Q&A On Cassandra Message Record Size And Index
(Doc ID 2829555.1)
Last updated on JANUARY 28, 2022
Applies to:Oracle Communications Messaging Server - Version 8.1.0 and later
Information in this document applies to any platform.
Q1. Regarding "FAQ On Cassandra-based Storage (Doc ID 2725838.1)", the answer to question #3 states:
"Messages of size < 100 MB are stored as a single record. Messages of size >100 MB are chunked into blobs of 100 MB and are stored as different records in the message table of ms_msg keyspace."
Would it be better to have a record size of something like 128k?
Q2. In this scenario, the hard-coded 100meg chunk size is failing because on the Cassandra side, there is a config option which is set to a much smaller value, per the "normal" way Cassandra is operated. Is there a config option which needs to have a higher-than-normal setting to allow for that to work?
Q3. Regarding the following:
cqlsh> desc table corp_mail_msg.message
would allow the client (the access tier system) to do a single request and receive all the chunks. What is the difference?
Q4. How many partitions are the chunks spread over?
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