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From "Shengsheng Huang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6372) Add scanner batching to Export job
Date Mon, 06 Aug 2012 08:16:03 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13429020#comment-13429020
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Shengsheng Huang commented on HBASE-6372:
-----------------------------------------

It seems the current Scan#setBatch function may throw exception. Details as below:
{quote}
public void setBatch(int batch) {
    if (this.hasFilter() && this.filter.hasFilterRow()) {
      throw new IncompatibleFilterException(
        "Cannot set batch on a scan using a filter" +
        " that returns true for filter.hasFilterRow");
    }
    this.batch = batch;
  }
{quote}
Don't we need to catch that exception in this patch? 

                
> Add scanner batching to Export job
> ----------------------------------
>
>                 Key: HBASE-6372
>                 URL: https://issues.apache.org/jira/browse/HBASE-6372
>             Project: HBase
>          Issue Type: Improvement
>          Components: mapreduce
>    Affects Versions: 0.96.0, 0.94.2
>            Reporter: Lars George
>            Assignee: Shengsheng Huang
>            Priority: Minor
>              Labels: newbie
>         Attachments: HBASE-6372.2.patch, HBASE-6372.3.patch, HBASE-6372.4.patch, HBASE-6372.patch
>
>
> When a single row is too large for the RS heap then an OOME can take out the entire RS.
Setting scanner batching in custom scans helps avoiding this scenario, but for the supplied
Export job this is not set.
> Similar to HBASE-3421 we can set the batching to a low number - or if needed make it
a command line option.

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