[teiid-issues] [JBoss JIRA] (TEIID-4029) After terminating long running queries remains CPU load > 100% on JBoss java process
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https://issues.jboss.org/browse/TEIID-4029?page=com.atlassian.jira.plugin...
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Kylin Soong commented on TEIID-4029:
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After some investigation, I think the issue caused by wrong operation in design time with
Teiid Designer.
Customer want to merge/union two tables, but not trigger the union, I guess if design
correct, there should be SQL like
{code}
SELECT a."1", a."2", a."3", a."4",
a."5", a."6", a."7", a."8", a."9",
a."10", a."11", a."12", a."13", a."14",
a."15", a."16", a."17", a."18", a."19",
a."20" FROM ViewModel.csv1 AS a UNION ALL SELECT b."1",
b."2", b."3", b."4", b."5", b."6",
b."7", b."8", b."9", b."10", b."11",
b."12", b."13", b."14", b."15", b."16",
b."17", b."18", b."19", b."20" FROM ViewModel.csv2
AS b;
{code}
In my test, "select * from combinedcsv" will continue several mins due to
Printstream output, but "select count(*) from combinedcsv" will get result in
several seconds.
After terminating long running queries remains CPU load > 100% on
JBoss java process
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Key: TEIID-4029
URL: https://issues.jboss.org/browse/TEIID-4029
Project: Teiid
Issue Type: Bug
Components: Server
Affects Versions: 8.7.4
Reporter: Colin Mondesir
Assignee: Steven Hawkins
Fix For: 8.12.x
Attachments: Archive.zip, Case01593403.java, heap.1, heap.2, heap.3, heap.4,
heap.5, highcpu-vdb.xml
Once the request is submitted the CPU% load on the server remains > 100% despite
cancelling the request and terminating the session. The only way I have found to bring the
%CPU back to "normal" is to re-start the JDV instance.
1. Created two files file1.csv (1M rows) and file2.csv (1M rows)
2. Created two source and view models and VDB
SQL statement is a carthesion product
3. Deploy VDB
4. select * from combinedcsv from SQL scrapbook on cancelLongRunningQueries VDB
5. Goto admin console
6. Go to the cancelLongRunningQueries VDB
7. Goto tab Requests and select Terminate
8. Goto tab Sessions and select Terminate JDBC session
9. CPU% load on JBoss java process remains > 100%
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