Backport(v1.16): Fix #4396: Add timeout to establish_connection to prevent infinite loop (#5104) #5137
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…op (#5104) **Which issue(s) this PR fixes**: Fixes #4396 **What this PR does / why we need it**: Adds timeout mechanism to `establish_connection` method to prevent infinite loop when handshake protocol gets stuck. In unstable network environments with proxy components, if connection drops during handshake after TLS establishment, Fluentd gets stuck in infinite loop causing logs to stop being flushed. This fix uses existing `hard_timeout` configuration to break the loop, disable problematic nodes, and maintain log flow through healthy nodes. **Docs Changes**: None required - uses existing `hard_timeout` configuration parameter. **Release Note**: Fix infinite loop in out_forward handshake protocol that could cause logs to stop being flushed in unstable network environments. Signed-off-by: Ian Driver <[email protected]> Co-authored-by: Ian Driver <[email protected]> Signed-off-by: Shizuo Fujita <[email protected]>
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Backport #5104
Which issue(s) this PR fixes:
Fixes #4396
What this PR does / why we need it:
Adds timeout mechanism to
establish_connectionmethod to prevent infinite loop when handshake protocol gets stuck. In unstable network environments with proxy components, if connection drops during handshake after TLS establishment, Fluentd gets stuck in infinite loop causing logs to stop being flushed. This fix uses existinghard_timeoutconfiguration to break the loop, disable problematic nodes, and maintain log flow through healthy nodes.Docs Changes:
None required - uses existing
hard_timeoutconfiguration parameter.Release Note:
Fix infinite loop in out_forward handshake protocol that could cause logs to stop being flushed in unstable network environments.