[jira] [Updated] (HBASE-13984) Add option to allow caller to know the heartbeat and scanner position when scanner timeout

["He Liangliang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-13984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

He Liangliang updated HBASE-13984:
----------------------------------
    Attachment: HBASE-13984-V5.diff

Add tests for all cases in TestFromClientSide

> Add option to allow caller to know the heartbeat and scanner position when scanner timeout
> ------------------------------------------------------------------------------------------
>
>                 Key: HBASE-13984
>                 URL: https://issues.apache.org/jira/browse/HBASE-13984
>             Project: HBase
>          Issue Type: Improvement
>          Components: Scanners
>            Reporter: He Liangliang
>            Assignee: He Liangliang
>         Attachments: HBASE-13984-V1.diff, HBASE-13984-V2.diff, HBASE-13984-V3.diff, HBASE-13984-V3.patch, HBASE-13984-V4.diff, HBASE-13984-V5.diff
>
>
> HBASE-13090 introduced scanner heartbeat. However, there are still some limitations (see HBASE-13215). In some application, for example, an operation access hbase to scan table data, and there is strict limit that this call must return in a fixed interval. At the same time, this call is stateless, so the call must return the next position to continue the scan. This is typical use case for online applications.
> Based on this requirement, some improvements are proposed:
> 1. Allow client set a flag whether pass the heartbeat (a result contains the scanner position) to the caller (via ResultScanner next)
> 2. Allow the client pass a timeout to the server, which can override the server side default value
> 3. When requested by the client, the server peek the next cell and return to the client in the heartbeat message



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