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Posted to dev@cassandra.apache.org by weiliang zhang <39...@qq.com> on 2020/08/31 10:07:30 UTC
Problem in updating schema in Cassandra 3.11.4
Hi everyone, I found that cassandra will first flush new schema to disk and then change in memory while updating schema in Cassandra3.11.4 (SchemaKeyspace.java:1378) .
But it seems that cassandra will only validate the schema while changing in memory, and will not validate before flush to disk.
I don't know why not validate before flushing to disk ? Some request will succeed in updating schema to disk and fail to update schema in memory, which will make the schema in disk and schema in memory are not consistent.
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Re: Problem in updating schema in Cassandra 3.11.4
Posted by Aleksey Yeshchenko <al...@apple.com.INVALID>.
I’m reasonably certain that this is one of the things that I fixed in 4.0. It’d be too invasive a change for 3.11, unfortunately.
> On 1 Sep 2020, at 16:52, Benjamin Lerer <be...@datastax.com> wrote:
>
> Hi,
>
> Could you precise what you mean by " will only validate the schema while
> changing in memory, and will not validate before flush to disk.". It is
> unclear to me of which validation you are talking about.
>
>
>
>
>
> On Tue, Sep 1, 2020 at 1:44 PM Weiliang Zhang <39...@qq.com> wrote:
>
>> Does anyone has any ideas?
>>
>> On 2020/08/31 10:07:30, weiliang zhang<39...@qq.com> wrote:
>>> Hi everyone, I found that cassandra will first flush new schema to disk
>> and then change in memory while updating schema in Cassandra3.11.4
>> (SchemaKeyspace.java:1378) .
>>> But it seems that cassandra will only validate the schema while changing
>> in memory, and will not validate before flush to disk.
>>> I don't know why not validate before flushing to disk ? Some request
>> will succeed in updating schema to disk and fail to update schema in
>> memory, which will make the schema in disk and schema in memory are not
>> consistent.
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: dev-unsubscribe@cassandra.apache.org
>>> For additional commands, e-mail: dev-help@cassandra.apache.org
>>>
>>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: dev-unsubscribe@cassandra.apache.org
>> For additional commands, e-mail: dev-help@cassandra.apache.org
>>
>>
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Re: Problem in updating schema in Cassandra 3.11.4
Posted by Benjamin Lerer <be...@datastax.com>.
Hi,
Could you precise what you mean by " will only validate the schema while
changing in memory, and will not validate before flush to disk.". It is
unclear to me of which validation you are talking about.
On Tue, Sep 1, 2020 at 1:44 PM Weiliang Zhang <39...@qq.com> wrote:
> Does anyone has any ideas?
>
> On 2020/08/31 10:07:30, weiliang zhang<39...@qq.com> wrote:
> > Hi everyone, I found that cassandra will first flush new schema to disk
> and then change in memory while updating schema in Cassandra3.11.4
> (SchemaKeyspace.java:1378) .
> > But it seems that cassandra will only validate the schema while changing
> in memory, and will not validate before flush to disk.
> > I don't know why not validate before flushing to disk ? Some request
> will succeed in updating schema to disk and fail to update schema in
> memory, which will make the schema in disk and schema in memory are not
> consistent.
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: dev-unsubscribe@cassandra.apache.org
> > For additional commands, e-mail: dev-help@cassandra.apache.org
> >
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: dev-unsubscribe@cassandra.apache.org
> For additional commands, e-mail: dev-help@cassandra.apache.org
>
>
Re: Problem in updating schema in Cassandra 3.11.4
Posted by Weiliang Zhang <39...@qq.com>.
Does anyone has any ideas?
On 2020/08/31 10:07:30, weiliang zhang<39...@qq.com> wrote:
> Hi everyone, I found that cassandra will first flush new schema to disk and then change in memory while updating schema in Cassandra3.11.4 (SchemaKeyspace.java:1378) .
> But it seems that cassandra will only validate the schema while changing in memory, and will not validate before flush to disk.
> I don't know why not validate before flushing to disk ? Some request will succeed in updating schema to disk and fail to update schema in memory, which will make the schema in disk and schema in memory are not consistent.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: dev-unsubscribe@cassandra.apache.org
> For additional commands, e-mail: dev-help@cassandra.apache.org
>
>
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