Component status indicators
EMM can configure, start and stop components. For all the components it manages, EMM can monitor execution and automatically restart in case of failure (re-initializing where applicable).
As components are managed, their icons in the Navigation Pane will change to indicate their status. Although the base icons for a correlator and an IAF adapter are different, being
and
, they have the same set of symbols overlaid on them to indicate their state. Using the correlator’s icons as an example, the indicated states are:
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UNKNOWN. The state is still unknown, i.e. EMM is trying to communicate with the component.
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STOPPED. The component is not running and it is not supposed to be, that is, it has not been started, or it was explicitly stopped, in EMM.
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RUNNING. The component is running normally and it is supposed to be, that is, it was started from EMM.
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STOPPING,
STARTING. A stop or start operation is in progress.
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WARN. This can mean one of the following:
The component is supposed to be running but is
not responding – EMM has lost contact with it and is trying to reestablish communication. If this does not succeed the component will progress to the
FAIL state.
The component itself started correctly but
one or more initialization actions failed. Use the component’s
Diagnostics tab to investigate where the problem occurred. The warning can be cleared by pressing the
Clear warning button on the
Diagnostics tab.
The component has been started but it is
not supposed to be running (e.g. it was started from outside EMM). The warning can be cleared by pressing the
Clear warning button on the
Diagnostics tab.
A correlator started on the local machine but there was no license file, so the component will automatically terminate after 30 minutes. The warning can be cleared by pressing the
Clear warning button on the
Diagnostics tab, however Apama recommends supplying a valid license and restarting the component.
The component itself started correctly but one or more
upstream connections to other components could not be established. Use the component’s
Diagnostics tab to investigate where the problem occurred. The warning can be cleared by pressing the
Clear warning button on the
Diagnostics tab.
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FAIL. The component has failed. The component stopped responding to EMM for the entire WARN timeout configured for the it plus the FAIL timeout, so EMM now assumes that the component is no longer running.
In case of a FAIL check the Diagnostics tab to discover which of these situations occurred.
Note: The time to wait after a component stops responding before entering the WARN state, and the time between entering the WARN state and progressing to FAIL may both be configured on a per-component basis using the Management tab in the Details Pane.