Hello,
Where can I find information about overhead of data types in cassandra?
I am interested about blob, text, uuid, timeuuid data types. Does a blob
type store a value with the length of the blob data? If yes then which type
of the length it is using (int, bigint)?
If I want to store 80 bits ho
Hi again Chris,
Another option would be to have a look at using a Merkle Tree to quickly
drill down to the differences. This is actually what Cassandra uses
internally when running a repair between different nodes.
Cheers,
Jens
On Wed, Sep 7, 2016 at 9:47 AM wrote:
> First off I hope this appr
The thing is, this isn't about opinions. I don't really want to get into
an argument either, but characterising my statements as opinion does invite
me to respond with their factual basis... The only legitimate opinions
here would be around the prevalence of cluster characteristics, of which we
b
Hi,
Apologies for a dev related hijack. We can continue the dev related
discussion in JIRA or the dev list.
Seeing this discussion makes me think that Benedict and Ryan you will
both have opinions about
https://issues.apache.org/jira/browse/CASSANDRA-12372 (remove
memtable_cleanup_threshold, not
You can find the information about that in Cassandra source code, for
example. Search for serializers, like BytesSerializer:
https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/serializers/BytesSerializer.java
to
get an idea how the data is serialized.
But I'd also check o
* I have a keyspace with RF=2;
* The client read the table using LOCAL_ONE;
* There is a batch job loading data into the tables using ALL.
I want to change RF to 3 and both the client and the batch job use
LOCAL_QUORUM.
My question is "Will the client still read the correct data when the repair
i
Hi,
If you change RF=2 -> 3 first, the LOCAL_ONE reads might hit the new replica
which is not there yet. So I would change LOCAL_ONE -> LOCAL_QUORUM first and
then change the RF and then run the repair. LOCAL_QUORUM is effectively ALL in
your case (RF=2) if you have just one DC, so you can chan
Thanks Hannu,
Unfortunately, we started changing RF from 2 to 3, and did see the empty
result rate is going higher. I assume that "If the LOCAL_ONE read hit the
new replica which is not there yet, the CQL query will return nothing." Is
my assumption correct?
On Thu, Sep 8, 2016 at 11:49 AM, Hann
Yep, you can fix it by running repair or even faster by changing the
consistency level to local_quorum and deploying the new version of the app.
Hannu
> On 8 Sep 2016, at 17:51, Benyi Wang wrote:
>
> Thanks Hannu,
>
> Unfortunately, we started changing RF from 2 to 3, and did see the empty
>
Thanks. What about this situation:
* Change RF 2 => 3
* Start repair
* Roll back RF 3 => 2
* repair is still running
I'm wondering what the repair is trying to do? The repair is trying to fix
as RF=2 or still trying to fix like RF=3?
On Thu, Sep 8, 2016 at 2:53 PM, Hannu Kröger wrote:
> Yep, y
Ok, so I have to say that I’m not 100% sure how many replicas of data is it
trying to maintain but it should not blow up (if repair crashes or something,
it’s ok). So it should be safe to do.
When the repair has run you can start with the plan I suggested and run repairs
afterwards.
Hannu
> O
Thanks a lot. Will do as you suggested.
On Thu, Sep 8, 2016 at 3:08 PM, Hannu Kröger wrote:
> Ok, so I have to say that I’m not 100% sure how many replicas of data is
> it trying to maintain but it should not blow up (if repair crashes or
> something, it’s ok). So it should be safe to do.
>
> Wh
Hi,
Disk-wise it's the same because a bigint is serialized as a 8 bytes ByteBuffer
and if you want to store a Long as bytes into a blob type it will take 8 bytes
too, right?The difference is the validation. The blob ByteBuffer will be stored
as is whereas the bigint will be validated. So technic
Is there any way to get partition size for a partition key ?
Hello Romain,
Thank you very much for the explanation!
I have just run a simple test to compare both situations.
I have run two VM equivalent machines.
Machine 1:
CREATE KEYSPACE "test" WITH REPLICATION = { 'class' : 'SimpleStrategy',
'replication_factor' : 1 };
CREATE TABLE test.simple (
id b
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