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Posted to user@cassandra.apache.org by Katriel Traum <ka...@google.com> on 2014/04/29 09:57:04 UTC

Migrating from Snappy to LZ4 on C* 1.2

Hello,

I am running mostly Cassandra 1.2 on my clusters, and wanted to migrate my
current Snappy compressed CF's to LZ4.

Changing the schema is easy, my questions are:
1. Will previous, Snappy compressed tables still be readable?
2. Will upgradesstables convert my current CFs from Snappy to LZ4? Or do I
have to run major compaction?

Thanks,
Katriel

Re: Migrating from Snappy to LZ4 on C* 1.2

Posted by Katriel Traum <ka...@google.com>.

Thanks for the answer.

I've tested it by myself now, and indeed it works.
Only note I have is that you have to run "nodetool upgradesstables -a", so
all sstables are updated.

Katriel


On Tue, Apr 29, 2014 at 12:22 PM, Alain RODRIGUEZ <ar...@gmail.com>wrote:

> Hi, I would say:
>
> 1 - Yes
> 2 - Yes (No major compaction needed, upgradesstables should do the job)
>
> As always in case of doubt, as always, test it. ìn this case you can even
> do it using a local machine.
>
> Alain
>
>
> 2014-04-29 9:57 GMT+02:00 Katriel Traum <ka...@google.com>:
>
> Hello,
>>
>> I am running mostly Cassandra 1.2 on my clusters, and wanted to migrate
>> my current Snappy compressed CF's to LZ4.
>>
>> Changing the schema is easy, my questions are:
>> 1. Will previous, Snappy compressed tables still be readable?
>> 2. Will upgradesstables convert my current CFs from Snappy to LZ4? Or do
>> I have to run major compaction?
>>
>> Thanks,
>>  Katriel
>>
>
>

Re: Migrating from Snappy to LZ4 on C* 1.2

Posted by Alain RODRIGUEZ <ar...@gmail.com>.

Hi, I would say:

1 - Yes
2 - Yes (No major compaction needed, upgradesstables should do the job)

As always in case of doubt, as always, test it. ìn this case you can even
do it using a local machine.

Alain


2014-04-29 9:57 GMT+02:00 Katriel Traum <ka...@google.com>:

> Hello,
>
> I am running mostly Cassandra 1.2 on my clusters, and wanted to migrate my
> current Snappy compressed CF's to LZ4.
>
> Changing the schema is easy, my questions are:
> 1. Will previous, Snappy compressed tables still be readable?
> 2. Will upgradesstables convert my current CFs from Snappy to LZ4? Or do I
> have to run major compaction?
>
> Thanks,
>  Katriel
>