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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (ACCUMULO-96) Need to handle case where tablet has lots of delete entries
Date Mon, 20 Mar 2017 15:07:42 GMT

     [ https://issues.apache.org/jira/browse/ACCUMULO-96?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Keith Turner reassigned ACCUMULO-96:
------------------------------------

    Assignee: Keith Turner

> Need to handle case where tablet has lots of delete entries
> -----------------------------------------------------------
>
>                 Key: ACCUMULO-96
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-96
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>            Reporter: Keith Turner
>            Assignee: Keith Turner
>             Fix For: 2.0.0
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Currently Accumulo only drops delete entries when its major compacting all files.  All
files may never be compacted.  Lots of delete entries building up can be problematic for scan
performance.
> Possible solutions :
>  * Keep a count of the # of delete entries per file.  Compact all when the ratio of delete
entries to entries crosses a threshold.
>  * When a scan encounters a tablet w/ a lot of delete entries, schedule a majc.  This
is reactive, but removes the need for bookkeeping in the previous solution. 



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