Before I wrote last email, I had initialized a new db with PostgreSQL 
9.4beta2 and restored the pg_dumpall data of /export/pg94beta1_data/


Best Regards!

at 2014-07-28 00:35 +08, Tom Lane wrote:
> =?utf-8?B?5p2O5rW36b6Z?= <hailong...@qunar.com> writes:
>> I have a PostgreSQL datadir named /export/pg94beta1_data/ which was
>> initialized with PostgreSQL 9.4beta1,
>> [ and 9.4beta2 won't start with it ]
> This is expected; you need to initdb.  Or use pg_upgrade to upgrade
> the cluster.  We had to change pg_control format post-beta1.
>                       regards, tom lane

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