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https://issues.apache.org/jira/browse/HBASE-19997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16461907#comment-16461907
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Xiaolin Ha commented on HBASE-19997:
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[~stack]When master rolling from 0.98 to 2.0, 0.98 regionserver open hbase:meta
throws an NPE. Will this problem be solved?
I have made some testing work on rolling from 0.98 to 2.0 and found that,
firstly rolling update regionservers and secondly rolling update masters will
be OK.
Another problem is, will the added 'table' columnfamily make incompatible of
0.98 client working with hbase2 ?
> [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
>
>
> 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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