Re: unusual GC log

What version of C* are you running? any special settings in cassandra.yaml; are you running with stock GC settings in cassandra-env.sh? what JDK/OS? > On Oct 19, 2015, at 11:40 PM, 曹志富 wrote: > > INFO [Service Thread] 2015-10-20 10:42:47,854 GCInspector.java:252 - ParNew

Write timeout on other nodes when joing a new node (in new DC)

Hi all, we are experiencing a strange behavior when we are trying to bootstrap a new node. The problem is that the Recent Write Latency goes to 2s on all the other Cassandra nodes (which are receiving user traffic), which corresponds to our setting of "write_request_timeout_in_ms: 2000". We use

Hiper-V snapshot and Cassandra

Hi, I am really new with Cassandra and i have some questions regarding the backup of Cassandra with TB of info. So please, forgive me if I ask a noob question. I only have one node, in one server (Windows 2012), and Cassandra will grow up to 4TB approx. It is a hiper-v virtual machine, with

Re: Write timeout on other nodes when joing a new node (in new DC)

Hi all, so after deep investigation, we found out that this is this problem https://issues.apache.org/jira/browse/CASSANDRA-8058 Jiri Horky On 10/20/2015 12:00 PM, Jiri Horky wrote: > Hi all, > > we are experiencing a strange behavior when we are trying to bootstrap a > new node. The problem

Cassandra Object Mapper - Dynamically pass keyspace value

Hi All , is there any way i can specify value of keyspace during compile time like using maven build hard coding keyspace name inside the java class is bit not comfortable as if there a change and there are 1000's of files it become a big maintenance issue @UDT (keyspace = "complex", name =

Re: Data visualization tools for Cassandra

For zeppelin check Duy Hai's branch: https://github.com/doanduyhai/incubator-zeppelin/blob/Spark_Cassandra_Demo/README.md All the best, [image: datastax_logo.png] Sebastián Estévez Solutions Architect | 954 905 8615 | sebastian.este...@datastax.com [image:

Re: Read query taking a long time

I think also having the output of cfhistograms could help. I'd like to know how many sstables are being hit during reads. Also, which CL are you reading with? cfstats is a local command, so maybe that node you've printed is working fine but there's another that is causing the latency. Can you

Re: Data visualization tools for Cassandra

Try apache zeppelin. It's a pretty young project but very useful. https://zeppelin.incubator.apache.org/ Include a Cassandra and Spark connector among many others. Mathieu Delsaut *Research Engineer at LE²P* +262 (0)262 93 86 08

Re: Data visualization tools for Cassandra

For more info about Zeppelin, look at my recent presentation slides at Apache Big Data Europe: http://events.linuxfoundation.org/sites/events/files/slides/Apache%20Zeppelin%20-%20The%20missing%20component%20for%20the%20BigData%20ecosystem.pdf The most up-to-date branch to play with

Re: Cassandra users survey

Thanks for all the responses! The results (minus suggestions and emails) are available here: https://docs.google.com/spreadsheets/d/1FegCArZgj2DNAjNkcXi1n2Y1Kfvf6cdZedkMPYQdvC0/edit?usp=sharing I've included charts on separate sheets for each question, but unfortunately I couldn't figure out how

Re: Data visualization tools for Cassandra

Does opscenter has the capability to create custom dashboards based on the data in cassandra tables? I'll look into zeppelin and it's fork by Duy Hai thanks On Tue, Oct 20, 2015 at 10:31 AM, Sebastian Estevez < sebastian.este...@datastax.com> wrote: > For zeppelin check Duy Hai's branch: > > >

Re: Data visualization tools for Cassandra

PySpark (dataframes) + Pandas + Seaborn/Matplotlib > On Oct 20, 2015, at 11:22 AM, Charles Rich wrote: > > Take a look at jKool, a DataStax partner at jKoolCloud.com > . It provides visualization for data in DSE. > > Regards, > > Charley > >

RE: Data visualization tools for Cassandra

Take a look at jKool, a DataStax partner at jKoolCloud.com. It provides visualization for data in DSE. Regards, Charley From: Gene [mailto:gh5...@gmail.com] Sent: Tuesday, October 20, 2015 1:17 PM To: user@cassandra.apache.org Subject: Re: Data visualization tools for Cassandra Have you

Re: Hiper-V snapshot and Cassandra

As long as your hyper-v/vss snapshots include both the data directory and the commit log directory, then they’re exactly as good as tolerating a single power outage – you should be able to load the sstables and replay commit log and be fine. Assuming you’re moving the hyper-v/vss snapshot to

Re: "invalid global counter shard detected" warning on 2.1.3 and 2.1.10

Howdy Cassandra folks. Crickets here and it's sort of unsettling that we're alone with this issue. Is it appropriate to create a JIRA issue for this or is there maybe another way to deal with it? Thanks! On Sun, Oct 18, 2015 at 1:55 PM, Branton Davis wrote: > Hey

Re: "invalid global counter shard detected" warning on 2.1.3 and 2.1.10

Hi Branton, >- How much should we be freaking out? > > The impact of this is possible counter inaccuracy (over counting or under counting). If you are expecting counters to be exactly accurate, you are already in trouble because they are not. This is because of the fact that they are not

Re: Would we have data corruption if we bootstrapped 10 nodes at once?

On Mon, Oct 19, 2015 at 5:42 PM, Robert Coli wrote: > On Mon, Oct 19, 2015 at 9:20 AM, Branton Davis > wrote: > >> Is that also true if you're standing up multiple nodes from backups that >> already have data? Could you not stand up more than

Data visualization tools for Cassandra

Hi, We are looking for data visualization tools to chart some graphs over data present in our cassandra cluster. Are there any open source visualization tools that people are using to quickly draw some charts over data in their cassandra tables? We are using Datastax version of cassandra, in case

Re: Data visualization tools for Cassandra

Have you looked at OpsCenter? On Tue, Oct 20, 2015 at 9:59 AM, Vikram Kone wrote: > Hi, > We are looking for data visualization tools to chart some graphs over data > present in our cassandra cluster. Are there any open source visualization > tools that people are using to

Re: Would we have data corruption if we bootstrapped 10 nodes at once?

On Tue, Oct 20, 2015 at 9:13 AM, Branton Davis wrote: > >> Just to clarify, I was thinking about a scenario/disaster where we lost > the entire cluster and had to rebuild from backups. I assumed we would > start each node with the backed up data and commit log

Re: Would we have data corruption if we bootstrapped 10 nodes at once?

On Tue, Oct 20, 2015 at 3:31 PM, Robert Coli wrote: > On Tue, Oct 20, 2015 at 9:13 AM, Branton Davis > wrote: > >> >>> Just to clarify, I was thinking about a scenario/disaster where we lost >> the entire cluster and had to rebuild from

Re: Changing nodes ips

No idea on the subject ? Is it a current limitation of Cassandra 2.1 ? > On Oct 18, 2015, at 21:58, Cyril Scetbon wrote: > > Hi, > > I want to change the ip addresses (ip v4) that nodes use to discuss (gossip). > I'm trying to migrate from ipv4 to ipv6 for those

[ANNOUNCEMENT] Support for Cassandra added in DB Solo

Hi Everyone, We are pleased to announce support for Cassandra in DB Solo. Some of the supported features include -Browse database structures with a couple of mouse clicks -Write ad-hoc queries in the Query Editor -Multiple simultaneous database connections -Schema scripting tool -Data

Re: Is there any configuration so that local program on C* node can connect using localhost and remote program using IP/name?

On Mon, Oct 19, 2015 at 7:35 PM, Ravi wrote: > > I am using apache-cassandra-2.2.0. You should upgrade to 2.2.3. There were some bugs that you probably want to avoid in 2.2.0. > > Is there any configuration so that local program on C* node can connect > using localhost

Re: Data visualization tools for Cassandra

"From the readme documentation on github , it looks like I need to install spark cluster locally on the zeppelin node. Is that true?" --> It depends on your needs. For production I strongly advise to install

Re: Changing nodes ips

On Tue, Oct 20, 2015 at 1:13 PM, Cyril Scetbon wrote: > No idea on the subject ? Is it a current limitation of Cassandra 2.1 ? > Probably a relatively unusual activity to attempt; not sure if it's "supposed" to work or not. I would probably : 1) file a ticket at

Re: Data visualization tools for Cassandra

​​ Thanks for the link DuyHai >From the readme documentation on github , it looks like I need to install spark cluster locally on the zeppelin node. Is that true? We already have DSE cassandra cluster deployed in

Re: Changing nodes ips

On 10/20/2015 03:13 PM, Cyril Scetbon wrote: I'm trying to migrate from ipv4 to ipv6 for those communications. I tried to follow a similar procedure as the one used at CASSANDRA-8382

RE: Write timeout on other nodes when joing a new node (in new DC)

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Re: Hiper-V snapshot and Cassandra

On Tue, Oct 20, 2015 at 4:22 AM, Raul D'Opazo wrote: > I only have one node, in one server (Windows 2012), and Cassandra will > grow up to 4TB approx. It is a hiper-v virtual machine, with enough > resources. > > This is an extremely unusual and probably

Re: unusual GC log

C* version is 2.1.6. CentOS release 6.5 (Final) Sun JDK 1.7.0_71 64bit. attach is my config setting. Thank you very much!!! -- Ranger Tsao 2015-10-20 15:43 GMT+08:00 Graham Sanderson : > What version of C* are you running? any special

Re: "invalid global counter shard detected" warning on 2.1.3 and 2.1.10

Sebastián, thanks so much for the info! On Tue, Oct 20, 2015 at 11:34 AM, Sebastian Estevez < sebastian.este...@datastax.com> wrote: > Hi Branton, > > >>- How much should we be freaking out? >> >> The impact of this is possible counter inaccuracy (over counting or under > counting). If you

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Re: Read query taking a long time

Hi, Thanks for your answer. Unfortunately since I wrote my e-mail, things are a bit better. This might be because I moved from openjdk 7 to oracle jdk 8 after having seen a warning in the C* log about openjdk, and I also added a node (for other reasons). Now the query itself takes only 1.5s~2s