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From "Lars Hofhansl (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 Mon, 17 Oct 2011 01:42:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13128564#comment-13128564

Lars Hofhansl commented on HBASE-3443:

I agree. I think delete handling is generally a bit "funky" in HBase (see also HBASE-4536).
> 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
>            Reporter: Kannan Muthukkaruppan
> 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}

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