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

it is 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

get_paged_slice with SlicePredicate

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?

/facebook -- *Scott McKay*, Sr. Software Developer MailChannels Tel: +1 604 685 7488 x 509 www.mailchannels.com

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

:87) 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

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 system

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

) 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.org Subject: Re: Queue

sstable2json weirdness

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

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 scott.fi...@nisc.coop wrote: I upgraded to cassandra 0.8.7, and the problem

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 scott.fi

ConcurrentModificationException during nodetool repair

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

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

Re: column family names

...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, Edward Capriolo wrote: Use the source

Re: column family names

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

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

RE: JMX BulkLoad weirdness

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 concerned about? Thanks, Scott

RE: JMX BulkLoad weirdness

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 that error

Re: Newbie Question about restarting Cassandra

-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: 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 On Thu, 9 Dec 2010, Rustam

Basic question on distributed delete

, Scott

Re: Basic question on distributed delete

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 peter.schul...@infidyne.com wrote: When we do a delete on a column in the above configuration, the call

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

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?

, 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?

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 in 0.6.10 code. --Scott On Mon, Feb 7, 2011 at 2:31

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 s5a...@gmail.com 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

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 ran...@gmail.com 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

Re: Newbie Performance Question

? 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. Am I reading these correctly as inserts

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

Re: Worst case #iops to read a row

one seek to read 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 spshe...@yahoo.com wrote: Not knowing know anything about the physical layout of the data

Re: Worst case #iops to read a row

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

Re: Cassandra training on May 21 in Palo Alto

:50 PM, Jonathan Ellis jbel...@gmail.com 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

Apache Cassandra and Net::Cassandra::Easy

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

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

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

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

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 On Mon, 16 Aug 2010

Re: a few generic questions

On Sun, Sep 19, 2010 at 11:53 AM, Scott Mann sdm...@gmail.com 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 comments below. Removal

How to get a list of keys of a CF?

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

? 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 guilherme.defrei...@gmail.com wrote: Hi, There is an issue in http://www.riptano.com/docs/0.6.5/intro/strengths in the Reliable chapter. Because all nodes

unsubscribe

Scott Thompson This message and any attached documents are only for the use of the intended recipient(s), are confidential and may contain privileged information. Any unauthorized review, use, retransmission, or other disclosure is strictly prohibited

Re: Open source equivalents of OpsCenter

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 <mlowi...@gmail.com> wrote: > My experience while looking for a replacement on > > https://medium.com/@mlowic

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: Bootstraping is failing

gt; nodes ? > > > 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

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

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 Scot

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?

hall 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_source=link_campaign=sig-email_content=emailclient> >> Virus-free. >> www.avg.com >> <http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=emailclient> >> <#m_-3272604231784000544_m_654382365824200109_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >> >> -- Scott Hirleman scott.hirle...@gmail.com

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 cluster are 3

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

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

Re: [RELEASE] Apache Cassandra 4.0.0 released

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@cassandra.apache.org

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

wful. 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 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

Re: Cassandra Summit CFP update

uild 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: 99.999% uptime - Operations Best Practices?

food for thought. - Scott --- C. Scott Andreas Engineer, Urban Airship, Inc. http://www.urbanairship.com On Jun 22, 2011, at 4:16 PM, Les Hazlewood wrote: On Wed, Jun 22, 2011 at 4:11 PM, Peter Lin wool...@gmail.com wrote: you have to use multiple data centers to really deliver 4 or 5 9's

Flush / Snapshot Triggering Full GCs, Leaving Ring

+ 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: 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

Re: Upgrading from Cassandra 2.1.12 to 3.0.9

t;> >> Hello all, >> >> >> >> I would like to upgrade my Cassandra cluster from 2.1.12 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: Scalability of Gossip protocol

ra.apache.org" <user@cassandra.apache.org> >> *Date: *Tuesday, August 16, 2016 at 12:07 PM >> *To: *"user@cassandra.apache.org" <user@cassandra.apache.org> >> *Subject: *Scalability of Gossip protocol >> >> >> >> Hi all; >> >

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 <dnesh...@gmail.com> wrote: > > > -- > Regards, > Dhanesh Malviya.. > -- *Scott Hirleman* *Head of US Marketing and Sale

Re: Improving cassandra documentation

t & easy way to report 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

he Cassandra website: > 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 <sc...@smartcat.io> > wrote: > >> http://docs.datastax.com/en/landing_page/doc/landing_page/contac

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.com/s

Re: Commercial Support Providers?

ling, etc). If they offer their own tested, supported, >> 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 an

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

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

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

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>

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 > > A

Re: [HELP] Cassandra 4.1.1 Repeated Bootstrapping Failure

Bowen, thanks for reaching out.My mind immediately jumped to a ticket which has very similar pathology: "CASSANDRA-18110: Streaming progress virtual table lock contention can trigger TCP_USER_TIMEOUT and fail streaming" -- but I see this was fixed in 4.1.1.On Sep 11, 2023, at 2:09 PM, Bowen

Re: Upgrade from C* 3 to C* 4 per datacenter

tested upgrade path used by nearly everyone is a replica-safe rolling restart of instances in each datacenter, one datacenter at a time. Could you say more about the concerns you have with this upgrade path, or the worries you are hoping to mitigate? – Scott On Oct 26, 2023, at 8:32 AM, "Michalis

Re: Big Data Question

A few thoughts on this:– 80TB per machine is pretty dense. Consider the amount of data you'd need to re-replicate in the event of a hardware failure that takes down all 80TB (DIMM failure requiring replacement, non-reduntant PSU failure, NIC, etc).– 24GB of heap is also pretty generous.

Re: Open File Descriptors not cleared post upgrade from 3.11.9 to 4.0.5.

Vaibhav, thank you for reaching out and sharing this issue report.Could you run an `lsof` and share which SSTable files you see open (e.g., all SSTable components or a subset of them); and also share the value of the `disk_access_mode` property from your cassandra.yaml?Opening a Jira ticket

Re: Unsubscribe

Hi Mark,You can unsubscribe from this mailing list by sending a blank email to "user-unsubscr...@cassandra.apache.org" from the address that is subscribed to the list. Other members of the list are not able to take this action on someone's behalf.Details on how to join and leave lists are

Re: Testing Cassandra connectivity at application startup

“select * from …” without a predicate from a user table would be very expensive, yes. A query from a small, node-local system table such as “select * from system.peers” would make a better health check.  - Scott > On Aug 25, 2023, at 10:58 AM, Raphael Mazelier wrote: > >

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

Re: Datastax Java Driver Compatibility Matrix

, 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?Also from

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 >

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

Re: Change the compression algorithm on a production table at runtime

Thanks for reaching out. Changing the compressor for a table is both safe and common. Future flushes / compactions will use the new codec as SSTables are written, and SSTables currently present on disk will remain readable with the previous codec. You may also want to take a look at the

Re: Understanding multi region read query and latency

> but still as I understand the documentation the read repair should not be in the blocking path of a query ?Read repair is in the blocking read path for the query, yep. At quorum consistency levels, the read repair must complete before returning a result to the client to ensure the data returned

Re: Cassandra 4.0 upgrade - Upgradesstables

No downside at all for 3.x -> 4.x (however, Cassandra 3.x reading 2.1 SSTables incurred a performance hit).Many users of Cassandra don't run upgradesstables after 3.x -> 4.x upgrades at all. It's not necessary to run until a hypothetical future time if/when support for reading Cassandra 3.x

Re: Compactions are stuck in 4.0.5 version

Hi Vaibhav, thanks for reaching out.Based on my understanding of this exception, this may be due to the index for this partition exceeding 2GiB (which is *extremely* large for a partition index component).Reducing the size of the column index below 2GiB may resolve this issue. You may be able

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