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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11315) Keeping MVCC for configurable longer time
Date Mon, 07 Jul 2014 01:51:33 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jeffrey Zhong updated HBASE-11315:
----------------------------------

      Resolution: Fixed
    Hadoop Flags: Reviewed
          Status: Resolved  (was: Patch Available)

Thanks [~saint.ack@gmail.com] & [~enis] for the reviews. I've incorporated all Stack's
feedbacks on v1 patch and fixed javadoc & findbug warnings as well.

The patch has been integrated into master branch and branch-1. 

> Keeping MVCC for configurable longer time 
> ------------------------------------------
>
>                 Key: HBASE-11315
>                 URL: https://issues.apache.org/jira/browse/HBASE-11315
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.99.0
>            Reporter: Jeffrey Zhong
>            Assignee: Jeffrey Zhong
>         Attachments: hbase-11315-v1.patch, hbase-11315.patch
>
>
> After hbase-8763, we need keep mvcc number longer in hfile so that it can be used to
order changes during writes. For example, the known put,delete,put,... scenario, cross region
server scan, out of order puts(in recovery case).
> Current thinking is that we make the retention period configurable(below we're using
1 day to explain). During major compaction, we check hfile's creation time if a hfile creation
time is older than 1 day then all mvcc of KVs in that hfile will be removed. If a hfile is
created within 1 day, then all mvccs of KVs in that hfile will be kept. 
> In case there are time clock skew, we can firstly sort hfiles based on its seqId in ascending
order and find the first hfile's creation time stamp less than 1 day. Then mvcc of all hfiles
before the found file will be removed during compaction. 



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