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https://issues.apache.org/jira/browse/HBASE-19997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16522303#comment-16522303
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Duo Zhang commented on HBASE-19997:
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OK the problem is that I forgot to use zk less assignment for 1.4.3. After
setting {{hbase.assignment.usezk}} to true, the rolling upgrade works fine. I
tried the unload/load way, and also killed a RS directly without unloading its
regions, both worked fine, the 1.x master can work together with the 2.x RS.
And at last I restarted the master and upgrade them to 2.1.0, the rolling
upgrade finished successfully.
Will write up a doc about how to do rolling upgrade from 1.x to 2.x soon. And
you can also try it [~stack]. And there is a known issue for 2.1.0-SNAPSHOT,
the SNAPSHOT suffix will be lost in the master page. Filed HBASE-20784 for it,
not a big problem I think.
> [rolling upgrade] 1.x => 2.x
> ----------------------------
>
> Key: HBASE-19997
> URL: https://issues.apache.org/jira/browse/HBASE-19997
> Project: HBase
> Issue Type: Umbrella
> Reporter: stack
> Priority: Blocker
> Fix For: 2.1.0
>
> Attachments: Screenshot from 2018-05-03 14-43-46.png
>
>
> An umbrella issue of issues needed so folks can do a rolling upgrade from
> hbase-1.x to hbase-2.x.
> (Recent) Notables:
> * hbase-1.x can't read hbase-2.x WALs -- hbase-1.x doesn't know the
> AsyncProtobufLogWriter class used writing the WAL -- see
> https://issues.apache.org/jira/browse/HBASE-19166?focusedCommentId=16362897&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16362897
> for exception.
> ** Might be ok... means WAL split fails on an hbase1 RS... must wait till an
> hbase-2.x RS picks up the WAL for it to be split.
> * hbase-1 can't open regions from tables created by hbase-2; it can't find
> the Table descriptor. See
> https://issues.apache.org/jira/browse/HBASE-19116?focusedCommentId=16363276&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16363276
> ** This might be ok if the tables we are doing rolling upgrade over were
> written with hbase-1.
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