Amazon Neptune Engine Version (2020-10-12) - Amazon Neptune

Amazon Neptune Engine Version (2020-10-12)

As of 2020-10-12, engine version is being generally deployed. Please note that it takes several days for a new release to become available in every region.

Subsequent Patch Releases for This Release

New Features in This Engine Release

  • Added frame-level compression for Gremlin.

Improvements in This Engine Release

  • Amazon Neptune now requires the use of the Secure Sockets Layer (SSL) with the TLSv1.2 protocol for all connections to Neptune in all regions, using these strong cipher suites:







    This is true for both REST and WebSocket connections to Neptune, and means that you must use HTTPS rather than HTTP when connecting to Neptune in all regions.

    Because client connections using HTTP or TLS 1.1 will no longer be supported anywhere, please make sure that your clients and code have been updated to use TLS 1.2 and HTTPS before upgrading to this engine release.


Having to use SSL/TLS for all connections to Neptune can be a breaking change. It affects your connections with the Gremlin console, the Gremlin driver, Gremlin Python, .NET, nodeJs, REST APIs, and also load-balancer connections. If you have been using HTTP for any or all of these, you must now update the relevant client and drivers and change your code to use HTTPS or your connections will fail.

A bug in this release has allowed HTTP connections and/or outdated TLS connections to continue to work for customers who previously set a DB cluster parameter to prevent enforcement of HTTPS connections. That bug was fixed in patch releases and, but the fix has caused unexpected connection failures when the patches are automatically installed.

For this reason, both patches have been reverted, and can only be installed manually, to give you a chance to update your setup for TLS 1.2.

  • Upgraded TinkerPop to version 3.4.8. This is a backwards compatible upgrade. See the TinkerPop change log for what's new.

  • Improved performance for the Gremlin properties() step.

  • Added details about BindOp and MultiplexerOp in explain and profile reports.

  • Added data prefetch to improve performance when there are cache misses.

  • Added a new allowEmptyStrings setting in the bulk loader's parserConfiguration parameter that allows empty strings to be treated as valid property values in CSV loads (see Neptune Loader Request Parameters).

  • The loader now allows an escaped semicolon in multivalue CSV columns.

Defects Fixed in This Engine Release

  • Fixed a potential Gremlin memory leak related to the both() step.

  • Fixed a bug where request metrics were missing because an endpoint ending in '/' was not being handled correctly.

  • Fix a bug that caused replicas to fall behind and restart under heavy load when the DFE engine is enabled in lab mode.

  • Fixed a bug that prevented the correct error message from being reported when a bulk load failed because of an out-of-memory condition.

  • Fixed a SPARQL bug where the character encoding was placed in the Content-Encoding header in SPARQL query responses. Now charset is placed in the Content-Type header instead, enabling HTTP clients to recognize the character set being used automatically.

Query-Language Versions Supported in This Release

Before upgrading a DB cluster to version, make sure that your project is compatible with these query-language versions:

  • Gremlin version: 3.4.8

  • SPARQL version: 1.1

Upgrade Paths to Engine Release

You can manually upgrade any previous Neptune engine release to this release.

You will not automatically upgrade to this release.

Upgrading to This Release

Amazon Neptune is now generally available.

If a DB cluster is running an engine version from which there is an upgrade path to this release, it is eligible to be upgraded now. You can upgrade any eligible cluster using the DB cluster operations on the console or by using the SDK. The following CLI command will upgrade an eligible cluster immediately:

For Linux, OS X, or Unix:

aws neptune modify-db-cluster \ --db-cluster-identifier (your-neptune-cluster) \ --engine-version \ --apply-immediately

For Windows:

aws neptune modify-db-cluster ^ --db-cluster-identifier (your-neptune-cluster) ^ --engine-version ^ --apply-immediately

Updates are applied to all instances in a DB cluster simultaneously. An update requires a database restart on those instances, so you will experience downtime ranging from 20–30 seconds to several minutes, after which you can resume using the DB cluster.

Always test before you upgrade

When a new major or minor Neptune engine version is released, always test your Neptune applications on it first before upgrading to it. Even a minor upgrade could introduce new features or behavior that would affect your code.

Start by comparing the release notes pages from your current version to those of the targeted version to see if there will be changes in query language versions or other breaking changes.

The best way to test a new version before upgrading your production DB cluster is to clone your production cluster so that the clone is running the new engine version. You can then run queries on the clone without affecting the production DB cluster.

Always create a manual snapshot before you upgrade

Before performing an upgrade, we strongly recommend that you always create a manual snapshot of your DB cluster. Having an automatic snapshot only offers short-term protection, whereas a manual snapshot remains available until you explicitly delete it.

In certain cases Neptune creates a manual snapshot for you as a part of the upgrade process, but you should not rely on this, and should create your own manual snapshot in any case.

When you are certain that you won't need to revert your DB cluster to its pre-upgrade state, you can explicitly delete the manual snapshot that you created yourself, as well as the manual snapshot that Neptune might have created. If Neptune creates a manual snapshot, it will have a name that begins with preupgrade, followed by the name of your DB cluster, the source engine version, the target engine version, and the date.


If you are trying to upgrade while a pending action is in process, you may encounter an error such as the following:

We're sorry, your request to modify DB cluster (cluster identifier) has failed. Cannot modify engine version because instance (instance identifier) is running on an old configuration. Apply any pending maintenance actions on the instance before proceeding with the upgrade.

If you encounter this error, wait for the pending action to finish, or trigger a maintenance window immediately to let the previous upgrade complete.

For more information about upgrading your engine version, see Maintaining your Amazon Neptune DB Cluster. If you have any questions or concerns, the AWS Support team is available on the community forums and through AWS Premium Support.