[rrd4j] historicState() utility fails in very recent time

[Rossko57]

RRD4J is typically set up with everyMinute persist strategies.

Requesting a historicState() with a target time more recent than actual "most recent" record results in a null return.
Expected behaviour - return most recent record.

Demo (Item is just a Number type persisted everyMinute) -

var xx = nm_Out_temp.historicState(now.minusSeconds(65), "rrd4j")
logInfo("TTEST", "Test Result 65: " + xx.state.toString + " " + xx.getTimestamp.toString)
xx = nm_Out_temp.historicState(now.minusSeconds(40), "rrd4j")
logInfo("TTEST", "Test Result 40: " + xx.state.toString + " " + xx.getTimestamp.toString)
xx = nm_Out_temp.historicState(now.minusSeconds(1), "rrd4j")
logInfo("TTEST", "Test Result 1: " + xx.state.toString + " " + xx.getTimestamp.toString)

sample results, which will vary depending on run time.

2021-01-24 19:12:29.263 [INFO ] [eclipse.smarthome.model.script.TTEST] - Test Result 65: 0.4 Sun Jan 24 19:11:00 GMT 2021
2021-01-24 19:12:29.272 [INFO ] [eclipse.smarthome.model.script.TTEST] - Test Result 40: 0.4 Sun Jan 24 19:11:00 GMT 2021
2021-01-24 19:12:29.277 [ERROR] [ntime.internal.engine.RuleEngineImpl] - Rule 'test operation': cannot invoke method public abstract org.eclipse.smarthome.core.types.State org.eclipse.smarthome.core.persistence.HistoricItem.getState() on null

There might be a clue in this surprising random result, where the -40 seconds request appears to have seeked forward in time. Rounding going on?

2021-01-24 19:13:04.528 [INFO ] [eclipse.smarthome.model.script.TTEST] - Test Result 65: 0.4 Sun Jan 24 19:11:00 GMT 2021
2021-01-24 19:13:04.532 [INFO ] [eclipse.smarthome.model.script.TTEST] - Test Result 40: 0.4 Sun Jan 24 19:13:00 GMT 2021
2021-01-24 19:13:04.535 [INFO ] [eclipse.smarthome.model.script.TTEST] - Test Result 1: 0.4 Sun Jan 24 19:13:00 GMT 2021

May be related to NaN issue
openhab/openhab1-addons#5965

[openhab-bot]

This issue has been mentioned on openHAB Community. There might be relevant details there:

https://community.openhab.org/t/historicstate-with-rrd4j-in-oh3-returns-null/115263/8

[openhab-bot]

This issue has been mentioned on openHAB Community. There might be relevant details there:

https://community.openhab.org/t/persistence-maximumsince-different-type-returned-depending-on-timespan/133716/5

[lsiepel]

From the pull requests created after this issue was raised i don't see one that looks like a clear fix, but it would be nice if this can be confirmed. Also this post from Rich seems ot have usefull information.