Bug 1007005 - Transaction manager UUID generation (getPid) uses synchronized causing contention
Summary: Transaction manager UUID generation (getPid) uses synchronized causing conten...
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: JBoss Enterprise Application Platform 6
Classification: JBoss
Component: Transaction Manager
Version: 6.2.0
Hardware: All
OS: All
unspecified
high
Target Milestone: ER2
: EAP 6.2.0
Assignee: tom.jenkinson
QA Contact: Ondrej Chaloupka
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-09-11 17:29 UTC by Andrig T Miller
Modified: 2017-10-10 00:06 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2013-12-15 16:13:58 UTC
Type: Bug
Embargoed:

Attachments (Terms of Use)

Description Andrig T Miller 2013-09-11 17:29:13 UTC 
Description of problem:

In profiling SPECjEnterprise2010, we identified an issue in the transaction manager, where there was significant contention.

This was fixed upstream in 5.0, but needs to be backported into 4.17.10.Final.

Version-Release number of selected component (if applicable):

4.17.9

How reproducible:

Everytime.

Steps to Reproduce:
1.Use the UUID generation for transaction identification, which I believe is now the default in EAP.
2.
3.

Actual results:

Contention for the start of every transaction.

Expected results:

No contention in starting transactions, improving throughput.

Additional info:

Upstream issue:

https://issues.jboss.org/browse/JBTM-1907

Upstream commit:

https://github.com/jbosstm/narayana/commit/9e2531ab8519004dc76ba7f3a82c848c4982c10a
Comment 1 Andrig T Miller 2013-09-11 17:35:15 UTC 
Set the flags for inclusion for EAP 6.2.
Comment 3 tom.jenkinson 2013-09-13 19:53:17 UTC 
https://github.com/jbossas/jboss-eap/pull/406

(getting: For all JBoss bugs, it is mandatory to set the target milestone field to a non-empty value before a bug can be moved past the ASSIGNED state. i.e. to POST, MODIFIED, ON_DEV, ON_QA, VERIFIED or RELEASE_PENDING.)
Comment 6 Ondrej Chaloupka 2013-09-23 07:27:28 UTC 
Checked the decopiled code for 6.2.0.ER2.
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