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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6059) Replaying recovered edits would make deleted data exist again
Date Tue, 22 May 2012 04:47:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13280718#comment-13280718
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ramkrishna.s.vasudevan commented on HBASE-6059:
-----------------------------------------------

I think only major compaction could lead us to this problem which probabaly deletes it.  
Incase of TTL expiry of all the entries in a store file, can we have this scenario of empty
StoreFile getting created on minor or major compaction? I think creating empty store file
should be fine.  Lets take others input also on this?
                
> Replaying recovered edits would make deleted data exist again
> -------------------------------------------------------------
>
>                 Key: HBASE-6059
>                 URL: https://issues.apache.org/jira/browse/HBASE-6059
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>         Attachments: HBASE-6059-testcase.patch, HBASE-6059.patch
>
>
> When we replay recovered edits, we used the minSeqId of Store, It may cause deleted data
appeared again.
> Let's see how it happens. Suppose the region with two families(cf1,cf2)
> 1.put one data to the region (put r1,cf1:q1,v1)
> 2.move the region from server A to server B.
> 3.delete the data put by step 1(delete r1)
> 4.flush this region.
> 5.make major compaction for this region
> 6.move the region from server B to server A.
> 7.Abort server A
> 8.After the region is online, we could get the deleted data(r1,cf1:q1,v1)
> (When we replay recovered edits, we used the minSeqId of Store, because cf2 has no store
files, so its seqId is 0, so the edit log of put data will be replayed to the region)

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