Re: Running mixed 4.0 and 4.1 clusters

period, could you say more about what might motivate that? – Scott > On Aug 14, 2023, at 10:26 AM, Doug Whitfield via user > wrote: > > Hi folks, > > I know it is impossible to run 3.x and 4.x nodes in the same cluster. Is it > possible to run 4.0 and 4.1 nodes togeth

Re: Cassandra 4 production settings

recommended given JDK8’s age. – Scott > On Nov 20, 2023, at 12:31 AM, Sébastien Rebecchi > wrote: > > Hello > > There is no such page for Cassandra 4: > https://docs.datastax.com/en/cassandra-oss/3.0/cassandra/install/installRecommendSettings.html > > Do the recommend

Re: UDF related question

Hi Kant, A common pattern in sandboxing (semi-)untrusted code* in Java processes is to make use of a SecurityManager with an associated Policy. These

Re: Open source equivalents of OpsCenter

ify's Reaper https://github.com/spotify/cassandra-reaper re repairs Scott SmartCat - Big Data Development Consulting That Doesn't Suck On Thu, Jul 14, 2016 at 3:48 AM, Michał Łowicki wrote: > My experience while looking for a replacement on > > https://medium.com/@mlowicki/

unsubscribe

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get_paged_slice with SlicePredicate

back? I'd like to page over many rows, but only have data that is contained in a SlicePredicate be returned. Thanks for your help, Scott Fines

Re: counters + replication = awful performance?

ave Cassandra data on a separate disk, commit log and > cache are > >>> currently on the same disk as the system. I experimented with > commit > >>>log > >>> flush modes and even with disabling commit log at all -- but > it doesn't >

Ghost token

Has anyone seen this and know if it is causing an issue or how to fix it? Anytime I run nodetool ring (on any node) I get this extra token show up on the top of the list. Address Status State LoadOwnsToken 113427455640312821154458202477256070484 10.1.2.171 Up

RE: Ghost token

Ahh, thanks. I got questioned on that as soon as our test environment came up and I had no idea. Thanks for the reply. Scott -Original Message- From: Ryan King [mailto:r...@twitter.com] Sent: Friday, May 13, 2011 1:03 PM To: user@cassandra.apache.org Subject: Re: Ghost token

Reboot, now node down 0.8rc1

) at org.apache.cassandra.io.util.ColumnIterator.deserializeNext(ColumnSorted Map.java:261) ... 17 more Cannot load daemon Service exit with a return value of 3 Scott

RE: Reboot, now node down 0.8rc1

n the node and bring it back? Or am I missing completely what the commitlog is? Scott -Original Message- From: Scott McPheeters [mailto:smcpheet...@healthx.com] Sent: Monday, May 23, 2011 2:18 PM To: user@cassandra.apache.org Subject: Reboot, now node down 0.8rc1 I have a test node s

RE: Reboot, now node down 0.8rc1

It was a 0.8beta2 install that last week I upgraded to rc1. I will turn the logging up to debug the next time I have issues to get more details. Thank you. Scott -Original Message- From: aaron morton [mailto:aa...@thelastpickle.com] Sent: Monday, May 23, 2011 6:42 PM To: user

RE: Reboot, now node down 0.8rc1

I have not changed any defaults as of yet. Yes, I do have super columns, but my gc_grace_seconds is default. Scott -Original Message- From: Sylvain Lebresne [mailto:sylv...@datastax.com] Sent: Tuesday, May 24, 2011 8:53 AM To: user@cassandra.apache.org Subject: Re: Reboot, now node

commitlogs not draining

:DEBUG [COMMIT-LOG-WRITER] 2011-07-06 11:04:10,076 CommitLog.java (line 473) Not safe to delete commit log CommitLogSegment(/data/var/lib/cassandra/commitlog/CommitLog-1309288064262.log); dirty is LocationInfo (0), ; hasNext: true -scott

RE: Queue suggestion in Cassandra

ms like ActiveMQ (activemq.apache.org) or RabbitMQ(http://www.rabbitmq.com/). I'm a fan of Kafka myself. Thanks for the menagerie shoutout though...:) Scott Fines From: Milind Parikh [milindpar...@gmail.com] Sent: Friday, September 16, 2011 6:12 PM To: user@cassandra.apache.o

sstable2json weirdness

can massage sstable2json into not emitting duplicates? These duplicates eat a great deal of disk space and processing power to manipulate, which I'd like to avoid. Thanks for your help, Scott

MapReduce with two ethernet cards

t 9160 between Hadoop and Cassandra? Thanks for your help, Scott

seeking contractor to assist with upgrade/expansion

hope this is not off topic? we've been struggling following ostensible procedures for awhile now, ready to pony up for some pro help (but not quite ready to pony up for datastax). please contact me at svd at mylife dot com if you are interested. -scott

RE: MapReduce with two ethernet cards

I upgraded to cassandra 0.8.7, and the problem persists. Scott From: Brandon Williams [dri...@gmail.com] Sent: Monday, October 10, 2011 12:28 PM To: user@cassandra.apache.org Subject: Re: MapReduce with two ethernet cards On Mon, Oct 10, 2011 at 11:47 AM

RE: MapReduce with two ethernet cards

: MapReduce with two ethernet cards What is your rpc_address set to? If it's 0.0.0.0 (bind everything) then that's not going to work if listen_address is blocked. -Brandon On Thu, Oct 13, 2011 at 11:13 AM, Scott Fines wrote: > I upgraded to cassandra 0.8.7, and the problem persis

RE: MapReduce with two ethernet cards

instead of the normal thrift IPs. That leads me to think that I need to have thrift listening on both IPs, though. Would that then be the case? Scott From: Scott Fines [scott.fi...@nisc.coop] Sent: Thursday, October 13, 2011 12:40 PM To: user

RE: MapReduce with two ethernet cards

Looks like that did it, thanks! Scott From: Brandon Williams [dri...@gmail.com] Sent: Thursday, October 13, 2011 2:16 PM To: user@cassandra.apache.org Subject: Re: MapReduce with two ethernet cards On Thu, Oct 13, 2011 at 1:17 PM, Scott Fines wrote

ConcurrentModificationException during nodetool repair

your help, Scott Fines

RE: ConcurrentModificationException during nodetool repair

Created https://issues.apache.org/jira/browse/CASSANDRA-3400 Thanks for your help, Scott Fines From: Sylvain Lebresne [sylv...@datastax.com] Sent: Monday, October 24, 2011 11:37 AM To: user@cassandra.apache.org Subject: Re: ConcurrentModificationException

column family names

(and keyspace names...if there are any such restrictions). If so, where? Thanksinadvance, Scott

Re: column family names

' and perhaps others...if possible)...and then having some minimal docs on the restrictions...in addition to the source...just so that users can easily comply with the restrictions. I'll agree to help with the docs if things are decided. Thanks, Scott On 12/29/2011 9:41 AM, Edw

Re: column family names

I don't necessarily disagree with these personal conventions, but on things like unique names it's my observation that others have other approaches...so in general I think it's desirable to be as weak on these naming restrictions as possible at the lower layers. Scott

JMX BulkLoad weirdness

dle of checking that right now). Is this an error that I should be concerned about? Thanks, Scott

RE: JMX BulkLoad weirdness

or a different machine is something that I don't really want to bother with, if I can activate it through JMX. It seems like the JMX bulkloader works perfectly fine, however, except for the error that I mentioned below. So I suppose I'll ask again, is that error something to be concern

RE: JMX BulkLoad weirdness

cular SSTable in the set was corrupted? Scott From: aaron morton [aa...@thelastpickle.com] Sent: Wednesday, January 18, 2012 1:52 AM To: user@cassandra.apache.org Subject: Re: JMX BulkLoad weirdness I'd need the version number to be sure, but it looks like

Re: Cassandra and disk space

i recently finished a practice expansion of 4 nodes to 5 nodes, a series of "nodetool move", "nodetool cleanup" and jmx gc steps. i found that in some of the steps, disk usage actually grew to 2.5x the base data size on one of the nodes. i'm using 0.6.4. -scott O

Re: Node Inconsistency

e 68). Running "nodetool ring" shows all 5 of them have the same view of the ring. The configuration for the cluster has not changed in quite a while, and we're running 0.6.8 right but were running 0.6.5 for quite a while. Thanks, Scott On Mon, Jan 10, 2011 at 8:27 AM, Tyler Ho

Basic question on distributed delete

rk problems, etc.) in order to have eventual consistency. Thanks, Scott

Re: Basic question on distributed delete

some apparently permanent inconsistencies when we haven't had any known node failures, so I wanted to check on my basic understanding of the distributed delete operation. Thanks, Scott On Wed, Jan 19, 2011 at 2:05 PM, Peter Schuller wrote: > > When we do a delete on a column in the a

Has anyone seen column deletes that seem not to actually delete the column?

snip] This is about 5 minutes after the delete. I definitely can't say that it's not a client-side failure where that exception is getting silently swallowed. My concern is that the delete request makes it to the server but somehow gets lost (on a one node cluster...). Does anyone know if there's a known issue related to losing delete requests? Thanks, Scott

Deleted columns still coming back; CASSANDRA-{1748,1837} alive in 0.6.x?

flush), we have GCGraceSeconds set to 2 days, and read/writes for our tests are CL.ALL. Should we be running nodetool compact also? Thanks, Scott

Re: Deleted columns still coming back; CASSANDRA-{1748,1837} alive in 0.6.x?

ns that aren't supposed to be there on the nodes. At least that's what I've convinced myself of! As far as running flush before repair, I got that idea from the comments in 1748. I'm not convinced at all it's necessary but thought it might help if there was (still?) a problem

How do I repair what looks to be a corrupt sstable index?

ing CL=QUORUM for reads and writes for quite a while. Something tells me it's not as easy as deleting the index file :-) Of course, the bigger question is how did it get this way... Thanks! Scott

Re: Introduce Random latency

it on the network level without having to modify any source(assuming you are on linux). Scott On Wed, Apr 6, 2011 at 11:20 AM, A J wrote: > I want to run some tests where I incorporate random latency in some of > the nodes (that varies over time). I think the best place is to place > a

Re: Cassandra training on May 21 in Palo Alto

10 at 8:50 PM, Jonathan Ellis wrote: >> Yes, although when and where are TBD. >> > > Having it the day before/after Velocity conference at the end of June > would be ideal (hint, hint).  I'm sure a lot of people with interest > in Cassandra will be in the area. > -- -Scott

Re: Cassandra training on May 21 in Palo Alto

So, how about Denver? I would be willing to help get the word out (local user's groups, word of mouth, etc). Thanks, -Scott On Wed, May 5, 2010 at 9:18 AM, Jonathan Ellis wrote: > We're exploring other locations, yes.  I'm skeptical that we can > achieve comparable qual

Apache Cassandra and Net::Cassandra::Easy

ALAR ref while "strict refs" in use at /usr/local/lib/perl5/site_perl/5.10.0/Net/GenThrift/Thrift/BinaryProtocol.pm line 376. '; Help! And thanks! :) -Scott

Re: Apache Cassandra and Net::Cassandra::Easy

opened > recently, and which can perhaps help the performance). > The perl prototype was just to get a general feel for the API & implement something q&d that might actually work for the time being. ( Or so I like to tell myself. :P ) -Scott

Re: Apache Cassandra and Net::Cassandra::Easy

Well, ain't that a kick in the tush. :-/ I grabbed the svn trunk, but build failed, probably because Fedora 11 is too old for this bleeding edge stuff. Server is upgrading itself now, but I wondered: is anyone using an rpm-based distro for Net::Cassandra::Easy and the svn Cassandra? Thanks.

Two threads inserting columns into same key followed by read gets unexpected results

machine as the Cassandra server (running on a dual-core processor). This fails with 0.6.2 code also. Am I wrong in thinking that an insert on a column with consistency level ALL followed immediately by a get_slice should include that column? Thanks Scott McCarty

Requesting data model suggestions

s keys. When an update arrives, the code searches for the key (B or C) in the appropriate table, determines the associated A (using a foreign key), and then updates the values in the table row in A' with key=A. Anyone have ideas about how to model this in Cassandra? Thanks! -- -Scott

curious space usages after recovering a failed node

the question is, do i plan to need 3x headroom for node recoveries? -scott

Re: curious space usages after recovering a failed node

to update, i seem to be having luck with some combination of "cleanup" followed by triggering a garbage collection on jmx (all on each node). (using jxterm): echo -e 'open localhost:8080\nrun -b java.lang:type=Memory gc' | java -jar jmxterm-1.0-alpha-4-uber.jar -scott

recovering a failed node does not seem to recover replicas

er to full than mine. so, i think the wiki isn't quite accurate, and probably should mention the need for at least 2.5x of what is reported by nodetool ring worth of storage to handle recovery of a failed node. -scott

ganglia plugin

forks on a trivial cassandra schema. the patch for the csv enabled gmetric is here: http://bugzilla.ganglia.info/cgi-bin/bugzilla/show_bug.cgi?id=273 -scott

Re: a few generic questions

ormation about data replication. I realize that most of my comments have been "go look for this term" and "go read about this," but I am speaking from experience when I say that this is really the most effective way to learn about Cassandra. Oh, and the other thing, forget everything you think you know about relational databases - Cassandra offers a completely different model. > > Thank you in advance for your help, >  Mario Hope it helps. -Scott

Re: a few generic questions

On Sun, Sep 19, 2010 at 11:53 AM, Scott Mann wrote: > Hi Mario, > > I'll take a shot at answering a few of these, but mostly at this > point, I'd recommend looking at the available documentation. Start at > http://wiki.apache.org/cassandra/FrontPage. > > More com

How to get a list of keys of a CF?

the list of keys? It just seems a bit of overkill to have to pull the entire row, or am I missing something? TIA, -- -Scott

Re: How to get a list of keys of a CF?

Aaron, Thanks. Also for the reminder about tombstones. -- -Scott

Re: Cassandra documentation available

e the list? As I come across things, I'm happy to note them. Good job, by the way! -Scott On Wed, Sep 29, 2010 at 9:14 AM, Guilherme Defreitas wrote: > Hi, > There is an issue in http://www.riptano.com/docs/0.6.5/intro/strengths in > the Reliable chapter. > "Because all node

Re: Newbie Question about restarting Cassandra

fessional privilege > or whose disclosure is prohibited by law. If you are not the intended > recipient you are hereby notified that any read, dissemination, copy or > disclosure of this communication is strictly prohibited by law. If this > message has been received in error, please immediately notify us via e-mail > and delete it.  Internet e-mail neither guarantees the confidentiality nor > the integrity or proper receipt of the messages sent. Yoga Digital S.A.S. > does not assume any liability for those circumstances. > -- -Scott

Re: Clustering in .7 beta 2

Are you aware of this: http://wiki.apache.org/cassandra/JmxGotchas/ ? -Scott

Re: how to delete data

Not that this is much better, but can't you replace steps 1-2 with nodeprobe -flush ? On Wed, Mar 24, 2010 at 2:03 AM, Ran Tavory wrote: > What's the recommended way to delete data? > For example, I want to wipe out an entire column family data from disk with > minimal effort. > I could: > >

ArrayIndexOutOfBoundsException on 0.6-betarc3

in my cluster (see below). Obviously I could take the node out of the cluster and replace it with a new one, but if anyone has suggestions for how to repair the existing machine, that would be appreciated. thanks! Scott Here are some examples: ERROR [ROW-READ-STAGE:3503] 2010-03-26 06:04:1

Re: Newbie Performance Question

fully saturated? Not sure. Scott On Fri, Mar 26, 2010 at 1:00 PM, malcolm smith < malsm...@treehousesystems.com> wrote: > Ok I ran the stress test with out of box settings -- 50 threads and 1M row > inserts. It seems to get as high as 4400 ops per second and as low as 968. > A

Re: Newbie Performance Question

Right, that's what I meant, thanks for the correction. On Fri, Mar 26, 2010 at 1:11 PM, Brandon Williams wrote: > On Fri, Mar 26, 2010 at 3:08 PM, Scott White wrote: > >> Yep I believe those are inserts per second. Take the last line: >> >> "811653,1666,250&q

Re: ArrayIndexOutOfBoundsException on 0.6-betarc3

Nope it's always been random. On Fri, Mar 26, 2010 at 2:13 PM, Jonathan Ellis wrote: > Did you switch partitioner types at some point? > > On Fri, Mar 26, 2010 at 2:53 PM, Scott White wrote: > > I don't know if this is from switching from 0.5 to 0.6-betarc3 just >

Worst case #iops to read a row

Not knowing know anything about the physical layout of the data on disk or how it is accessed when it is read... Could someone who does help estimate the worst case scenario(no caching at any level) for the number of iops to read a row of modest size and modest number of columns in a large col

Re: Worst case #iops to read a row

the row header (bloom filter + column index) if it's a big row, one seek to read the column block (block size is configurable, default is 256KB) On Thu, Apr 8, 2010 at 5:21 PM, Scott Shealy wrote: > Not knowing know anything about the physical layout of the data on disk or > how it

Internal error

week. Also a side question I was curious about, is the state of a boostrap or cleanup operation maintained after restart? thanks, Scott

Re: Worst case #iops to read a row

es what is the worst case "snapshot" of a healthy cluster to analyze. For example, major compactions happen periodically and so iops should degrade all the way up until the next major compaction. It's a very interesting question though and I would love to see this pursued further. Scott

Re: EC2, XFS, and ec2-consistent-snapshot with Cassandra

> I've implemented this with MySQL before, and it worked extremely well > (miles beyond mysqldump or mysqlhotcopy). On a given node, you sacrifice a > short period of availability (less than 0.5 seconds) to get a full, > consistent snapshot of your EBS volume that can be sent off to S3 in the > ba

Re: Bootstraping is failing

Maybe a firewall killing a connection? What does the following show? cat /proc/sys/net/ipv4/tcp_keepalive_time cat /proc/sys/net/ipv4/tcp_keepalive_intvl cat /proc/sys/net/ipv4/tcp_keepalive_probes On Thu, May 7, 2020 at 10:31 AM Surbhi Gupta wrote: > Hi, > > We are trying to expand a datacente

Re: Bootstraping is failing

abc cassandra]# cat /proc/sys/net/ipv4/tcp_keepalive_time > > 300 > > [root@abc cassandra]# cat /proc/sys/net/ipv4/tcp_keepalive_intvl > > 30 > > [root@abc cassandra]# cat /proc/sys/net/ipv4/tcp_keepalive_probes > > 9 > > On Thu, 7 May 2020 at 12:32, Adam Scott

Re: Bootstraping is failing

> > > On Thu, 7 May 2020 at 13:23, Adam Scott wrote: > >> >> *edit >> /etc/sysctl.confnet.ipv4.tcp_keepalive_time=60 >> net.ipv4.tcp_keepalive_probes=3net.ipv4.tcp_keepalive_intvl=10* >> then run sysctl -p to cause the kernel to reload the settings

Re: Bootstraping is failing

dra again on the new node > , will it resume bootstrap or will it start over? > > On Thu, 7 May 2020 at 13:32, Adam Scott wrote: > >> I recommend it on all nodes. This will eliminate that as a source of >> trouble further on down the road. >> >> >> On Thu,

Re: Network Bandwidth and Multi-DC replication

rds > Jens > > Geschäftsführer: Oliver Koch (CEO), Jean-Baptiste Cornefert, Christoph > Ostermann, Hermann Schweizer, Bianca Swanston > Amtsgericht Kempten/Allgäu, Registernummer: 10655, Steuernummer > 127/137/50792, USt.-IdNr. DE272208908 > > > Geschäftsführer: Oliver Ko

Re: 4.0 best feature/fix?

tachment >> and shall not be liable for direct, indirect, consequential or special >> damages in connection with this e-mail message or its attachment. >> >> >> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> >> Virus-free. >> www.avg.com >> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> >> <#m_-3272604231784000544_m_654382365824200109_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >> >> -- Scott Hirleman scott.hirle...@gmail.com

Re: R/W timeouts VS number of tables in keyspace

and may be unlawful. When addressed >> to our clients any opinions or advice contained in this Email are subject >> to the terms and conditions expressed in any applicable governing The Home >> Depot terms of business or client engagement letter. The Home Depot >> disclaims all responsibility and liability for the accuracy and content of >> this attachment and for any damages or losses arising from any >> inaccuracies, errors, viruses, e.g., worms, trojan horses, etc., or other >> items of a destructive nature, which may be contained in this attachment >> and shall not be liable for direct, indirect, consequential or special >> damages in connection with this e-mail message or its attachment. >> > -- Scott Hirleman scott.hirle...@gmail.com

Re: cassandra 4.0 java 11 support

Anecdotally, I have no issues to report running Cassandra 4.0 on JDK11 and would be supportive of removing the "experimental" classification in an upcoming release. From: Erick Ramirez Sent: Tuesday, July 27, 2021 3:57 PM To: user@cassandra.apache.org Su

Re: [RELEASE] Apache Cassandra 4.0.0 released

Thanks Brandon! Anyone know the upgrade path from 3.x? https://cassandra.apache.org/doc/latest/cassandra/getting_started/installing.html Doesn't look like it has specific upgrade instructions. For instance do we need to run nodetool upgradesstables? TIA On 2021/07/26 20:03:59, Brandon Wil

Re: [RELEASE] Apache Cassandra 4.0.0 released

ture, it may be necessary to run upgradesstables prior to upgrading to confirm there are no 3.x SSTables left -- but no such post-4.0 SSTable format changes have been proposed yet. ____ From: Adam Scott Sent: Wednesday, July 28, 2021 2:58 PM To: user@cassa

Re: [RELEASE] Apache Cassandra 4.0.0 released

Thank you Scott! We installed over on top of 3.11 and it's working fine. Easy non-upgrade path :) Thanks again, Adam On 2021/07/28 22:49:11, Scott Andreas wrote: > If you're running Cassandra 3.x, the only data file requirement is that all > SSTables present on your clu

Re: Cassandra Management tools?

I use pssh -i -h hosts nodetool for one-offs. Rolling restart is tricky to automate, but haven't had to yet. If I were to, I would be sure to do a test connect and query to confirm the node is up before going to the next one. For automation I use python fabric. I too, would be curious what othe

Re: Cassandra Summit CFP update

things we build with it. One more thing. We need sponsors! If your employer > can, this is a great opportunity to get your brand out in front of people > building the future. I’ll be back. Go submit a talk. You’ll be happy you > did! Patrick* > -- Scott Hirleman scott.hirle...@gmail.com

Re: Support/Consulting companies

https://www.smartcat.io/ I'll throw our name in the ring; 2 C* MVPs and counting :) On Mon, Aug 22, 2016 at 7:54 AM, Andres de la Peña wrote: > http://www.stratio.com/ > > > On 2016-08-19 20:02 (+0100), Roxy Ubi wrote: > > Howdy, > > > > I'm looking for a list of support or consulting companies

Re: Scalability of Gossip protocol

t;> *To: *"user@cassandra.apache.org" >> *Subject: *Scalability of Gossip protocol >> >> >> >> Hi all; >> >> Please is there a scientific study that evaluates the scalability of >

Re: Upgrading from Cassandra 2.1.12 to 3.0.9

.12 to 3.7. >> >> >> >> I have read the following documentation: >> >> · http://docs.datastax.com/en/latest-upgrade/upgrade/ >> cassandra/upgrdCassandra.html >> >> · https://github.com/apache/cassandra/blob/cassandra-3.7/NEWS.txt >> >> >> >> but still had some questions: >> >> · The upgrdCassandra.html page says : “Upgrade from Cassandra >> 2.1 versions later or equal to 2.1.9 directly to Cassandra 3.0.x”, and I am >> not sure if this includes 3.x, my question is: Can I upgrade directly to >> 3.7? >> >> · Can I run a heterogeneous cluster, with one DC running 2.1.12 >> and another DC running 3.7? >> >> >> >> Thanks, >> >> -Razi >> >> >> > -- *Scott Hirleman* *Head of US Marketing and Sales* www.smartcat.io https://github.com/smartcat-labs <http://www.smartcat.io/> <https://github.com/smartcat-labs>

Re: unsubscribe

That doesn't work. You need to send an email to user-unsubscr...@cassandra.apache.org On Thu, Oct 27, 2016 at 11:22 AM, Anseh Danesharasteh < anseh.dan...@gmail.com> wrote: > unsubscribe > -- *Scott Hirleman* *Head of US Marketing and Sales* www.smartcat.io https://github.

Re: Unsubscribe

That doesn't work. You need to send an email to user-unsubscribe@cassandra. apache.org On Sat, Oct 29, 2016 at 1:53 AM, dhanesh malviya wrote: > > > -- > Regards, > Dhanesh Malviya.. > -- *Scott Hirleman* *Head of US Marketing and Sales* www.smartcat.io https://g

Re: Improving cassandra documentation

eport them? > > Thanks. > > -- > > Oleg Krayushkin > -- *Scott Hirleman* *Head of US Marketing and Sales* www.smartcat.io https://github.com/smartcat-labs <http://www.smartcat.io/> <https://github.com/smartcat-labs>

Re: Improving cassandra documentation

> http://cassandra.apache.org/doc/latest/ > > You can contribute to them directly via git > > On Thu, 3 Nov 2016 at 12:11 SmartCat - Scott Hirleman > wrote: > >> http://docs.datastax.com/en/landing_page/doc/landing_page/contact.html >> Looks like it is still just email d...

Re: Commercial Support Providers?

t;> patched, version of Cassandra that would be ideal, and certainly management >> tools like OpsCenter are a bonus. >> >> The obvious choice here is DataStax, and we’re definitely talking to >> them. Are there any other providers which offer this sort of service? >&g

Re: 99.999% uptime - Operations Best Practices?

s implies extra time and operational cost, hopefully within the boundaries of the revenue stream the system is expected to support. Pardon the long e-mail and for waxing a bit philosophical. I hope this provides some food for thought. - Scott --- C. Scott Andreas Engineer, Urban Airship, Inc.

Flush / Snapshot Triggering Full GCs, Leaving Ring

ng that, and would like to figure out why we see long CMS collections + promotion failures triggering full GCs during a snapshot. Has anyone seen this, or have suggestions on how to prevent full GCs from occurring during a flush / snapshot? Thanks, - Scott --- C. Scott Andreas Engineer, Urban Airship, Inc. http://www.urbanairship.com

Re: state of incremental repairs in cassandra 3.x

Hi James, thanks for reaching out.A large number of fixes have landed for Incremental Repair in the 3.x series, though it's possible some may have been committed to 4.0 without a backport. Incremental repair works well on Cassandra 4.0.1. I'd start here to ensure you're picking up all fixes tha

Re: gc throughput

Hi, I noticed that you mentioned your goal is to optimize write throughput, and that you're using Cassandra 3.11.2.Optimizing for write throughput is usually a proxy for optimizing for compaction, as the cost of writes are very cheap but compacting to keep up with it can be pretty expensive.You'

Re: Hanging repairs in Cassandra

release in the 3.11 series at minimum (3.11.11). You may find that the issue is resolved; or if not, be able to draw upon the community’s knowledge of a current release of the database. — Scott > On Jan 21, 2022, at 8:51 PM, manish khandelwal > wrote: >  > Hi All > > After

Re: Query timed out after PT2M

Hi Joe, it looks like "PT2M" may refer to a timeout value that could be set by your Spark job's initialization of the client. I don't see a string matching this in the Cassandra codebase itself, but I do see that this is parseable as a Duration.```jshell> java.time.Duration.parse("PT2M").getSeco

Re: Cassandra 3.0.14 transport completely blocked

Hi Jaydeep, thanks for reaching out.The most notable deadlock identified and resolved in the last few years is https://issues.apache.org/jira/browse/CASSANDRA-15367: Memtable memory allocations may deadlock (fixed in Apache Cassandra 3.0.21).Mentioning for completeness - since the release of Cas

Re: Datastax Java Driver Compatibility Matrix

The DataStax Java 3.x drivers work very well with Apache Cassandra 4.0. I'd recommend one of the more recent releases in the series, though (e.g., 3.6.x+).I'm not the author of this documentation, but it may refer to the fact that the 3.x Java Driver supports the CQL v4 wire protocol, but not t

Re: Datastax Java Driver Compatibility Matrix

tOn Apr 19, 2022, at 11:45 AM, Jai Bheemsen Rao Dhanwada wrote:Thank you Scott for the information.I am currently using the 3.2 version of Datastax Driver and using the Cluster Builder with Protocol Version V3. Does this mean 3.2 with protocol version v3 can still work with Cassandra4.0 server?Als

Re: Gossip issues after upgrading to 4.0.4

Hi Gil, thanks for reaching out.Can you check Cassandra's logs to see if any uncaught exceptions are being thrown? What you described suggests the possibility of an uncaught exception being thrown in the Gossiper thread, preventing further tasks from making progress; however I'm not aware of any

Re: Cassandra 3.0 upgrade

on a great 3.0.x build. If all looks good from there, you should have an easy upgrade to 4.0.4. I would not recommend passing through intermediate 3.0.x releases on the way to 3.0.27; doing so is not necessary. Cheers, - Scott > On Jun 13, 2022, at 10:17 PM, Runtian Liu wrote: > &g

Re: Cassandra 3.0 upgrade

. - Scott > On Jun 13, 2022, at 10:36 PM, Jaydeep Chovatia > wrote: > >  > Thanks Jeff and Scott for valuable feedback! > One more question, do we have to upgrade the dTest repo if we go to 3.0.27, > or the one we have currently already working with 3.0.14 should continue to >

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