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From "Denis Petrov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3471) Adding a new tserver puts some tables offline for few minutes
Date Wed, 14 Jan 2015 01:11:34 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14276317#comment-14276317
] 

Denis Petrov commented on ACCUMULO-3471:
----------------------------------------

As I mentioned, the rebalancing on adding a new server takes approximately the same amount
of time as cluster cold startup (~10 minutes).
I would like to ask, is 10 minutes too much to start serve 6000 tables (10 tablets per second)
?

If yes - the problem is with slow load.

But if it is ok, then my problem is why master reassings tablets to the new tserver too fast.
The tables are well served by working tservers and what I want is just to limit speed of migration
tables to the new tserver.

> Adding a new tserver puts some tables offline for few minutes
> -------------------------------------------------------------
>
>                 Key: ACCUMULO-3471
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3471
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 1.6.1
>         Environment: Ubuntu 12.04
>            Reporter: Denis Petrov
>             Fix For: 1.6.2, 1.7.0
>
>         Attachments: ACCUMULO-3471-balance-test.patch
>
>
> I run an Accumulo cluster with 15 tservers with about 6000 tablets on each (disks are
quite slow - each node has 2*4Tb SATA)
> When a new tserver added to the cluster, the rebalancing procedure starts.
> During this procedure some tablets are offline and unreachable during 5-10 minutes.
> It is visible in http://monitor:50095/tables and by timeouts on client side.
> The rebalancing caused by killing a tserver converges much faster then rebalancing caused
by adding a tserver.



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