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Upgrading M3

Overview

This guide explains how to upgrade M3 from one version to another (e.g. from 0.14.0 to 0.15.0). This includes upgrading:

  • m3dbnode
  • m3coordinator
  • m3query
  • m3aggregator

m3dbnode

Graphs to monitor

While upgrading M3DB nodes, it's important to monitor the status of bootstrapping the individual nodes. This can be monitored using the M3DB Node Details dashboard. Typically, the Bootstrapped graph under Background Tasks and the graphs within the CPU and Memory Utilization give a good understanding of how well bootstrapping is going.

Kubernetes

If running M3DB on Kubernetes, upgrade by completing the following steps.

  1. Identify the version of m3dbnode to upgrade to on Quay.

  2. Replace the Docker image in the StatefulSet manifest (or m3db-operator manifest) to be the new version of m3dbnode.

spec:
  image: quay.io/m3db/m3dbnode:$VERSION
  1. Once updated, apply the updated manifest and a rolling restart will be performed. You must wait until the StatefulSet is entirely upgraded and bootstrapped (as per the M3DB Node Details dashboard) before proceeding to the next StatefulSet otherwise multiple replicas will be unavailable at once.
kubectl apply -f <m3dbnode_manifest>

Downgrading

The upgrading steps above can also be used to downgrade M3DB. However, it is important to refer to the release notes to make sure that versions are backwards compatible.

m3coordinator

m3coordinator can be upgraded using similar steps as m3dbnode, however, the images can be found here instead.

m3query

m3query can be upgraded using similar steps as m3dbnode, however, the images can be found here instead.

m3aggregator

m3aggregator can be upgraded using similar steps as m3dbnode, however, the images can be found here instead.

Non-Kubernetes

It is very important that for each replica set, only one node gets upgraded at a time. However, multiple nodes can be upgraded across replica sets.

1) Download new binary (linux example below).

wget "https://github.com/m3db/m3/releases/download/v$VERSION/m3_$VERSION_linux_amd64.tar.gz" && tar xvzf m3_$VERSION_linux_amd64.tar.gz && rm m3_$VERSION_linux_amd64.tar.gz

2) Stop and upgrade one M3DB node at a time per replica set using the systemd unit.

# stop m3dbnode
sudo systemctl stop m3dbnode

# start m3dbnode with the new binary (which should be placed in the path specified in the systemd unit)
sudo systemctl start m3dbnode

Note: If unable to stop m3dbnode using systemctl, use pkill instead.

# stop m3dbnode
pkill m3dbnode

# start m3dbnode with new binary
./m3_$VERSION_linux_amd64/m3dbnode -f <config-name.yml>

3) Confirm m3dbnode has finished bootstrapping.

20:10:12.911218[I] updating database namespaces [{adds [default]} {updates []} {removals []}]
20:10:13.462798[I] node tchannelthrift: listening on 0.0.0.0:9000
20:10:13.463107[I] cluster tchannelthrift: listening on 0.0.0.0:9001
20:10:13.747173[I] node httpjson: listening on 0.0.0.0:9002
20:10:13.747506[I] cluster httpjson: listening on 0.0.0.0:9003
20:10:13.747763[I] bootstrapping shards for range starting ...
...
20:10:13.757834[I] bootstrap finished [{namespace metrics} {duration 10.1261ms}]
20:10:13.758001[I] bootstrapped
20:10:14.764771[I] successfully updated topology to 3 hosts

4) Repeat steps 2 and 3 until all nodes have been upgraded.