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%%(color:red;)__Beta Document for v2.1__%%
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__Table of Contents__
__Contents__
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When the IEP SE is implemented in a clustered environment and one engine fails, any in-process transactions are taken over by one of the remaining engines and the process is completed. When the failed engine recovers, it continues to process new requests. The IEP SE uses a database to maintain instance information in a cluster. Inbound messages are distributed among the processors in the cluster.
The IEP SE uses a database to maintain instance information in a cluster. In a clustered environment, an event processor belongs to any one of the live cluster instances at a given time. All instances can receive the incoming messages, and once a message is received it is inserted into the IEP database for further processing. The instance that owns the event processor picks up the event to complete processing. The output is only written by the instance that owns the event processor. If an instance fails, any in-process transactions are taken over by one of the remaining instances and the process is completed. When the failed engine recovers, it continues to process new requests.
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*** {{Host}} (can be \\
*** {{Host}} (can be {{localhost}})\\
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## Under General – Configure Component, specify a value for the Lease Renewal Interval. \\__Note -__ The Lease Renewal Interval is the time period in seconds that BPEL engines wait before renewing their lease to let the cluster know it is still running (also known as the ''heartbeat''). If an engine does not update within the specified time period, it is considered to be unavailable.\\
## Under General – Configure Component, specify a value for the Lease Renewal Interval. \\__Note -__ The Lease Renewal Interval is the time period in seconds that IEP engines wait before renewing their lease to let the cluster know it is still running (also known as the ''heartbeat''). If an engine does not update within the specified time period, it is considered to be unavailable.\\
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This page (revision-25) was last changed on 08-Jun-09 15:35 PM, -0700 by CarolT