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From Hao Zhang <kennt...@gmail.com>
Subject Cassandra CDC updating
Date Fri, 11 Jan 2019 02:17:03 GMT
Hi All

I enabled CDC through yaml. When I insert 100k small rows, I don't see CDC
file being created or updated unless I restart cassandra service after each
update. However, when I insert rows with columns of 1MB, I started to see
CDC files added. I looked at commit log, they are updated in a timely
fashion. It is as if CDC won't update for smaller rows. I am running
following version. Also, I used nodetool flush to see if it has any impact.
What I observed is that it will speed up CDC log update in larger row case
but no impact on small rows. I thought flush is about flushing memtable to
sstable, it shouldn't impact latency of commit log and CDC? Thanks


cqlsh> show version
[cqlsh 5.0.1 | Cassandra 3.11.3 | CQL spec 3.4.4 | Native protocol v4]

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