[GitHub] [james-project] Arsnael commented on a change in pull request #597: JAMES-3631 Migration strategy for Cassandra mailRepository

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Arsnael commented on a change in pull request #597:
URL: https://github.com/apache/james-project/pull/597#discussion_r689213494



##########
File path: upgrade-instructions.md
##########
@@ -55,7 +56,49 @@ rolling upgrade with an empty mailqueue.
 
 To achieve an empty mailqueue, start a James server with SMTP and JMAP ports not exposed:
 they will consume existing mails without creating new ones.
+ 
+### Removal of old tables for Cassandra mailRepository
+
+Date 13/08/2021
+
+JIRA: https://issues.apache.org/jira/browse/JAMES-3631
+
+Concerned products: Cassandra James, only for installation performed in 2018 or before (3.4.0).
+
+To audit if you need to perform this upgrade run on a Cassandra server:
+
+```
+nodetool tablestats KEYSPACE mailrepositorycontent
+```
+
+A non-zero value in the key estimates means you need to perform a migration.
+
+Migrating content of `mailrepositorycontent` table needs to be done prior a rolling upgrade. After the rolling upgrade 
+the table can be removed.
+
+In order to move content of the `mailrepositorycontent` table to `mailrepositorycontentv2` table for ``:

Review comment:
       ```suggestion
   In order to move content of the `mailrepositorycontent` table to `mailrepositorycontentv2` table:
   ```




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