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From "John Vines (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4062) Change MutationSet.mutations to use HashSet
Date Thu, 19 Nov 2015 22:12:11 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15014507#comment-15014507
] 

John Vines commented on ACCUMULO-4062:
--------------------------------------

Given the strict tracking we have about order of mutations coming in, it may not be an explicit
contract but it's certainly implied. If I currently add 2 mutations for the same row and column
with different data, the one that comes in last wins. The suggested change would make the
result dependent on the hash function instead.

> 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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