_ID, HL_DB, HL_TABLE, HL_PARTITION,
> HL_LOCK_STATE, HL_LOCK_TYPE, HL_TXNID FROM HIVE_LOCKS
> WHERE HL_LOCK_EXT_ID < 14138) LS
> INNER JOIN (
> SELECT HL_DB, HL_TABLE, HL_PARTITION FROM HIVE_LOCKS WHERE HL_LOCK_EXT_ID
> = 14138) LBC
> ON LS.HL_DB = LBC.HL_DB
> AND (LS.HL_TABLE IS NULL OR LS.HL_TABLE = LBC.HL_TABLE
> AND (LS.HL_PARTITION IS NULL OR LS.HL_PARTITION = LBC.HL_PARTITION))
> WHERE LBC.HL_LOCK_TYPE='e'
> OR LBC.HL_LOCK_TYPE='w' AND LS.HL_LOCK_TYPE IN ('w','e')
> OR LBC.HL_LOCK_TYPE='r' AND (LS.HL_LOCK_TYPE='e' or LS.HL_LOCK_TYPE='w'
> and LS.HL_LOCK_STATE='w')
> LIMIT 1;
> {code}
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