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From "Chang chen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-17375) PrefixTreeArrayReversibleScanner#previousRowInternal doesn't work correctly
Date Mon, 26 Dec 2016 10:16:58 GMT

     [ https://issues.apache.org/jira/browse/HBASE-17375?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chang chen updated HBASE-17375:
-------------------------------
    Attachment: row trie example.PNG

> PrefixTreeArrayReversibleScanner#previousRowInternal doesn't work correctly
> ---------------------------------------------------------------------------
>
>                 Key: HBASE-17375
>                 URL: https://issues.apache.org/jira/browse/HBASE-17375
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.1.7, 0.98.23, 0.98.24
>            Reporter: Chang chen
>         Attachments: row trie example.PNG
>
>
> Recently, we find our hbase compaction thread never end. After investigation, I believe
it's the bug of PrefixTreeArrayReversibleScanner#previousRowInternal.
> {code}
>   private boolean previousRowInternal() {
>     //...
>     while (!beforeFirst) {
>       //....
>       // what if currentRowNode is nub?
>       if (currentRowNode.hasOccurrences()) {// escape clause
>         currentRowNode.resetFanIndex();
>         return true;// found some values
>       }
>     }
> {code}
> Assume we have following cells:
> {quote}
> <A,a> 1
> <A,v> 1
> <Aaeeee,a> 1
> <Aaeeee,v> 1
> <Abc,a> 1
> <Abc,v> 1
> <Abde,a> 1
> <Abde,v> 1
> {quote}
> If the current row is {color:red}Abc{color}, then the preivous row should be *Aaeeee*,.
However previousRowInternal return {color:red}A{color}



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