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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ACCUMULO-3235) No-chop merges
Date Thu, 22 Oct 2015 18:30:27 GMT

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

Christopher Tubbs updated ACCUMULO-3235:
----------------------------------------
    Fix Version/s: 1.8.0

> 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
>             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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