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From "Ed Coleman (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-4061) Add way to determine Accumulo version from a running tserver
Date Thu, 19 Nov 2015 12:51:11 GMT
Ed Coleman created ACCUMULO-4061:
------------------------------------

             Summary: Add way to determine Accumulo version from a running tserver
                 Key: ACCUMULO-4061
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4061
             Project: Accumulo
          Issue Type: New Feature
          Components: tserver
            Reporter: Ed Coleman
            Priority: Minor
             Fix For: 1.8.0


When upgrading by performing a rolling restart, realized that there was no way to determine
the version of a running tserver other than using ps to get start time or maybe a versioned
package on the classpath.

A typical deployment structure seems to be lay down the Accumulo directories with a version
and then use a symbolic link to point to the version that is used at run-time. As an example:

/usr/local/accumulo
/usr/local/accumulo/accumulo-1.6.2
/usr/local/accumulo/accumulo-1.6.3
/usr/local/accumulo/accumulo-latest --> /usr/local/accumulo/accumulo-1.6.3

To upgrade without a complete shutdown, we lay down the new version, update the symbolic link
and then perform a rolling restart of the tservers, with scripts, env,... using the symbolic
link to specify which version are used.

Realized that if the rolling shutdown failed for any particular tserver, it would keep running
the previous version.  The only way to determine if we were running the desired version was
to use ps and check the running time of the tserver process.

The could also be a situation were a "dead" server would be offline during the upgrade and
not receive the new version. If the server was resurrected and services started before updated
versions are installed it could be difficult to determine exactly what version of the tserver
was running. 

It would be nice if there was some way to ask a running tserver what version it is. That way,
post-upgrade we could confirm that all running tservers reply with the expected version.





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