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https://issues.apache.org/jira/browse/HBASE-15325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15177523#comment-15177523
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Phil Yang commented on HBASE-15325:
-----------------------------------
And just like I mentioned before(both in JIRA and rb), the definition of
Result.isPartial is not clear. In javadoc comments:
{code}
/**
* Whether or not the result is a partial result. Partial results contain a
subset of the cells
* for a row and should be combined with a result representing the remaining
cells in that row to
* form a complete (non-partial) result.
* @return Whether or not the result is a partial result
*/
public boolean isPartial() {
return partial;
}
{code}
This definition is helpful for user I think because true means it is not a
complete row and false means it is absolutely complete. However, now(even
without this patch) we doesn't follow this definition. I think we should fix
it, may be by add a user-invisible flag which has the same meaning for
isPartial and make isPartial right.
> ResultScanner allowing partial result will miss the rest 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: 1.2.0, 1.1.3
> Reporter: Phil Yang
> Assignee: Phil Yang
> Priority: Critical
> Attachments: 15325-test.txt, HBASE-15325-v1.txt, HBASE-15325-v2.txt,
> HBASE-15325-v3.txt, HBASE-15325-v5.txt, HBASE-15325-v6.1.txt,
> HBASE-15325-v6.2.txt, HBASE-15325-v6.3.txt, HBASE-15325-v6.4.txt,
> HBASE-15325-v6.5.txt, HBASE-15325-v6.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 end of
> this row. So the rest cells of the row of last result will be missing.
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