[jira] [Closed] (HBASE-8157) Allow better control over lease timeouts on a per-scan basis

["Andrew Kyle Purtell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-8157?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Kyle Purtell closed HBASE-8157.
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> Allow better control over lease timeouts on a per-scan basis
> ------------------------------------------------------------
>
>                 Key: HBASE-8157
>                 URL: https://issues.apache.org/jira/browse/HBASE-8157
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Bryan Beaudreault
>            Priority: Minor
>
> Changing the global scanner lease timeout is a heavy-handed solution for long scans on a cluster that may be used by a variety of applications.  Two additions would make this easier to manage in this circumstance:
> 1) Allow overriding hbase.regionserver.lease.period on a per-scan basis.
> 2) Allow manual reporting of progress, similar to Hadoop's context.progress().  Example usage:
> {noformat}
> Scan scan = new Scan(startRow, endRow);
> scan.setCaching(someVal); // based on what we expect most rows to take for processing time
> ResultScanner scanner = table.getScanner(scan);
> for (Result r : scanner) {
>   //
>   // usual processing, the time for which we accounted for in our caching and global lease timeout settings
>   //
>   if (someCondition) {
>     //
>     // More time-intensive processing necessary on this record, which is hard to account for in the caching
>     //
>     scanner.progress();
>   }
> }
> {noformat}



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