We are planning to upgrade HBase 0.94.6/Hadoop2.0 to either 0.96.2/Hadoop2.4 or to 0.98.2/Hadoop2.4. But I have a concern ... The 'stable' is still 0.94.19? Does it mean that both 0.96. and 0.98 are not recommended for production yet? And which one should we take 0.96 or 0.98? I know that 0.96 branch is in bug-fix--only mode right now. One more question: future upgrade from 0.96 -> 1.0 and 0.98 -> 1.0? Rolling or not?
Thank you, in advance
Best regards, Vladimir Rodionov Principal Platform Engineer Carrier IQ, www.carrieriq.com e-mail: [EMAIL PROTECTED]
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Yes. 0.96 -> 1.0 probably won't be supported unless there is explicit interest and work for it. I doubt that will happen. The reason is hfile v3 is default in 1.0, but 0.96 code base cannot read hfile v3 files. This means that rolling restarts is tricky because if a new server writes a new hfile, old servers cannot read this, the region won't be opened and will keep bouncing until it hits a new server. In theory it should work, but I won't recommend doing it.
0.98 -> 1.0 should work with rolling restarts unless we do an explicit decision to drop the support for some reason. I don't imagine there will be a compelling enough reason to drop support for now. https://issues.apache.org/jira/browse/HBASE-11164 tracks this.
On Tue, May 27, 2014 at 2:59 PM, Enis Söztutar <[EMAIL PROTECTED]> wrote: Agree that that is expected to work. It does in our testing. Let us know if issue. We need to fix it if there is a problem. St.Ack
We've tested 0.96 to 0.98 rolling restart also. This is expected to work as long as you don't enable any 0.98 specific features until the whole fleet is running 0.98. On Tue, May 27, 2014 at 3:26 PM, Stack <[EMAIL PROTECTED]> wrote: Best regards,
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