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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-724) Deleted rows reappear after a HStore.flushCache() and/or HStore.compactStores()
Date Mon, 07 Jul 2008 13:05:31 GMT

    [ https://issues.apache.org/jira/browse/HBASE-724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12611147#action_12611147
] 

Jean-Daniel Cryans commented on HBASE-724:
------------------------------------------

This seems related to HBASE-702.

{quote}
get() returns the cells in the order that it finds it... how can it be working? i.e. how does
the cells are returned in chronological order? I must just not understand the algorithm but
let's say there are multiple versions of the same cell spanned in several mapfiles... all
the mapfiles are read sequentially so what garanties that the versions will be found in chronological
order? are the mapfiles somehow read in chronological order? and within a mapfile, are the
versions of a cell in chronological order as well?
{quote}

The rows are stored and sorted by their HStoreKey which is row+timestamp,

FYI. this kind of question belongs to the mailing list or you can also drop by on IRC, it
wil be nice to chat with someone else from Montreal ;) 

> Deleted rows reappear after a HStore.flushCache() and/or HStore.compactStores()
> -------------------------------------------------------------------------------
>
>                 Key: HBASE-724
>                 URL: https://issues.apache.org/jira/browse/HBASE-724
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.1.3
>            Reporter: Sebastien Rainville
>         Attachments: testdeleteall.patch
>
>
> When deleting a row, that row seems to be deleted and everything to be normal but some
time afterwards that row somehow reappears (HTable.get() and scanners find it again). Looking
at the log files it seems like deleted rows reappear after a flush of the memcache or after
the compaction...

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