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https://issues.apache.org/jira/browse/HBASE-15325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15166847#comment-15166847
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Jianwei Cui commented on HBASE-15325:
-------------------------------------
In ScannerCallable#call(), the NotServingRegionException will be wrapped as
DoNotRetryIOException:
{code}
if (ioe instanceof NotServingRegionException) {
// Throw a DNRE so that we break out of cycle of calling NSRE
// when what we need is to open scanner against new location.
// Attach NSRE to signal client that it needs to re-setup scanner.
if (this.scanMetrics != null) {
this.scanMetrics.countOfNSRE.incrementAndGet();
}
throw new DoNotRetryIOException("Resetting the scanner -- see
exception cause", ioe);
{code}
> ResultScanner allowing partial result will reset to the start of the row if
> the region is moved between two rpc requests
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-15325
> URL: https://issues.apache.org/jira/browse/HBASE-15325
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.1.3
> Reporter: Phil Yang
> Assignee: Phil Yang
> Priority: Critical
> Attachments: 15325-test.txt
>
>
> HBASE-11544 allow scan rpc return partial of a row to reduce memory usage for
> one rpc request. And client can setAllowPartial or setBatch to get several
> cells in a row instead of the whole row.
> However, the status of the scanner is saved on server and we need this to get
> the next part if there is a partial result before. If we move the region to
> another RS, client will get a NotServingRegionException and open a new
> scanner to the new RS which will be regarded as a new scan from the start of
> this row. So we will see the cells which have been seen before.
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