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https://issues.apache.org/jira/browse/HBASE-1935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783985#action_12783985
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Dan Washusen commented on HBASE-1935:
-------------------------------------
There is a minor bug in v2 of the patch. The logic in the
ParallelScannerManager to determine if a scan is interested in a region doesn't
handle the case when there is only one region.
The following fixes it:
{code}
Set<HRegionInfo> regions = table.getRegionsInfo().keySet();
for (HRegionInfo region : regions) {
...
boolean isScanInterestedInRegion = (scan.getStartRow().length == 0 &&
scan.getStopRow().length == 0) || regions.size() == 1;
{code}
> Scan in parallel
> ----------------
>
> Key: HBASE-1935
> URL: https://issues.apache.org/jira/browse/HBASE-1935
> Project: Hadoop HBase
> Issue Type: New Feature
> Reporter: stack
> Attachments: pscanner-v2.patch, pscanner.patch
>
>
> A scanner that rather than scan in series, instead scanned multiple regions
> in parallell would be more involved but could complete much faster
> partiularly if results are sparse.
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