hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3443) ICV optimization to look in memstore first and then store files (HBASE-3082) does not work when deletes are in the mix
Date Thu, 12 Apr 2012 19:05:19 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252743#comment-13252743
] 

stack commented on HBASE-3443:
------------------------------

What J-D said.
                
> ICV optimization to look in memstore first and then store files (HBASE-3082) does not
work when deletes are in the mix
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-3443
>                 URL: https://issues.apache.org/jira/browse/HBASE-3443
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.90.0, 0.90.1, 0.90.2, 0.90.3, 0.90.4, 0.90.5, 0.90.6, 0.92.0,
0.92.1
>            Reporter: Kannan Muthukkaruppan
>            Assignee: Lars Hofhansl
>            Priority: Critical
>              Labels: corruption
>             Fix For: 0.96.0
>
>         Attachments: 3443.txt
>
>
> For incrementColumnValue() HBASE-3082 adds an optimization to check memstores first,
and only if not present in the memstore then check the store files. In the presence of deletes,
the above optimization is not reliable.
> If the column is marked as deleted in the memstore, one should not look further into
the store files. But currently, the code does so.
> Sample test code outline:
> {code}
> admin.createTable(desc)
> table = HTable.new(conf, tableName)
> table.incrementColumnValue(Bytes.toBytes("row"), cf1name, Bytes.toBytes("column"), 5);
> admin.flush(tableName)
> sleep(2)
> del = Delete.new(Bytes.toBytes("row"))
> table.delete(del)
> table.incrementColumnValue(Bytes.toBytes("row"), cf1name, Bytes.toBytes("column"), 5);
> get = Get.new(Bytes.toBytes("row"))
> keyValues = table.get(get).raw()
> keyValues.each do |keyValue|
>   puts "Expect 5; Got Value=#{Bytes.toLong(keyValue.getValue())}";
> end
> {code}
> The above prints:
> {code}
> Expect 5; Got Value=10
> {code}

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message