Can I run upgrade sstables on many nodes on one time

[Ola Nowak <ol...@gmail.com>]

Hi all,
I'm trying to update my 6 node cluster from 2.0.11 to 2.1.8.
I'm following this update procedure:
http://docs.datastax.com/en/upgrade/doc/upgrade/cassandra/upgradeCassandraDetails.html
and the point 8 says: "If you are upgrading from a major version (for
example, from Cassandra 1.2 to 2.0) or a major point release (for example,
from Cassandra 2.0 to 2.1), upgrade the SSTables on each node.
$ nodetool upgradesstables"
As far as I understood it correctly I should run nodetool upgradesstables
on every node after upgrading the version on each node. Is that right?
As it is a really time consuming operation I wonder if I could run
upgradesstables on multiple nodes at one time ( parallelly)?
Regards,
Ola

RE: Can I run upgrade sstables on many nodes on one time

[SE...@homedepot.com]

Yes, you should run upgradesstables on each node. If the sstable structure has changed, you will need this completed before you can do streaming operations like repairs or adding nodes.

As for running in parallel, that should be fine. It is a “within the node” operation that pounds I/O (but is capped by compaction threshold). You need to look at the level of activity from normal operations, though. If Cassandra is running without much stress/sweat, go ahead and run 2 at once. (Conservatively, that’s all I would do on 6 nodes.) If the cluster is inactive, let it fly on all nodes.


Sean Durity
Lead Cassandra Admin, Big Data Team

From: Ola Nowak [mailto:ola.nowak88@gmail.com]
Sent: Thursday, August 13, 2015 5:30 AM
To: user@cassandra.apache.org
Subject: Can I run upgrade sstables on many nodes on one time

Hi all,
I'm trying to update my 6 node cluster from 2.0.11 to 2.1.8.
I'm following this update procedure: http://docs.datastax.com/en/upgrade/doc/upgrade/cassandra/upgradeCassandraDetails.html and the point 8 says: "If you are upgrading from a major version (for example, from Cassandra 1.2 to 2.0) or a major point release (for example, from Cassandra 2.0 to 2.1), upgrade the SSTables on each node.
$ nodetool upgradesstables"
As far as I understood it correctly I should run nodetool upgradesstables on every node after upgrading the version on each node. Is that right?
As it is a really time consuming operation I wonder if I could run upgradesstables on multiple nodes at one time ( parallelly)?
Regards,
Ola


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