[jira] [Work started] (HBASE-10413) Tablesplit.getLength returns 0

["Lukas Nalezenec (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-10413?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HBASE-10413 started by Lukas Nalezenec.

> Tablesplit.getLength returns 0
> ------------------------------
>
>                 Key: HBASE-10413
>                 URL: https://issues.apache.org/jira/browse/HBASE-10413
>             Project: HBase
>          Issue Type: Bug
>          Components: Client, mapreduce
>    Affects Versions: 0.96.1.1
>            Reporter: Lukas Nalezenec
>            Assignee: Lukas Nalezenec
>
> InputSplits should be sorted by length but TableSplit does not contain real getLength implementation:
>   @Override
>   public long getLength() {
>     // Not clear how to obtain this... seems to be used only for sorting splits
>     return 0;
>   }
> This is causing us problem with scheduling - we have got jobs that are supposed to finish in limited time but they get often stuck in last mapper working on large region.
> Can we implement this method ? 
> What is the best way ?
> We were thinking about estimating size by size of files on HDFS.
> We would like to get Scanner from TableSplit, use startRow, stopRow and column families to get corresponding region than computing size of HDFS for given region and column family. 
> Update:
> This ticket was about production issue - I talked with guy who worked on this and he said our production issue was probably not directly caused by getLength() returning 0. 



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