Re: Introducing Cassandra 3.7 LTS

Wow, thank you for doing this. This sentiment regarding stability seems to be widespread. Is the team reconsidering the whole tick-tock cadence? If not, I would add my voice to those asking that it is revisited. Steve On Wed, Oct 19, 2016 at 1:00 PM Matija Gobec wrote: >

Re: Introducing Cassandra 3.7 LTS

+1 On Wed, Oct 19, 2016 at 2:07 PM, sfesc...@gmail.com wrote: > Wow, thank you for doing this. This sentiment regarding stability seems to > be widespread. Is the team reconsidering the whole tick-tock cadence? If > not, I would add my voice to those asking that it is

Re: Introducing Cassandra 3.7 LTS

Hi Ben, Thanks for this awesome contribution. I'm eager to give it a try and test it out. Best, Matija On Wed, Oct 19, 2016 at 8:55 PM, Ben Bromhead wrote: > Hi All > > I am proud to announce we are making available our production build of > Cassandra 3.7 that we run at

Re: Speeding up schema generation during tests

Thanks. I've disabled durable writes but this is still pretty slow (about 10 seconds). What issues did you run into with your impl? On Wed, Oct 19, 2016 at 12:15 PM, DuyHai Doan wrote: > There is a lot of pre-flight checks when starting the cassandra server and > they

Re: Speeding up schema generation during tests

Have you tried starting Cassandra with -Dcassandra.unsafesystem=true ? On Wed, Oct 19, 2016 at 9:31 AM, DuyHai Doan wrote: > As I said, when I bootstrap the server and create some keyspace, sometimes > the schema is not fully initialized and when the test code tried to

Re: Speeding up schema generation during tests

There is a lot of pre-flight checks when starting the cassandra server and they took time. For integration testing, I have developped a modified CassandraDeamon here that remove pretty most of those checks:

Re: Speeding up schema generation during tests

Horschi, you are the hero gotham deserves. Test time reduced from 10 seconds to 800 ms On Wed, Oct 19, 2016 at 12:40 PM, horschi wrote: > Have you tried starting Cassandra with -Dcassandra.unsafesystem=true ? > > > On Wed, Oct 19, 2016 at 9:31 AM, DuyHai Doan

Re: WARN [SharedPool-Worker-3] AbstractTracingAwareExecutorService.java

"which appilcation is trying to write large writes and to which keyspace and table it is trying to write ??" --> I don't think there is something such as audit trail for each CQL query. You may want to enable slow query logger on the client side (driver side) and bet on the fact that the queries

Re: Speeding up schema generation during tests

As I said, when I bootstrap the server and create some keyspace, sometimes the schema is not fully initialized and when the test code tried to insert data, it fails. I did not have time to dig into the source code to find the root cause, maybe it's something really stupid and simple to fix. If

Re: Speeding up schema generation during tests

Ohh didn't know such system property exist, nice idea! On Wed, Oct 19, 2016 at 9:40 AM, horschi wrote: > Have you tried starting Cassandra with -Dcassandra.unsafesystem=true ? > > > On Wed, Oct 19, 2016 at 9:31 AM, DuyHai Doan wrote: > >> As I said,

problem starting incremental repair using TheLastPicke Reaper

is there a way to start the incremental repair using the reaper. we completed full repair successfully and after that i tried to run the incremental run but getting the below error. A repair run already exist for the same cluster/keyspace/table but with a different incremental repair

Re: problem starting incremental repair using TheLastPicke Reaper

Hi Abhishek, This shows you have two repair units for the same keyspace/table with different incremental repair settings. Can you delete your prior repair run (the one with incremental repair set to false) and then create the new one with incremental repair set to true ? Let me know how that

Re: quick question

The coordinator can optimize latency for a SELECT by asking data from the lowest-latency replica using DynamicSnitch. It's not really load balancing per se but it's the closest idea.

Re: problem starting incremental repair using TheLastPicke Reaper

Hi Alex, that i already did and it worked but my question is if the passed value of incremental repair flag is different from the existing value then it should allow to create new repair_unit instead of getting repair_unit based on cluster name/ keyspace /column combination. and also if i

Re: quick question

What exactly do you mean by "resource usage"? If you mean "data size on disk" - no. If you mean "current CPU usage" - it depends on query. Modify query should be be sent to all nodes owning specific partition key. For read queries see

Re: Is there any way to throttle the memtable flushing throughput?

Hi, Ben Thank you for your reply. > The AWS instance type you are using is not appropriate for a production workload I agree with you. I use it for a just verification of the C* behavior. So I really want to understand the actual mechanism of the write request blocking. I would appreciate if

quick question

can Cassandra cluster direct or load balance the requests by detecting the resource usage of a particular node?

Re: quick question

I mean disk/cpu/network usage but I understand what Dynamic snitch does! On Wed, Oct 19, 2016 at 3:34 AM, Vladimir Yudovin wrote: > What exactly do you mean by "resource usage"? If you mean "data size on > disk" - no. > If you mean "current CPU usage" - it depends on

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Re: Introducing Cassandra 3.7 LTS

Awesome! On Wed, Oct 19, 2016 at 2:57 PM Jason J. W. Williams < jasonjwwilli...@gmail.com> wrote: > +1 > > On Wed, Oct 19, 2016 at 2:07 PM, sfesc...@gmail.com > wrote: > > Wow, thank you for doing this. This sentiment regarding stability seems to > be widespread. Is the team

Re: Introducing Cassandra 3.7 LTS

On 19 October 2016 at 21:07, sfesc...@gmail.com wrote: > Wow, thank you for doing this. This sentiment regarding stability seems to > be widespread. Is the team reconsidering the whole tick-tock cadence? If > not, I would add my voice to those asking that it is revisited.

Re: How to insert "Empty" timeuuid by Cql

Hi Vladimir, Indeed, that's a little weird, I think it is like a empty string: '' but is a timeuuid value. We have many such records that inserted by Astyanax API, when we select it in cqlsh, it is like as below, note the column4 is timeuuid, it is not null or some value, just "empty". key

Re: How to insert "Empty" timeuuid by Cql

Have you already tried using unset values? http://www.datastax.com/dev/blog/datastax-java-driver-3-0-0-released#unset-values They are only available starting with protocol version 4 however. On Thu, Oct 20, 2016 at 10:19 AM, Lijun Huang wrote: > Hi Vladimir, > > Indeed,

Re: How to insert "Empty" timeuuid by Cql

Thanks Stefania, we haven't tried before, and I think the version is not matched, we are still using, [cqlsh 4.1.1 | Cassandra 2.1.11 | CQL spec 3.1.1 | Thrift protocol 19.39.0] On Thu, Oct 20, 2016 at 10:33 AM, Stefania Alborghetti < stefania.alborghe...@datastax.com> wrote: > Have you already

Re: How to insert "Empty" timeuuid by Cql

You're correct, cassandra 2.1 is still using protocol version 3. You need at least version 2.2. On Thu, Oct 20, 2016 at 11:18 AM, Lijun Huang wrote: > Thanks Stefania, we haven't tried before, and I think the version is not > matched, we are still using, > [cqlsh 4.1.1 |

Re: non incremental repairs with cassandra 2.2+

Hi Kurt, we're not actually. Reaper performs full repair by subrange but does incremental repair on all ranges at once, node by node. Subrange is incompatible with incremental repair anyway. Cheers, On Thu, Oct 20, 2016 at 5:24 AM kurt Greaves wrote: > > On 19 October

Re: non incremental repairs with cassandra 2.2+

On 19 October 2016 at 17:13, Alexander Dejanovski wrote: > There aren't that many tools I know to orchestrate repairs and we maintain > a fork of Reaper, that was made by Spotify, and handles incremental repair > : https://github.com/thelastpickle/cassandra-reaper Looks

Re: WARN [SharedPool-Worker-3] AbstractTracingAwareExecutorService.java

Thanks Doan, will try to enable slow query for app side and will let you know if it helps or not. Thanks James. On Wed, Oct 19, 2016 at 2:59 AM, DuyHai Doan wrote: > "which appilcation is trying to write large writes and to which keyspace > and table it is trying to

Re: How to insert "Empty" timeuuid by Cql

Hi, what does it exactly mean 'empty timeuuid'? UUID takes 16 bytes for storage, so it should be either null, or some value. Do you mean 'zero' UUID? Best regards, Vladimir Yudovin, Winguzone - Hosted Cloud Cassandra Launch your cluster in minutes. On Wed, 19 Oct 2016 09:16:29

How to insert "Empty" timeuuid by Cql

Hi all, We use Cassandra 2.1.11 in our product, and we update the Java Drive from Astyanax(Thrift API) to DataStax Java Driver(Cql) recently, but we encounter a difficult issue as following, please help us, thanks in advance. Previously we were using Astyanax API, and we can insert empty

Re: problem starting incremental repair using TheLastPicke Reaper

Abhishek, can you file an issue on our github repo so that we can further discuss this ? https://github.com/thelastpickle/cassandra-reaper/issues Thanks, On Wed, Oct 19, 2016 at 1:20 PM Abhishek Aggarwal < abhishek.aggarwa...@snapdeal.com> wrote: > Hi Alex, > > that i already did and it worked

non incremental repairs with cassandra 2.2+

Hey, We are upgrading from cassandra 2.1 to cassandra 2.2. With cassandra 2.1 we would periodically repair all nodes, using the -pr flag. With cassandra 2.2, the same repair takes a very long time, as cassandra does an anti compaction after the repair. This anti compaction causes most

Re: non incremental repairs with cassandra 2.2+

There aren't that many tools I know to orchestrate repairs and we maintain a fork of Reaper, that was made by Spotify, and handles incremental repair : https://github.com/thelastpickle/cassandra-reaper We just added Cassandra as storage back end (only postgres currently) in one of the branches,

Re: non incremental repairs with cassandra 2.2+

Sorry I shouldn't have said adding a node. Sometimes data seems to be corrupted or inconsistent in which case would like to run a repair. Sent from my iPhone > On Oct 19, 2016, at 10:10 AM, Sean Bridges > wrote: > > Thanks, we will try that. > > Sean > >> On

Re: non incremental repairs with cassandra 2.2+

Thanks! How do I do an incremental repair when I add a new node? Sent from my iPhone > On Oct 19, 2016, at 9:54 AM, Alexander Dejanovski > wrote: > > Hi Kant, > > subrange is a form of full repair, so it will just split the repair process > in smaller yet sequential

Re: non incremental repairs with cassandra 2.2+

Thanks, we will try that. Sean On 16-10-19 09:34 AM, Alexander Dejanovski wrote: Hi Sean, you should be able to do that by running subrange repairs, which is the only type of repair that wouldn't trigger anticompaction AFAIK. Beware that now you will have sstables marked as repaired and

Re: non incremental repairs with cassandra 2.2+

Also any suggestions on a tool to orchestrate the incremental repair? Like say most commonly used Sent from my iPhone > On Oct 19, 2016, at 9:54 AM, Alexander Dejanovski > wrote: > > Hi Kant, > > subrange is a form of full repair, so it will just split the repair

Re: non incremental repairs with cassandra 2.2+

Can you explain why you would want to run repair for new nodes? Aren't you talking about bootstrap, which is not related to repair actually? Le mer. 19 oct. 2016 18:57, Kant Kodali a écrit : > Thanks! How do I do an incremental repair when I add a new node? > > Sent from my

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Re: non incremental repairs with cassandra 2.2+

Hi Sean, you should be able to do that by running subrange repairs, which is the only type of repair that wouldn't trigger anticompaction AFAIK. Beware that now you will have sstables marked as repaired and others marked as unrepaired, which will never be compacted together. You might want to

Re: non incremental repairs with cassandra 2.2+

Another question on a same note would be what would be the fastest way to do repairs of size 10TB cluster ? Full repairs are taking days. So among repair parallel or repair sub range which is faster in the case of say adding a new node to the cluster? Sent from my iPhone > On Oct 19, 2016, at

Re: non incremental repairs with cassandra 2.2+

Hi Kant, subrange is a form of full repair, so it will just split the repair process in smaller yet sequential pieces of work (repair is started giving a start and end token). Overall, you should not expect improvements other than having less overstreaming and better chances of success if your

Cassandra Read / Write Benchmarks with Stress - Public listing

Hi, Is there any public listing of cassandra performance test results with cstar or cassandra-stress for read and write, with mention of configurations modified from default and cassandra version. It would be useful to not redo and do optimisations for cassandra wrt Threadpools / JVM tuning /

Introducing Cassandra 3.7 LTS

Hi All I am proud to announce we are making available our production build of Cassandra 3.7 that we run at Instaclustr (both for ourselves and our customers). Our release of Cassandra 3.7 includes a number of backported patches from later versions of Cassandra e.g. 3.8 and 3.9 but doesn't include

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