[jboss-jira] [JBoss JIRA] (JGRP-1826) Discovery: file-based discovery protocols should not send discovery requests

[Bela Ban (JIRA)]

Bela Ban created JGRP-1826:
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             Summary: Discovery: file-based discovery protocols should not send discovery requests
                 Key: JGRP-1826
                 URL: https://issues.jboss.org/browse/JGRP-1826
             Project: JGroups
          Issue Type: Enhancement
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 3.5


When a node stores its information in a directory ({{FILE_PING}}, {{S3_PING}} or {{GOOGLE_PING}}), then we can optimize discovery by implementing a few things:
* After reading all files, we send each node (represented by a file) a discovery request. That node processes the request and sends back a discovery response. This is unneeded traffic, especially with large clusters. Instead
** Read all files and add the information read from the files into the local caches (logical_addr_cache, UUID cache etc). This is the same as processing discovery responses from all members
** Determine the coordinators directly from the file information. Perhaps we could even create a special file which contains information about the coordinator.
*** This would prevent partitions from happening when starting up a large number of nodes: as long as that special file exists, nobody else will take ownership of it. When the coord leaves or crashes, we atomically replace the special file

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