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From "Eric Newton (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-3837) "Instance Name: null" appears when Monitor first starts
Date Tue, 26 May 2015 14:48:17 GMT


Eric Newton commented on ACCUMULO-3837:

bq. Why not centralize this in the monitor that we can wait to get the instance name once
before the HTTP server comes up instead of in each servlet?

Well, it is centralized, in that it is done in {{BasicServlet}}, from which all the other
servlets are derived.  But the instance name is not fetched until it is needed. which I think
is more your point.

I'll fix that, too.

> "Instance Name: null" appears when Monitor first starts
> -------------------------------------------------------
>                 Key: ACCUMULO-3837
>                 URL:
>             Project: Accumulo
>          Issue Type: Bug
>          Components: monitor
>            Reporter: Josh Elser
>            Assignee: Eric Newton
>             Fix For: 1.6.3, 1.8.0, 1.7.1
> This is one of those infuriating "it's always been like this" bugs with the monitor.
> The monitor lazily initializes itself with information from the Master. One of these
is the Instance Name for the cluster. So, when you first visit the monitor, you'll notice
that you get "Instance Name: null" in the header.
> Eventually the actual instance name will get filled in. We can do better than propagate
"null" to our users. The monitor knows the directory in HDFS and thus the instance ID. It
can also get the instance name from the mapping in HDFS. Best as I understand, it's just lazy
that we don't do this.

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