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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3268) HoldTimeoutException is poorly propagated to clients
Date Mon, 27 Oct 2014 21:50:33 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14185882#comment-14185882
] 

Josh Elser commented on ACCUMULO-3268:
--------------------------------------

Not sure if there is something easy that we can do in the interim before the new client API
is released. 

> HoldTimeoutException is poorly propagated to clients
> ----------------------------------------------------
>
>                 Key: ACCUMULO-3268
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3268
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: client
>    Affects Versions: 1.6.1
>            Reporter: Josh Elser
>            Priority: Critical
>             Fix For: 1.6.2, 1.7.0
>
>
> 6 node cluster was running randomwalk when the MultiTable module failed. A BatchWriter
was trying to add a new Mutation to a table in {{o.a.a.test.randomwalk.multitable.Write}}.
The call to {{addMutations}} failed with a MutationsRejectedException with the information
that there was an exception on the server.
> In actuality, the addition of this mutation triggered a flush and tried to ship it over
to a tabletserver. The tabletserver hosting the tablet for that mutation was under load but
still responsive. The hold time was exceeded for this tserver, but all the client sees is
that there was *some* exception on this server.
> If the client actually *knew* that commits were being held, it could correctly back off
(sleep) and retry the mutations since the last flush. Right now, they can't really do anything.
Additionally, being unable to get the mutations that were buffered since the last flush is
sub-par, but that can be worked around.



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