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From "Ed Coleman (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-4328) Run multiple tablet servers on a single host
Date Sat, 04 Jun 2016 01:32:59 GMT


Ed Coleman commented on ACCUMULO-4328:

Upfront, I'm neutral on this and could go either way - with the caveat that going from 1.6.x
to 1.6.6 with this capability does not change any behavior if the feature is not enabled.
And that would include needing to modify a current user script in any way. If I can use a
1.6.x config and run it with 1.6.6 without needing to change anything, well, maybe. I'm less
worried about going backward, but we would want it documented clearly so that people know
what to expect if the needed to roll back and were counting on this.

Random ports bother me. If there is an option to assign a port, or default to a random one
if you don't care, okay - if I can only use a random port, that seems to be a problem if we
try to be more container friendly as well as port blocking considerations.

The big question that I have is, even if you could do this, would you want to? Are there any
performance improvements running multiple tservers vs increasing thread counts and memory
on a single tserver? I don't think we are normally CPU bound, and multiple tservers are going
to be contending for the same IO bandwidth. If we had a benchmark where this did show substantial
improvement, then maybe its okay for the 1.6 line. If we don't have that or the time to evaluate
it, then 1.7+ may be a better option so that we don't get into a case where - sure its possible
- but don't ever do that because A, B ... Z in 1.6.6, use 1.7.x where we fixed that...

> Run multiple tablet servers on a single host
> --------------------------------------------
>                 Key: ACCUMULO-4328
>                 URL:
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: scripts, tserver
>            Reporter: Dave Marion
>            Assignee: Dave Marion
>          Time Spent: 10m
>  Remaining Estimate: 0h
> Modify scripts and necessary code to run multiple tablet servers on a single host.

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