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hkroger avatar hkroger commented on August 23, 2024

One of the reasons why it is so slow is the lack of caching/buffering on the driver side. If we use for example block size of 4096 and for some reason the FS is writing in chunks of 512, then we have to read out the block, update the block and write back the block 8 times before we are done and when all this is synchronous, it gets very slow.

So to solve this, it would be helpful to add some caching/buffering and make the FS driver more asynchronous when it writes to Cassandra.

If there is some level of caching, then there should be as well a method for invalidating those caches between cqlfs instances. Some sort of publish/subscribe mechanism is needed and Cassandra itself doesn't provide anything for so some centralized but distributed pub/sub merchanism would be needed.

from cqlfs.

MRYingLEE avatar MRYingLEE commented on August 23, 2024

Thank you very much.

Ying

from cqlfs.

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