0006291: mod_caucho does not see new elastic servers - Mantis

Mantis Bugtracker

Viewing Issue Simple Details [ Jump to Notes ]

[ View Advanced ] [ Issue History ] [ Print ]

ID

Category

Severity

Reproducibility

Date Submitted

Last Update

0006291

[Resin]

minor

always

10-21-19 05:07

03-21-24 07:10

Reporter

nam

View Status

public

Assigned To

Priority

high

Resolution

open

Status

new

Product Version

4.0.62

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);

Additional Information

among-us-shooting-boxes.jpg [^] (4,633 bytes) 03-21-24 07:10

Relationships

There are no notes attached to this issue.

Issue History
Date Modified	Username	Field	Change
10-21-19 05:07	nam	New Issue
10-21-19 05:12	nam	Description Updated
10-21-19 05:12	nam	Description Updated
10-21-19 05:14	nam	Summary	hmux mod_caucho etag cache is not updated when an elastic server joins the cluster => hmux mod_caucho etag host cache is not updated when an elastic server joins the cluster
10-21-19 05:14	nam	Summary	hmux mod_caucho etag host cache is not updated when an elastic server joins the cluster => mod_caucho does not see new elastic servers
10-22-19 03:52	padmavathi	Note Added: 0006918
10-23-19 09:07	ferg	Note Deleted: 0006918
10-30-22 19:55	anotherthis	Note Added: 0007114
12-21-22 00:04	lorde	Note Added: 0007132
02-01-23 14:41	ferg	Note Deleted: 0007114
02-01-23 14:41	ferg	Note Deleted: 0007132
09-27-23 21:10	Nanasi1	Note Added: 0007266
11-08-23 03:33	juliasmith	Note Added: 0007329
11-14-23 17:17	ferg	Note Deleted: 0007266
11-14-23 17:17	ferg	Note Deleted: 0007329
03-21-24 07:10	eggarsoviet	File Added: among-us-shooting-boxes.jpg

Mantis 1.0.0rc3[^]

Copyright © 2000 - 2005 Mantis Group

46 total queries executed.
31 unique queries executed.