[
https://issues.apache.org/jira/browse/HBASE-13984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14902488#comment-14902488
]
He Liangliang commented on HBASE-13984:
---------------------------------------
"not in sort order" means for each row the scanner first fetch from storeHeap,
then from joinedHeap, but the kvs in joinedHeap may less than kvs from
storeHeap so there is a final sort before returning to client. This feature
require break between rows just because the current implementation does not
support seek in the middle of a row for a new scanner.
Renamed nextCell.
Added a flag which controls the peek call.
> 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-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
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
