dlmarion commented on PR #3220:
URL: https://github.com/apache/accumulo/pull/3220#issuecomment-1468700646
If you want to test this yourself, you can:
1. Build Accumulo from PR
[38](https://github.com/dlmarion/accumulo/pull/38)
2. Set the following properties in accumulo.properties:
```
manager.tablet.watcher.interval=15s
table.ondemand.tablet.unloader.interval=1m
table.custom.ondemand.unloader.inactivity.threshold=120000
```
3. Start up local instance
4. Log into Accumulo shell, and do the following
```
createtable test
```
> **Note**
> notice test and 1 tablet in Monitor
> notice "loc" column in tablet metadata
```
ondemand test
```
> **Note**
> notice 0 tablets in monitor
> notice "loc" missing from tablet metadata
```
insert a b c d
```
> **Note**
> notice shell command wait for tablet to be hosted
> notice 1 tablet in Monitor
> notice "loc" column in tablet metadata
> notice "ondemand" column in tablet metadata
```
addsplits m - test
```
> **Note**
> notice 1 tablet in Monitor
> notice "loc" in tablet metadata for source tablet only
> notice "ondemand" column in tablet metadata for source tablet only
```
sleep 240
```
> **Note**
> table.custom.ondemand.unloader.inactivity.threshold is set to 2m,
waiting 4m should unload the tablet
> notice 0 tablets in monitor
> notice "loc" column missing in tablet metadata
> notice "ondemand" column missing in tablet metadata
```
insert a b c d
```
> **Note**
> notice shell command wait for tablet to be hosted
> notice 1 tablet in Monitor
> notice "loc" column in tablet metadata
> notice "ondemand" column in tablet metadata
5. Stop Accumulo
6. Start Accumulo
> **Note**
> test tablet had "ondemand" column on shutdown, so it gets re-hosted
> notice 1 tablet in Monitor
> notice "loc" column in tablet metadata
> notice "ondemand" column in tablet metadata
7. Wait a few minutes for tablet to be unloaded
> **Note**
> notice 0 tablets in monitor
> notice "loc" column missing in tablet metadata
> notice "ondemand" column missing in tablet metadata
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