Thanks for response Marc. Yes i also think for some reason changes are not getting picked up but not able to figure out why so.

ids.block-size is updated in config file of all janus nodes and after that all nodes are re-started. 

In code i have only one method which is used to create janus-instance and same is passed to method for node/edge creation.

Yes IDS_BLOCK_SIZE  is equals "ids.block-size".

Thanks,
Anjani