Fixes are available
APAR status
Closed as program error.
Error description
When using transaction isolation with PESSIMISTIC LockStrategy to avoid deadlocks on the primary shard, LockTimeoutException due to deadlocks can be seen when using synchronous replication.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere eXtreme Scale who * * use Read Committed or Read Uncomitted * * transaction isolation level with * * replication enabled. * **************************************************************** * PROBLEM DESCRIPTION: A LockTimeoutException exception * * occurs on a synchronous replica shard. * **************************************************************** * RECOMMENDATION: * **************************************************************** When a Read committed or Read uncommitted isolation level is used with pessimistic locking on a primary shard, deadlocks are avoided when fetches are performed in mixed order. With replication, the runtime uses Repeatable reads on the replica, which results in deadlocks. The runtime code was modified so that locks are no longer otained for fetch operations on a replica shard.
Problem conclusion
A future cumulative fix will correct the problem.
Temporary fix
Comments
APAR Information
APAR number
PM17689
Reported component name
XD VIRTUAL ENTE
Reported component ID
5724J3403
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2010-07-01
Closed date
2010-08-05
Last modified date
2010-08-05
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
XD EXTREME SCAL
Fixed component ID
5724J3402
Applicable component levels
R610 PSY
UP
R700 PSY
UP
R710 PSY
UP
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Document Information
Modified date:
23 September 2020