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From "sinfox (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-12952) Seek with prefixtree many hang
Date Mon, 02 Feb 2015 04:51:34 GMT

     [ https://issues.apache.org/jira/browse/HBASE-12952?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

sinfox updated HBASE-12952:
---------------------------
    Attachment: hbase_0.98.6.1.patch

> Seek with prefixtree many hang
> ------------------------------
>
>                 Key: HBASE-12952
>                 URL: https://issues.apache.org/jira/browse/HBASE-12952
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.0.0, 0.98.7, 0.98.8, 0.98.6.1, 0.98.9, 0.98.10
>            Reporter: sinfox
>             Fix For: 0.98.6.1
>
>         Attachments: hbase_0.98.6.1.patch
>
>
> I have upgraded my hbase cluster from hbase-0.96 to hbase-0.98.6.1,then i found some
compation hang on many regionserver, and the cpu costed100%.
> It looks like there is an infinite loop somewhere. 
> From the log, i found StoreFileScanner.java : reseekAtOrAfter(HFileScanner s, KeyValue
k) enterd an infinite loop.
> Read source code, I found en error on PrefixTreeArrayReversibleScanner.java : previousRowInternal()
> eg:  
>   A, fan:12, numCell:1
>   A : 1  -> B
>   A : 2  -> C
>   
>   C: 3  -> D
>   C: 4  -> E
>                   
> A, fan:12, numCell:1
> B: fan,numCell:1
> C: fan:34,numCell: 0
> D: fan,numCell:1
> E: fan,numCell:1
> when currentNode is D, its previous node is B , but this function will return A.



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