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Amazon ElastiCache
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AMAZON ELASTICACHE MANAGED MAINTENANCE AND SERVICE UPDATES HELP PAGE
Page Content
Service Updates Continuous Managed Maintenance Updates
We frequently upgrade our Amazon ElastiCache fleet, with patches and upgrades
being applied to instances seamlessly. We do this in one of the two ways:
(a) continuous managed maintenance, and (b) service updates. These maintenance
and service updates are required to apply upgrades that strengthen security,
reliability, and operational performance.
Continuous managed maintenance happens from time to time and directly in your
maintenance windows without requiring any action from your end.
Service updates give you flexibility to apply them on your own. They are timed
and may be moved into the maintenance window to be applied by us after their due
date lapses.
You have the option to manage updates yourself at any time prior to the
scheduled maintenance window. When you manage an update yourself, your instance
will receive the OS update when you relaunch the node and your scheduled
maintenance window will be cancelled.
SERVICE UPDATES
Q: What are service updates in Amazon ElastiCache?
Service updates is a feature in Amazon ElastiCache that enables you to apply
certain service updates at your discretion. These updates can be of the
following types: security patches or minor software updates. These updates help
strengthen security, reliability, and operational performance of your clusters.
The value of these service updates is that you can control when to apply the
update (e.g., you can delay applying service updates when there is an important
business event that requires 24x7 availability of ElastiCache clusters).
For details of each service update, please refer to value of the "Update
Description" attribute.
Q: How do I get notified of an available ElastiCache service update?
When service updates applicable to your Memcached or Redis clusters become
available, we will notify you via several channels, including the Amazon
ElastiCache console, email, Amazon Simple Notification Service (SNS), AWS
Personal Health Dashboard, and Amazon CloudWatch events.
Q: How are updates applied in the maintenance window different from the service
updates?
Updates available via our continuous managed maintenance are separate than those
offered by service updates. Updates applied via continuous managed maintenance
are directly scheduled in your maintenance windows without any action needed
from your side. Service updates are timed and give you control on when you want
to apply by the “Recommended Apply by Date”. If they are still not applied by
then, ElastiCache may schedule these updates in your maintenance window.
Q: How do I determine whether I should apply the available service update?
If your ElastiCache Redis cluster is participating in a HIPAA, PCI, or FedRAMP
compliance program, you must apply service updates by their “Recommended Apply
by Date” in order to maintain compliance. For more information, please see
Self-Service Security Updates for Compliance.
For other clusters, we recommend that you apply service updates as per your
business cadence. Even if you are unable to apply a service update by its
“Recommended Apply by Date” you will be able to apply it until its “Update
Expiration Date”. However, the “Update Expiration Date” can change anytime
depending on the availability of new updates.
Q: What is the impact of applying a service update to ElastiCache for Redis
clusters? Will I lose data or connectivity to my clusters?
When you or Amazon ElastiCache applies a service update to one or more Redis
clusters, the update is applied to no more than one node at a time within each
shard until all selected clusters are updated. The nodes being updated will
experience downtime of few seconds, while the rest of the Redis cluster will
continue to serve traffic.
* There will be no change in the cluster configuration.
* You will see a delay in your CloudWatch metrics that catch up as soon as
possible.
Service updates are applied in the same way as “Continuous Managed Maintenance
Updates”, through node replacement. Please refer to the following questions in
the Continuous Managed Maintenance Updates section on this page for details
about how the update is applied and how to prepare your application to minimize
the impact.
* How does a node replacement impact my application?
* What best practices should I follow for a smooth replacement experience and
minimize data loss?
* What client configuration best practices should I follow to minimize
application interruption during maintenance?
Q: Is there downtime associated with applying the update to ElastiCache for
Memcached clusters?
Yes, the node is replaced by a new empty node. The cache contents will no longer
be there and will start fresh.
Q: Can I opt out of service updates?
You can determine if you can opt out of a service update by verifying that value
of “Auto-Update after Due Date” attribute. If the value of “Auto-Update after
Due Date” attribute of a service update is “no”, this service update can be
opted out of. However, if the value of “Auto-Update after Due Date” attribute of
a service update is “yes” and the recommended “Apply by Date” has passed,
ElastiCache will automatically schedule the service update to any remaining
clusters during an upcoming maintenance window. This automatic service update
will be scheduled before the "Update expiration date” and you will receive a
notification one week prior to the update with the scheduled time. We strongly
recommend applying security updates even if they can be opted out of. If you
choose to apply the service update to the remaining clusters prior to the
maintenance window, ElastiCache will not reapply the service update during the
maintenance window.
Q: Why can’t the service updates be directly applied by ElastiCache during
maintenance windows?
The purpose of service updates is to give you flexibility on when to apply them.
Clusters that are not participating in the ElastiCache-supported compliance
programs can choose to not apply these updates, or apply them at a reduced
frequency throughout the year. This is true only when the value of “Auto-Update
after Due Date” attribute of a service update is “no”. For more information, see
Can I opt out of service updates?
Q: Can I use service updates to opt out of Amazon ElastiCache service
maintenance and apply the available updates myself?
No, service updates are mutually exclusive to the continuous managed maintenance
updates applied directly by Amazon ElastiCache during your clusters’ maintenance
windows.
Q: Where is the list of all service update attributes?
A complete list of attributes and their descriptions is available in Applying
the Self-Service Updates.
Q: Do all service updates have the same timeline to apply?
To help determine how soon to apply the available service updates, you can refer
to the “Severity” service update attribute which has the following values (in
order of priority):
1. critical: Recommended to apply immediately (within 14 days or less)
2. important: Recommended to apply as soon as your business flow allows (within
30 days or less)
3. medium: Recommended to apply within 60 days or less
4. low: Recommended to apply within 90 days or less
For more details refer to our public documentation – Applying Updates.
Q: How often are service updates released?
Release schedule depends on the importance of the service updates.
Q: What is the "Service Update SLA Met" attribute?
This attribute reflects whether your cluster was updated by the “Recommended
Apply by Date”. If a service update is applied after the “Recommended Apply by
Date”, the attribute “Service Update SLA Met” is set to “no”.
This information is relevant for Amazon ElastiCache Redis clusters participating
in HIPAA, PCI, and FedRAMP compliance programs. For more information, please see
Self-Service Security Updates for Compliance.
Q: If I miss one or more service updates, will I be able to apply them later?
Yes. Unless noted otherwise in the service update “Description” attribute,
service updates are always cumulative: if you miss applying them by the “Update
Expiration Date”, they will be included in the next service update. Service
updates of type “security” fall under this cumulative category.
Q: Can I choose to apply a service update to specific nodes in an ElastiCache
cluster?
No, service updates are applied at the cluster level. If you cancel an ongoing
update, a cluster may have some nodes updated and some nodes not updated. In
this case, the cluster will continue to show up in the list of clusters to apply
the service update to. The cluster will continue to operate normally.
Q: Why did the update status for one or more nodes in my ElastiCache clusters
change from “not-applied” to “complete” even when I did not apply the service
update?
There are two cases when this may happen:
(a) If you missed applying the service update that was optional and the update
is now in “expired” status. Hence clusters participating in compliance programs
must always apply all the service updates.
(b) If your node(s) are replaced for any other reason, such as a planned
maintenance event or node failover, Amazon ElastiCache will provision new
node(s) with the latest service updates included.
In both cases, the cluster will continue to operate normally.
Q: What if I have nodes that I want to apply expired service updates to? Should
I wait for next service update?
New nodes contain all applicable service updates, so you can manually replace
the existing nodes that haven’t been updated to get the latest updates.
Q: Are service updates engine-specific?
Yes. A service update may be applicable to only Redis, only Memcached, or both
Redis and Memcached. You can look for the “Engine” and “Engine Version” service
update attributes to determine the scope of each update.
Q: Can I change the scheduled service update to a more suitable time? What
happens to the scheduled update if I change the maintenance window?
Yes, you can defer the service update by changing the maintenance window. The
scheduled update will only be applied to the cluster if the scheduled date
matches the cluster's maintenance window. Once you change the maintenance window
and the scheduled date has passed, the service update will be rescheduled to the
newly specified window in the following weeks. You will receive a new
notification one week before the new date has been reached.
Security at AWS is a shared responsibility. We strongly recommend that you apply
the update at the earliest.
Q: Why did I receive notifications for multiple updates for the same cluster? Do
I need to apply all of them?
Your cluster may be part of different service updates. Most of the updates do
not require you to apply them separately. Applying one update to your cluster
will mark the other updates as completed wherever applicable. You may need to
apply multiple updates to the same cluster separately if the status does not
change to “completed” automatically.
Q: How is service update scheduled and applied after "Recommended Apply By
Date?"
ElastiCache will schedule the service update on the remaining clusters after the
“Recommended Apply by Date” if the value of “Auto-Update after Due Date”
attribute is “yes.” The update will be scheduled in the cluster’s maintenance
window and you will receive a new notification one week in advance with the
scheduled date before the updates are applied.
Scheduled service update will be applied to the clusters in the same way as
“Continuous Managed Maintenance Updates.” Please refer to the following section
on the details of how the update is applied, how to change the scheduled update,
and how to prepare your application for a scheduled update to minimize the
impact.
Q: What will happen if the service update can not be applied to the entire
cluster within a single maintenance window?
To maintain cluster stability, ElastiCache applies updates to only one node at a
time within each shard. If the service update cannot be applied to the entire
cluster within a single maintenance window, it will be scheduled to continue in
the next ones. You will receive new notifications on the next scheduled date and
can prepare accordingly.
Q: Can I roll back the service update?
The customer cannot roll back the service update once it starts. If you find an
issue after applying a service update, please reach out to the AWS Support team.
CONTINUOUS MANAGED MAINTENANCE UPDATES
Q: What is a continuous managed maintenance update?
These updates are mandatory and applied directly in your maintenance windows
without any action needed from your side. These updates are separate than those
offered by service updates.
Q: How long does a node replacement take?
A replacement typically completes within a few seconds. The replacement may take
longer in certain instance configurations and traffic patterns. For example,
Redis primary nodes may not have enough free memory, and may be experiencing
high write traffic. When an empty replica syncs from this primary, the primary
node may run out of memory trying to address the incoming writes as well as sync
the replica. In that case, the master disconnects the replica and restarts the
sync process. It may take multiple attempts for replica to sync successfully. It
is also possible that replica may never sync if the incoming write traffic
continues to remains high.
Memcached nodes do not need sync, so their replacement completes faster,
irrespective of node sizes.
Q: How does a node replacement impact my application?
For Redis nodes, the replacement process is designed to make a best effort to
retain your existing data and requires successful Redis replication. For single
node Redis clusters, ElastiCache dynamically spins up a replica, replicates the
data, and then fails over to it. For replication groups consisting of multiple
nodes, ElastiCache replaces the existing replicas and syncs data from the
primary to the new replicas. If Multi-AZ with auto-failover is enabled,
replacing the primary triggers a failover to a read replica. For Redis Cluster
configurations that are set up to use Redis Cluster clients, and non-Cluster
configurations with auto failover enabled, the planned node replacements
complete while the cluster serves incoming write requests. If Multi-AZ is
disabled, ElastiCache replaces the primary and then syncs the data from a read
replica. The primary node is unavailable during this time, leading to longer
write interruption.
For Memcached nodes, the replacement process brings up an empty new node and
terminates the current node. The new node will be unavailable for a short period
during the switch. Once switched, your application may see performance
degradation while the empty new node is populated with cache data.
Q: What best practices should I follow for a smooth replacement experience and
minimize data loss?
For Redis nodes, the replacement process is designed to make a best effort to
retain your existing data and requires successful Redis replication. We try to
replace just enough nodes from the same cluster at a time to keep the cluster
stable. You can provision primary and read replicas in different availability
zones. In this case, when a node is replaced, the data will be synced from a
peer node in a different availability zone. We also recommend that you upgrade
your Redis engine version to 5.0.6 or higher as those engine versions have
improved stability and enable your clusters to continuously serve incoming write
requests during patching activities if they have auto-failover enabled. Finally,
if your configuration includes only one primary and one single replica per
shard, we recommend adding additional replicas prior to the patching. This will
prevent reduced availability and risk during the patching process. For single
node Redis clusters, we recommend that sufficient memory is available to Redis,
as described here. For Redis replication groups with multiple nodes, we also
recommend scheduling the replacement during a period with low incoming write
traffic.
For Memcached nodes, schedule your maintenance window during a period with low
incoming write traffic, test your application for failover and use the
ElastiCache provided "smarter" client. You cannot avoid data loss as Memcached
has data purely in memory.
Q: What client configuration best practices should I follow to minimize
application interruption during maintenance?
For Redis, Cluster mode configuration has the best availability during managed
or unmanaged operations and it is always recommended to use a cluster mode
supported client which connects to the cluster discovery endpoint. For cluster
mode disabled, it is recommended to always use the primary endpoint for all the
write operations. The individual node endpoints of the replica nodes can be used
for all the read operations. If auto-failover is enabled in the cluster, primary
node may change, therefore, the application should confirm the role of the node
and update all the read endpoints to ensure that you aren't causing a major load
on the master. With auto failover disabled, the role of the node will not
change, however the downtime in managed or unmanaged operations is higher as
compared to clusters with auto failover enabled. Avoid directing read requests
to read replicas only. If you configure your client to direct read requests to
read replicas only, ensure that you have at least two read replicas to avoid any
read interruption during maintenance.
Q: How do I manage node replacements on my own?
We recommend that you allow ElastiCache to manage your node replacements for you
during your scheduled maintenance window. You can specify your preferred time
for replacements via the weekly maintenance window when you create an
ElastiCache cluster. For changing your maintenance window to a more convenient
time later, you can use the ModifyCacheCluster API or click on Modify in the
ElastiCache Management Console.
If you choose to manage the replacement yourself, you can take various actions
depending on your use case and cluster configuration:
• Change the Maintenance Window.
• Re-launch your Redis instance using Backup & Restore process.
• If your Redis cluster configuration is Cluster Mode Disabled
o Replace a read-replica (Cluster-Mode Disabled) – A procedure to manually
replace a read-replica in a Redis replication group.
o Replace the primary node (Cluster-Mode Disabled) – A procedure to manually
replace the primary node in a Redis replication group.
o Replace a standalone node (Cluster-Mode Disabled) – Two different procedures
to replace a standalone Redis node.
• If your Redis cluster configuration is Cluster Mode Enabled
o Replace a node in cluster with one or more shards – You can either use backup
and restore or scale-out followed by a scale-in to replace the nodes.
For more instructions on all these options see Actions You Can Take When a Node
is Scheduled for Replacement page.
For Memcached, you can just delete and re-create the clusters. Post replacement,
your instance should no longer have a scheduled event associated with it.
Q: How do I find out about upcoming scheduled replacements?
To receive notifications, you can set up Amazon SNS notifications for
significant events such as a scheduled replacement event. This can be achieved
via the ElastiCache Management Console, under the Events section, or by using
the describe-events API to check for the upcoming
ElastiCache:NodeReplacementScheduled event.
For setting up SNS notifications use the information provided here.
Q: Can I change the scheduled maintenance at a more suitable time?
Yes, you can change your cluster’s maintenance window. For changing your
maintenance window to a more convenient time later, you can use the API
(ModifyCacheCluster or ModifyReplicationGroup) or click on Modify in the
ElastiCache Management Console.
Once you change your maintenance window, ElastiCache service will schedule your
node for maintenance during the newly specified window. Please see examples on
how the changes take effect below.
For example,
Let's say, currently it's Thursday, 11/09, at 1500 and the next maintenance
window is Friday, 11/10, at 1700. Following are 3 scenarios with their outcomes:
• You change your maintenance window to Friday at 1600 (after the current date
time and before the next scheduled maintenance window). The node will be
replaced on Friday, 11/10, at 1600.
• You change your maintenance window to Saturday at 1600 (after the current date
time and after the next scheduled maintenance window). The node will be replaced
on Saturday, 11/11, at 1600.
• You change your maintenance window to Wednesday at 1600 (earlier in the week
than the current date time). The node will be replaced next Wednesday, 11/15, at
1600.
Q: Why are you doing these node replacements?
These replacements are needed to apply mandatory software updates to your
underlying host. The updates help strengthen our security, reliability, and
operational performance.
Q: Do these replacements affect my nodes in Multiple Availability Zones at the
same time?
We may replace multiple nodes from the same cluster depending on the cluster
configuration while maintaining cluster stability. For Redis sharded clusters,
we try not to replace multiple nodes in the same shard at a time. In addition,
we try not to replace majority of the master nodes in the cluster across all the
shards.
For non-sharded clusters, we will attempt to stagger node replacements over the
maintenance window as much as possible to continue maintaining cluster
stability.
Q: Can the nodes in different clusters from different regions be replaced at the
same time?
Yes, it is possible that these nodes will be replaced at the same time, if your
maintenance window for these clusters is configured to be the same.
Learn more about Amazon ElastiCache pricing
Visit the pricing page
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