Task Status Commands (OLAP)

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OLAP REST Commands: Task Management Commands

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Doradus OLAP applications use background tasks to perform data aging. These tasks execute automatically at their defined frequency. On multi-node clusters, Doradus ensures that each data-aging task is executed by only a single node at each scheduled occurrence. The following REST command is available to list the status of all known tasks:

GET /_tasks

This command returns a response such as the following:

<tasks>
    <task name="Msgs/Message/data-aging">
        <Executor>127.0.0.1</Executor>
        <FinishTime>2015-02-11 14:12:32</FinishTime>
        <StartTime>2015-02-11 14:12:32</StartTime>
        <Status>Completed</Status>
    </task>
    <task name="OLAPEvents/*/data-aging">
        <Executor>127.0.0.1</Executor>
        <FinishTime>2015-02-11 14:11:31</FinishTime>
        <StartTime>2015-02-11 14:11:31</StartTime>
        <Status>Completed</Status>
    </task>
    <task name="Email/*/data-aging">
        <Executor>127.0.0.1</Executor>
        <FinishTime>2015-02-11 14:12:33</FinishTime>
        <StartTime>2015-02-11 14:12:33</StartTime>
        <Status>Completed</Status>
    </task>
</tasks>

In JSON:

{"tasks": {
    "Msgs/Message/data-aging": {
        "Executor": "127.0.0.1",
        "FinishTime": "2015-02-11 14:12:32",
        "StartTime": "2015-02-11 14:12:32",
        "Status": "Completed"
    },
    "OLAPEvents/*/data-aging": {
        "Executor": "127.0.0.1",
        "FinishTime": "2015-02-11 14:11:31",
        "StartTime": "2015-02-11 14:11:31",
        "Status": "Completed"
    },
    "Email/*/data-aging": {
        "Executor": "127.0.0.1",
        "FinishTime": "2015-02-11 14:12:33",
        "StartTime": "2015-02-11 14:12:33",
        "Status":"Completed"
    }
}}

The status of each task is listed using the task name <application>/<table>/data-aging. For OLAP applications, the <table> name is “*”. The status, start time, and finish time is shown. The “Executor” is the IP address if the Doradus node that performed the task.