Many Thanks Jeff for the answer and the relevant details. Can you
please share the bug#?

Are there any opensource tools available for Cassandra which manage
schema changes for Cassandra?

On Fri, Sep 8, 2017 at 7:57 PM, Jeff Jirsa <jji...@gmail.com> wrote:
> There is no lock and it doesn't block existing reads or writes
>
> You're already on 3.11, but as a reminder for others there's a bug in 3.0 
> versions between (3.0.0 and 3.0.14) and (3.0 and 3.11.0) that can cause 
> corruption when you add columns. It's fixed in both 3.11.0 and 3.0.14, so if 
> you need to alter your table and you're on a 3.something version that isn't 
> one of those, upgrade first.
>
> --
> Jeff Jirsa
>
>
>> On Sep 8, 2017, at 7:13 AM, Deepak Panda <deepak.pa...@gmail.com> wrote:
>>
>> Hi,
>>
>> For Cassandra 3.11, when we add a new column is added to an existing
>> table having huge number of rows and huge data manipulation going on
>> will there be any issues?
>>
>> Will the operations blocked till the column is added?
>>
>> Is the table locked during column addition? If yes, what type of lock?
>>
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