[jira] [Commented] (HBASE-21032) ScanResponses contain only one cell each

["Reid Chan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-21032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16575727#comment-16575727 ] 

Reid Chan commented on HBASE-21032:
-----------------------------------

Thanks for this report Andrey [~timoha], so, do you expect the partial results could be more?

> ScanResponses contain only one cell each
> ----------------------------------------
>
>                 Key: HBASE-21032
>                 URL: https://issues.apache.org/jira/browse/HBASE-21032
>             Project: HBase
>          Issue Type: Bug
>          Components: Scanners
>    Affects Versions: 2.1.0
>         Environment: HBase 2.1.0
> Hadoop 2.8.4
> Java 8
>            Reporter: Andrey Elenskiy
>            Priority: Major
>         Attachments: App.java
>
>
> I have a long row with a bunch of columns that I'm scanning with setAllowPartialResults(true). In the response I'm getting the first partial ScanResponse being around 2MB with multiple cells while all of the consequent ones being 1 cell per ScanResponse. After digging more, I found that each of those single cell ScanResponse partials are preceded by a heartbeat (zero cells). This results in two requests per cell to a regionserver.
> I've attached code to reproduce it on hbase version 2.1.0 (it works as expected on 2.0.0 and 2.0.1).
> [^App.java]
> I'm fairly certain it's a serverside issue as [gohbase|https://github.com/tsuna/gohbase] client is having the same issue. I have not tried to reproduce this with multi-row scan.



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