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https://issues.apache.org/jira/browse/HBASE-17931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15972073#comment-15972073
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Phil Yang commented on HBASE-17931:
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Another option is keep compatibility between client 1.4 and server 1.3, and
compatibility between client 2.0 and server 1.4. Then we can rolling upgrade
from 1.3 to 1.4 and from 1.4 to 2.0. But we have to release 1.4.0 before 2.0.0.
Which means we should return more results in 1.4 server and don't have to do
this in 2.0
> Rolling upgrade on branch-1 and master
> --------------------------------------
>
> Key: HBASE-17931
> URL: https://issues.apache.org/jira/browse/HBASE-17931
> Project: HBase
> Issue Type: Bug
> Components: scan
> Affects Versions: 1.4.0
> Reporter: Phil Yang
> Priority: Blocker
> Fix For: 2.0.0
>
>
> In branch-1 and master we have some improvement and new features on scanning
> which is not compatible.
> A client of old version to a server of new version is compatible (must be a
> bug if not, maybe need some test?).
> A client of new version may not be able to read from a server of old version
> correctly (because of scan limit, moreResults flag, etc), which is ok for
> major/minor upgrade and we can tell users to upgrade server before upgrading
> client. But RS also use scan to read meta. If meta table is in RS of old
> version, all RSs of new version may have trouble while scanning meta table.
> So we should make sure meta table always in servers of new version. Force
> meta table in Master and upgrade Master first, or assign meta table in region
> servers with latest version?
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