[jira] [Created] (CELIX-361) etcd_watcher notifications loss when ETCD transaction rate is high

["Gabriele Ricciardi (JIRA)" <ji...@apache.org>]

Gabriele Ricciardi created CELIX-361:
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             Summary: 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


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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