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https://issues.apache.org/jira/browse/HBASE-1759?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Gray updated HBASE-1759:
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Commited to 0.21 trunk and 0.20 branch
> Ability to specify scanner caching on a per-scan basis
> ------------------------------------------------------
>
> Key: HBASE-1759
> URL: https://issues.apache.org/jira/browse/HBASE-1759
> Project: Hadoop HBase
> Issue Type: Improvement
> Components: client
> Affects Versions: 0.20.0
> Reporter: Ken Weiner
> Assignee: Ken Weiner
> Fix For: 0.20.0, 0.21.0
>
> Attachments: HBASE-1759-v2.patch, HBASE-1759.patch
>
>
> I think that clients should have the ability to configure the scanner caching
> setting on a per-scan basis via the org.apache.hadoop.hbase.client.Scan
> object. I propose adding a new caching property to the Scan class which
> would override the HTable.scannerCaching property if set. This would turn
> the HTable.scannerCaching property into more of a default setting.
> The code inside ClientScanner (an inner-class implementation of
> ResultScanner) would look like this:
> {code}
> // Use the caching from the Scan. If not set, use the default cache
> setting for this table.
> if (this.scan.getCaching() > 0) {
> this.caching = this.scan.getCaching();
> } else {
> this.caching = HTable.this.scannerCaching;
> }
> {code}
> Note that currently the only option for per-scan scanner caching
> configuration is to modify the state of HTable for each Scan. This could
> lead to confusion when HTables are pooled since the pool would potentially
> end up with many HTables all configured differently.
> I will attach a patch. I'm looking forward to hearing your comments.
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