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https://issues.apache.org/jira/browse/HBASE-3443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13250447#comment-13250447
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Benoit Sigoure commented on HBASE-3443:
---------------------------------------
This seems like a pretty bad bug that causes data corruption. I ran into it
this weekend. Which release do you guys think will have a fix for this issue?
> 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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