How configure table_properties_collectors using Properties in Java?

[ddupg]

My project is developed using Java and uses org.rocksdb.ColumnFamilyOptions#getColumnFamilyOptionsFromProps to set options for CFs, following this document[1], I want to set table_properties_collector_factories to NewCompactOnDeletionCollectorFactory.

I have tried various ways but none have worked.

Properties props = new Properties();
// various ways I tried
props.put("table_properties_collectors", "id=CompactOnDeletionCollector:window_size=100:deletion_trigger=90:deletion_ratio=0.5");
props.put("table_properties_collectors", "CompactOnDeletionCollector:100:90:0.5");

return ColumnFamilyOptions.getColumnFamilyOptionsFromProps(props);

Then I see this in the LOG, and the parameters are all default values of 0

2024/06/27-17:53:19.343124 6163738624                   Options.table_properties_collectors: CompactOnDeletionCollector (Sliding window size = 0 Deletion trigger = 0 Deletion ratio = 0);

So my question is, does table_properties_collector_factories support being set using Properties or option string? If it does, how should I write the code?

[1] https://github.com/.../Implement-Queue-Service-Using...

Expected behavior

Use Properties to set table_properties_collector_factories of ColumnFamilyOptions in Java. Expected see LOG

Options.table_properties_collectors: CompactOnDeletionCollector (Sliding window size = 100 Deletion trigger = 90 Deletion ratio = 0.5);

Actual behavior

See this in LOG

Options.table_properties_collectors: CompactOnDeletionCollector (Sliding window size = 0 Deletion trigger = 0 Deletion ratio = 0);

Steps to reproduce the behavior

[adamretter]

Entires in Properties get converted into a string like key=value;key=value;... by a call to Options#getOptionStringFromProps.

As Options#setTablePropertiesCollectorFactory expects a Java Object, I don't think you will be able to set that via a string.

[ddupg]

@adamretter Thank you for your reply. I found this PR that supports customizing the TablePropertiesCollectorFactory with a string, and I saw an option called "table_properties_collectors" here, but I'm not sure how it can be applied to convert Properties into Options in Java. Can you help me with this?

[adamretter]

@ddupg I think what you are looking at is the CreateFromString interface that was added not long ago by @mrambacher to the C++ API. We don't yet support that in RocksJava, as it wasn't really clear to me initially how we could support that. We could re-examine if it might be possible to support this (or an equivalent) in RocksJava if that is helpful? However, it will take some time to achieve that.

[ddupg]

@adamretter Thank you for your detailed response. Given this situation, I will attempt alternative methods. Looking forward to the day when this feature is available in RocksJava.