How to make hbase respect hregion.max.filesize for existent regions data?

Couple of things here, I think you should restart atleast the Hmaster to pick up the changed value. Also I have set the byte value, in your case it should be 4294967296 (4GB). I think after these changes Hbase should manually split the regions bigger than the specified max.filesize.

Or else you can also do a manual major_compact or even split.

Compaction merges StoreFiles, it doesn't merge regions.

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