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From Stack <st...@duboce.net>
Subject Re: Rolling restart from 0.92 to 0.94
Date Wed, 04 Sep 2013 21:39:15 GMT
On Thu, Sep 5, 2013 at 5:00 AM, lars hofhansl <larsh@apache.org> wrote:

> Shrijeet Paliwal just pointed me to this section in the HBase bookhttp://
> hbase.apache.org/upgrading.html#upgrade0.94 (thanks Shrijeet):
>
>
> ----
> 1.3. Upgrading from 0.92.x to 0.94.x
> We used to think that 0.92 and 0.94 were interface compatible and that you
> can do a rolling upgrade between these versions but then we figured that
> HBASE-5357 Use builder pattern in HColumnDescriptor changed method
> signatures so rather than return void they instead return
> HColumnDescriptor.  This will throw
> java.lang.NoSuchMethodError:
> org.apache.hadoop.hbase.HColumnDescriptor.setMaxVersions(I)V
> .... so 0.92 and 0.94 are NOT compatible.  You cannot do a rolling upgrade
> between them.
> ----
>
>
> Is that statement actually correct? The issue here is binary code
> compatibility, which we indeed do not support, but which does not impede
> rolling upgrades between versions (as long as we're wire compatible between
> releases, which we are).
>

The statement overreaches with its absolute that the two are NOT
compatible.  If someone suggests text, I'll update the refguide.
St.Ack

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