[jira] [Assigned] (ACCUMULO-3235) No-chop merges

["Christopher Tubbs (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ACCUMULO-3235?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Christopher Tubbs reassigned ACCUMULO-3235:
-------------------------------------------

    Assignee: Christopher Tubbs

> No-chop merges
> --------------
>
>                 Key: ACCUMULO-3235
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3235
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: tserver
>            Reporter: Christopher Tubbs
>            Assignee: Christopher Tubbs
>             Fix For: 1.8.0
>
>
> Merges currently require a special "chop" major compaction, which can be slow. The idea is simple: in the metadata entries for files, we track the range in use for that file with a notation.
> This additional metadata would be used to merge tablets without re-writing data. Only this extra metadata would be updated (to a narrower range when split, and possibly collapsed if merging adjacent ranges). If a range is missing for a file, the tablet's range will be used instead. This simplifies things for backwards compatibility, and means we don't need to include a redundant range if the tablet isn't splitting/merging.



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