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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-17599) Use mayHaveMoreCellsInRow instead of isPartial
Date Thu, 09 Feb 2017 06:25:41 GMT

     [ https://issues.apache.org/jira/browse/HBASE-17599?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Duo Zhang updated HBASE-17599:
    Release Note: The word 'isPartial' is ambiguous so we introduce a new method 'mayHaveMoreCellsInRow'
to replace it. And the old meaning of 'isPartial' is not the same with 'mayHaveMoreCellsInRow'
as for batched scan, if the number of returned cells equals to the batch, isPartial will be
false. After this change the meaning of 'isPartial' will be same with 'mayHaveMoreCellsInRow'.
This is an incompatible change but it is not likely to break a lot of things as for batched
scan the old 'isPartial' is just a redundant information, i.e, if the number of returned cells
reaches the batch limit. You have already know the number of returned cells and the value
of batch.

> Use mayHaveMoreCellsInRow instead of isPartial
> ----------------------------------------------
>                 Key: HBASE-17599
>                 URL: https://issues.apache.org/jira/browse/HBASE-17599
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Client, scan
>    Affects Versions: 2.0.0, 1.4.0
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>             Fix For: 2.0.0, 1.4.0
>         Attachments: HBASE-17599-branch-1.patch, HBASE-17599.patch, HBASE-17599-v1.patch,
HBASE-17599-v2.patch, HBASE-17599-v3.patch
> For now if we set scan.allowPartial(true), the partial result returned will have the
partial flag set to true. But for scan.setBatch(xx), the partial result returned may not be
marked as partial.
> This is an Incompatible change, indeed. But I do not think it will introduce any issues
as we just provide more informations to client. The old partial flag for batched scan is always
false so I do not think anyone can make use of it.
> This is very important for the limited scan to support partial results from server. If
we get a Result which partial flag is false then we know we get the whole row. Otherwise we
need to fetch one more row to see if the row key is changed which causes the logic to be more

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