© 2015 IBM Corporation

High Availability

IBM InfoSphere Streams Version 4.0

Steve Halverson

Senior Software Engineer

shalver@us.ibm.com

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Agenda

Domain High Availability

Instance High Availability

Questions

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High Availability

domain.highAvailabilityCount and instance.highAvailabilityCount

– Default value is 1

– Value = active + standby → 3 implies active(1) + standby(2)

Active Service

– Typically one service is active

• sws

– One for entire domain

• jmx

– At most one per resource

– All jmx services are active (for load distribution)

• hc/app

– Active service per resource

– At most 1 standby service per resource

Standby Services

– Waiting in a dormant state

– Spread across several systems or can be duplicated on single systems

– If active service fails, restore state and assume responsibilities

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Domain Controller

New service introduced in Version 4.0 (controller)

– Manages all services that run on a resource

Can be registered as a Linux system service

– Automatically starts when system boots

– Must have root authority to register/start/stop/unregister

Detect streams service failures

– Automatically restart services if they fail or are killed

– Leader controller monitors health of other controllers

Monitor streams service health

– Automatically quiesce services that appear to be unresponsive

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Domain Host Tags

Generic Placement

– management

• Resource eligible for all domain services unless explicit placement

Explicit Placement

– Take precedence over generic management tag

• authentication

– aas service

• audit

– auditlog service

• jmx

– jmx management service

• sws

– console/rest services

Recommendation is that resources are explicitly tagged

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Instance Host Tags

Generic Placement

– management

• Resource eligible for all instance services unless explicit placement

Explicit Placement

– view

• Take precedence over generic management tag

• view service

– application

• hc/app service

– Custom Tags

• auditlog service

Recommendation is that resources are explicitly tagged

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Demo

Create domain with high availability

Create instance with high availability

Tag resources for high availability

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SWS and JMX considerations

sws

– Need resource specific certificate

– Url is available using streamtool command

• streamtool geturl

– Each resource tagged for sws should be setup properly

– Console/rest urls can change if resource fails

jmx

– Urls are available using streamtool command

• streamtool getjmxconnect

– Jmx connect url can change if resources fails

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Questions?