CHart displays one item correctly, another one not

Add-ons Persistence Services
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1

Hi,

I setup mapdb, rrd4j and influxdb according to the article Design Pattern: Group Based Persistence of @rlkoshak

Now I have different items that I are displayed in a chart, several are not displayed.
Here is one sample for each of them:

  1. WORKS

    // Persistence Groups
    Group gMyOpenhab // for Items that are exposed to IFTTT
    Group gChart // for Items to persist for charting
    Group gHistory // for Items to preserve their history
    //Group gRestore // for Items to restore on startup (currently everything so commented out)

    // To choose a proper chart period in a sitemap
    // mappings=[0=“Tag”, 1=“Woche”, 2=“Monat”, 3=“Jahr”]
    Number chart_period “Graph Zeitraum”

    // Wetter
    Group gChartWeather “Wetterdaten”
    Number Temperature “Temperature Outside” (gChart, gChartWeather) { channel=“yahooweather:weather:munich:temperature” }

Sitemap:
Chart item=Temperature period=D refresh=30000 visibility=[chart_period==0, chart_period==“Uninitialized”]

It works with rrd4j and influxdb

  1. WORKS NOT

    Number SpeedtestResultPing “Ping [%.3f ms]” (gHistory)
    Number SpeedtestResultDown “Downlink [%.2f Mbit/s]” (gChart, gChartSpeedtest)

Sitemap:
Chart item=SpeedtestResultDown period=D refresh=30000 visibility=[chart_period==0, chart_period==“Uninitialized”]

But data is recorded for both items, and I cannot see any difference why it works for the one but not for the other.

select * from Temperature
name: Temperature
time value

1492291089204000000 8
1492291256414000000 8
1492291856486000000 8

select * from SpeedtestResultDown
name: SpeedtestResultDown
time value

1492291291008000000 41.09
1492291443281000000 41.09
1492293617085000000 38.15

Thankful for any ideas
Cheers MArkus

2

Show your .persist files

3

// rrd4j.persist file: I use rrd4j for historic data. Because of limitations of rrd4j data must be saved at least every minute for charting or else you end up
// with blank charts and previousState and historicState do not appear to work.

Strategies {
// for rrd charts, we need a cron strategy
everyMinute : “0 * * * * ?”

    default = everyChange

}

Items {
// additionally persist weather info every minute
gHistory* : strategy = everyUpdate, everyMinute
// gChart* : strategy = everyUpdate, everyMinute
}

// influxdb.persist file: I use InfluxDB along with Grafana for generating complex and attractive charts. See the InfluxDB+Grafana tutorial28 for details.
// persistence strategies have a name and a definition and are referred to in the “Items” section

Strategies {
default = everyChange
}

Items {
gChart* : strategy = everyUpdate
}

// mapdb.persist file: I only use MapDB for restoreOnStartup and restoreOnStartup applies to all Items

Strategies {
default = everyUpdate
}

Items {
// persist all items on every change and restore them from the db at startup
* : strategy = everyChange, restoreOnStartup
}

4

Now when I stored everything in rrd4j all charts work.

So obviously the chart didnt work with influxdb, but I checked the data was written to influxdb.
Is there any config I need to do to tell the charts to use influxdb?

5

There shoudn’t be. Note that if influxdb is not your default persistence engine, you need to provide it in your Chart element on the sitemap.

Chart item=Temperature period=D refresh=30000 service="influxdb" visibility=[chart_period==0, chart_period=="Uninitialized"]

Otherwise, it tries to use whatever is the default persistence which probably doesn’t have these Items in it to chart.

6

thanks a lot, now it seems obvious to me…