You are viewing a plain text version of this content. The canonical link for it is here.
Posted to notifications@accumulo.apache.org by "Keith Turner (JIRA)" <ji...@apache.org> on 2017/03/20 15:07:42 UTC
[jira] [Assigned] (ACCUMULO-96) Need to handle case where tablet
has lots of delete entries
[ 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.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)