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Posted to commits@celix.apache.org by "Gabriele Ricciardi (JIRA)" <ji...@apache.org> on 2016/05/09 12:51:12 UTC
[jira] [Updated] (CELIX-361) etcd_watcher notifications loss when
ETCD transaction rate is high
[ https://issues.apache.org/jira/browse/CELIX-361?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gabriele Ricciardi updated CELIX-361:
-------------------------------------
Attachment: etcd_lost_transactions.patch
> etcd_watcher notifications loss when ETCD transaction rate is high
> ------------------------------------------------------------------
>
> Key: CELIX-361
> URL: https://issues.apache.org/jira/browse/CELIX-361
> Project: Celix
> Issue Type: Bug
> Components: Remote Service Admin
> Reporter: Gabriele Ricciardi
> Attachments: etcd_lost_transactions.patch
>
>
> ETCD, by design, keeps track only of the last 1000 transactions. The transactions counter is globally used. In certain occasions (e.g. during the startup of a wide system using ETCD as information exchange database) the transactions counter increases very fast.
> When the etcd_watcher listening for changes on a certain folder is notified, it gets back the next valid transaction id to use for watching, or an error in case the transaction id increased more than 1000 (such a mechanism is used to notify the watcher of possible history loss).
> The error handling is not implemented in the discovery_etcd.
> Attached a patch that (should) fix the issue by implementing this error handling mechanism.
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