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https://issues.apache.org/jira/browse/ACCUMULO-4328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15315228#comment-15315228
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Ed Coleman commented on ACCUMULO-4328:
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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: https://issues.apache.org/jira/browse/ACCUMULO-4328
> 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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