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https://issues.apache.org/jira/browse/HAWQ-512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15189082#comment-15189082
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ASF GitHub Bot commented on HAWQ-512:
-------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/incubator-hawq/pull/431
> Query hang due to deadlock in entrydb catalog access
> ----------------------------------------------------
>
> Key: HAWQ-512
> URL: https://issues.apache.org/jira/browse/HAWQ-512
> Project: Apache HAWQ
> Issue Type: Bug
> Components: Catalog
> Affects Versions: 2.0.0-beta-incubating
> Reporter: zhenglin tao
> Assignee: zhenglin tao
> Fix For: 2.0.0
>
>
> When entry database is involved in query with joins, it may hang due to
> deadlock while accessing catalog.
> {noformat}
> DROP TABLE IF EXISTS t;
> CREATE TABLE t (key INT, value INT) DISTRIBUTED RANDOMLY;
> INSERT INTO t VALUES (1, 0);
> CREATE OR REPLACE FUNCTION f()
> RETURNS VOID AS $$
> sql = """ALTER TABLE t SET DISTRIBUTED BY (key)"""
> plpy.execute(sql)
> sql = """INSERT INTO t
> SELECT t2.key, t2.value
> FROM
> (SELECT key, value FROM t WHERE value = 0) AS t1,
> (SELECT generate_series(1, 2)::INT AS key, 0::INT AS value )
> AS t2
> WHERE t1.value = t2.value """
> # plan = plpy.prepare(sql)
> plpy.execute(sql)
> $$
> LANGUAGE plpythonu VOLATILE;
> -- Call of function f() hangs here
> SELECT f();
> {noformat}
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