3.0.1 Release Note - MB-15345 CBBackup issues in 3.0.1 CE

We need to release note MB-15345 - CBBackup issues in 3.0.1 CE under 3.0.1 Release Notes.

Known Issues -
MB-15345 - CBBackup issues in 3.0.1 CE
Description - If you’re trying to backup large dataset and hit any performance regressions or high memory consumption with CBBackup tool in 3.0/3.0.1 CE.
To mitigate this issue you can follow the following workarounds to mitigate the issue -

Steps:

Grab cbbackupwrapper patch from S3:

> wget https://s3.amazonaws.com/support.couchbase.com/CBBackup-Patch/orig.patch

Apply the patch to file /opt/couchbase/lib/python/cbbackupwrapper:

> patch -p1 < orig.patch

This patch enables --sequential flag, which basically controls limits
the amount of backfills we do while performing backup.

Sample command:

> /opt/couchbase/bin/cbbackupwrapper http://<cluster-ip>:8091 <backup_dir> -u <username> -p <password> --path /opt/couchbase/bin/ —sequential -n <no_vbucket_per_batch>

Note: Important thing to note here is the number you're passing to -n flag, which controls the number of vbuckets to backfill at a time. You should tune it according to memory headroom you have on your couchbase node(by default, batch size is 100).