Mantis - Resin
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ID: Category: Severity: Reproducibility: Date Submitted: Last Update:
6291 minor always 10-21-19 05:07 03-21-24 07:10
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Priority: high OS Version:  
Status: new Product Version: 4.0.62  
Product Build: Resolution: open  
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Summary: 0006291: mod_caucho does not see new elastic servers
Description: (rep by J. Meyer)

mod_caucho does not automatically pick up new elastic servers. The elastic servers should show up under the virtual host section. The issue appears to Resin's failure to update the in-memory host etag cache after a cluster change. The workarounds are either:

1. restarting the triad servers, thereby clearing the cache on the backend, or
2. restarting apache/mod_caucho, thereby clearing the cache on the frontend

If only a triad server is restarted, then mod_caucho would eventually see the elastic server when it queries the restarted triad server through round-robin.


code trail:
1. HmuxDispatchRequest.handleRequest()
2. HmuxDispatchRequest.queryAll()
3. Host.setConfigETag()

An alternative workaround is to prevent mod_caucho from sending the etag to Resin. In modules/c/src/common/config.c->cse_update_host_from_resin(), delete the following lines:

    if (host->etag[0])
        hmux_write_string(&s, HMUX_DISPATCH_ETAG, host->etag);
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Attached Files:  among-us-shooting-boxes.jpg [^] (4,633 bytes) 03-21-24 07:10

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