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If a node falled behind, when catching up with the rest of the cluster, it is possible that a lot of append entries accumulate and the server would print warnings such as: ``` [WRN] RAFT [jZ6RvVRH - S-R3F-CQw2ImK6] <some number> append entries pending ``` It would then continously print the following warning: ``` AppendEntry failed to be placed on internal channel ``` When that happens, this node would always be shown with be running the same number of operations behind (using `nats s info`) if there are no new messages added to the stream, or an increasing number of operations if there is still activity. Signed-off-by: Ivan Kozlovic <ivan@synadia.com>
NATS is a simple, secure and performant communications system for digital systems, services and devices. NATS is part of the Cloud Native Computing Foundation (CNCF). NATS has over 40 client language implementations, and its server can run on-premise, in the cloud, at the edge, and even on a Raspberry Pi. NATS can secure and simplify design and operation of modern distributed systems.
Documentation
- Official documentation
- FAQ
- Watch a video overview of NATS to learn more about its origin story and design philosophy.
Contact
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Contributing
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Security
Security Audit
A third party security audit was performed by Cure53, you can see the full report here.
Reporting Security Vulnerabilities
If you've found a vulnerability or a potential vulnerability in the NATS server, please let us know at nats-security.
License
Unless otherwise noted, the NATS source files are distributed under the Apache Version 2.0 license found in the LICENSE file.