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https://issues.apache.org/jira/browse/ACCUMULO-4062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15018322#comment-15018322
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Keith Turner commented on ACCUMULO-4062:
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I think the expense should be quantified through a series of experiments.
Some users will not want/need this deduping behavior and should not have to pay
an extra cost IF its significant.
> Change MutationSet.mutations to use HashSet
> -------------------------------------------
>
> Key: ACCUMULO-4062
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4062
> Project: Accumulo
> Issue Type: Improvement
> Components: client
> Reporter: Dave Marion
>
> Change TabletServerBatchWriter.MutationSet.mutations from a
> {code}
> HashMap<String,List<Mutation>>
> {code}
> to
> {code}
> HashMap<String,HashSet<Mutation>>
> {code}
> so that duplicate mutations added by a client are not sent to the server.
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