Task Status Command

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.