>
>
> -Original Message-
> From: Mateusz
> Sent: Friday, September 14, 2018 2:40 AM
> To: user@cassandra.apache.org
> Subject: [EXTERNAL] Re: cold vs hot data
>
> On piątek, 14 września 2018 02:46:43 CEST Alaa Zubaidi (PDF) wrote:
> > The data can grow to +100T
Let me check lvmcache..Thanks
On Thu, Sep 13, 2018 at 11:39 PM, Mateusz
wrote:
> On piątek, 14 września 2018 02:46:43 CEST Alaa Zubaidi (PDF) wrote:
> > The data can grow to +100TB however the hot data will be in most cases
> less
> > than 10TB but we still need to kee
taclustr>
>
> Read our latest technical blog posts here
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>
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> and Instaclustr Inc (USA).
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> This email and any attachments may contain confidential and legally
&g
Hi,
We are using Apache Cassandra 3.11.2 on RedHat 7
The data can grow to +100TB however the hot data will be in most cases less
than 10TB but we still need to keep the rest of data accessible.
Anyone has this problem?
What is the best way to make the cluster more efficient?
Is there a way to some
tax.com/
> en/cassandra/3.0/cassandra/dml/dmlHowDataWritten.html
>
> Dinesh
>
>
> On Thursday, February 15, 2018, 3:34:49 PM PST, Alaa Zubaidi (PDF) <
> alaa.zuba...@pdf.com> wrote:
>
>
> Is there any overhead if my keyspace contains many empty tables?
> Thanks
Is there any overhead if my keyspace contains many empty tables?
Thanks
Alaa
--
*This message may contain confidential and privileged information. If it
has been sent to you in error, please reply to advise the sender of the
error and then immediately permanently delete it and all attachments t
; case it might fail.
>
> C*heers,
> ---
> Alain Rodriguez - @arodream - al...@thelastpickle.com
> France / Spain
>
> The Last Pickle - Apache Cassandra Consulting
> http://www.thelastpickle.com
>
>
> 2018-01-26 20:49 GMT+00:00 Alaa Zubaidi (PDF) :
Hi,
What is the best way to migrate my Cassandra 2.x cluster from Windows to
Linux?
- Can I mix Windows and linux nodes in the same cluster? bring linux node
one by one, and shutdown windows nodes one by one?
- Can I use multiple racks feature? how would this work?
- Other ideas?
Regards.
Alaa
--
Hi,
I have a cluster of 8 Nodes, 4 physical machines 2 VMs each physical
machine.
RF=3, and we have read/write with QUORUM consistency requirement.
One of the machines needs to be down for an hour or two to fix local disk.
What is the best way to do that with out losing data?
Regards
-- Alaa
--
> host). YMMV but in the past Windows was somewhat of a neglected platform
>> wrt Cassandra. I think you'd have a lot easier time getting help if running
>> Linux is an option here.
>>
>>
>>
>> On Fri, Aug 12, 2016 at 9:16 AM, Alaa Zubaidi (PDF) > &g
rub, still persist, then offline sstablescrub still
> persist, wipe the node and it happen again, then i change the hardware
> (disk and mem). things went good.
>
> hth
>
> jason
>
>
> On Fri, Aug 12, 2016 at 9:20 AM, Alaa Zubaidi (PDF)
> wrote:
> > Hi,
> &g
]
Is it possible Cassandra is trying to compact the same file again while its
being compacted by another process?
Regards,
Alaa
On Thu, Aug 11, 2016 at 6:20 PM, Alaa Zubaidi (PDF)
wrote:
> Hi,
>
> I have a 16 Node cluster, Cassandra 2.2.1 on Windows, local installation
> (NOT on the cl
ted with
service-specific error Cannot create another system semaphore.
I could not find any thing regarding that error, all comments point to
application log.
Any help is appreciated..
--
Alaa Zubaidi
--
*This message may contain confidential and privileged information. If it
has been sen
/technotes/guides/management/agent.html
>
> The default config files for JMX authentication and access included in the
> JVM also have extensive details in the comments:
> $JAVA_HOME/jre/lib/management/jmxremote.access
> $JAVA_HOME/jre/lib/management/jmxremote.password.template
>
Hi,
I am trying to run nodetool remotely. but its not working:
I am running Cassandra 2.2.5 on CentOS 6.
listen_address: is set to
rpc_address: is set to 0.0.0.0
broadcast_rpc_address: is set to
I changed the following in cassadnra-env.sh
JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname="
-Dcom.s
.
Thanks,
On Wed, Oct 28, 2015 at 1:57 PM, Alaa Zubaidi (PDF)
wrote:
> Thanks Rob,
> We are using 7GB JVM on a 32GB RAM VM
> Alaa
>
> On Wed, Oct 28, 2015 at 11:18 AM, Robert Coli
> wrote:
>
>> On Tue, Oct 27, 2015 at 8:47 PM, Alaa Zubaidi (PDF) > > wrote:
>>
Thanks Rob,
We are using 7GB JVM on a 32GB RAM VM
Alaa
On Wed, Oct 28, 2015 at 11:18 AM, Robert Coli wrote:
> On Tue, Oct 27, 2015 at 8:47 PM, Alaa Zubaidi (PDF)
> wrote:
>
>> We have Cassandra 2.2.1 on Windows 2008R2-64-bit.
>>
>> We are noticing that during compac
Hi,
We have Cassandra 2.2.1 on Windows 2008R2-64-bit.
We are noticing that during compaction Cassandra consumes all the available
memory for the VM and bring the VM to a crawl. compaction settings are
default, and we are using sized tiered compaction.
When investigating this, we find through VMMA
It was a process installed by IT that triggered this, when disabling the
process everything went to normal.
Thanks.
Alaa
On Fri, Oct 16, 2015 at 11:32 AM, Alaa Zubaidi (PDF)
wrote:
> Thanks guys,
> I will look into this more, and put an update here, if I find anything
>
> On Fri,
able to at least link up the TID to the hex thread # in the
> jstack output to figure out who/what is spinning on there.
>
> On Fri, Oct 16, 2015 at 1:28 PM, Michael Shuler
> wrote:
>
>> On 10/16/2015 12:02 PM, Alaa Zubaidi (PDF) wrote:
>>
>>> No OOM in any
Thanks Rob,
No OOM in any of the log files, and NO long GC at that time.
I attached the last 2 minutes before it hangs until we restart cassandra
after hour an half.
Regards,
Alaa
On Thu, Oct 15, 2015 at 6:29 PM, Robert Coli wrote:
> On Thu, Oct 15, 2015 at 6:04 PM, Alaa Zubaidi (PDF)
>
Hi,
We are running Cassandra 2.2.1 on Windows 2008R2, and we see that multiple
Nodes are stuck at 100% CPU bringing the whole VM to a halt.
We suspect that there is another process that IT/Windows is causing the CPU
issue, but the problem is Cassandra does NOT recover, the CPU utilization
start cli
Hi,
We are running Cassandra 2.2.1 on Windows 2008R2, and we see that multiple
Nodes are stuck at 99% CPU bringing the whole VM to a halt.
We suspect that there is another process that IT/Windows is causing the CPU
issue, but the problem is Cassandra does NOT recover, the CPU utilization
start clim
Hi,
I testing Spark and Cassandra, Spark 1.4, Cassandra 2.1.7 cassandra spark
connector 1.4, running in standalone mode.
I am getting 4000 rows from Cassandra (4mb row), where the row keys are
random.
.. sc.cassandraTable[RES](keyspace,res_name).where(res_where).cache
I am expecting that it
f_v1, f_n2, f_v2, f_n3, f_v3)
>
> );
>
>
>
> And denormalize the data when you import to the table :
>
> One line in Oracle table with K filters become C(3, K) lines in C* table.
>
>
>
> Best regards,
>
> Minh
>
>
>
> *From:* Alaa Zubaidi (P
Hi,
I am trying to port an Oracle Table to Cassandra.
the table is a wide table (931 columns) and could have millions of rows.
name, filter1, filter2filter30, data1, data2...data900
The user would retrieve multiple rows from this table and filter (30 filter
columns) by one or more (up to 3)
Hi,
We are running an Old version of Cassandra 0.7.4 on Windows
At one point, the average read times is 2.1 seconds when SCOM (System
Center Operation Manager) is running, and 0.04 seconds when its disabled.
The problem is we CANNOT disable SCOM on these Windows VMs.
Any have seen this before? exp
Hi,
We have an 8 Node 1.0.10 Cassandra cluster with Replication of 3, running
on customer location, they all should be in the same DC, but we are NOT
100% sure.
We are having problem with the our own Cassandra client, the log file of
the client shows many "socket timeout" and "socket closed" errors
r will be more work)
>
> __
> Sent from iPhone
>
> On 6 Mar 2014, at 9:22 am, "Alaa Zubaidi (PDF)"
> wrote:
>
> Cassandra 1.0.10 with default settings..
>
>
> On Wed, Mar 5, 2014 at 4:57 PM, Robert Coli wrote:
>
>> On
Cassandra 1.0.10 with default settings..
On Wed, Mar 5, 2014 at 4:57 PM, Robert Coli wrote:
> On Wed, Mar 5, 2014 at 4:35 PM, Alaa Zubaidi (PDF)
> wrote:
>
>> I have a new 8 Node cluster, and when started loading data I see the
>> error below showing up a lot in 3 of the
Hi,
I have a new 8 Node cluster, and when started loading data I see the error
below showing up a lot in 3 of the 8 Nodes:
ERROR [Thrift:65] 2014-03-05 13:19:42,450 Cassandra.java (line 3041)
Internal error processing get_slice
java.lang.AssertionError
at
org.apache.cassandra.db.SliceFromReadComma
Hi,
Using 0.7.4, BOP, and RF=3, Write->QUORUM and Read->ONE "NO UPDATES"
How does get_range_slices using Key Range works? Is it possible to get
out of date list of keys?
If a key is inserted into 2 Nodes and after that a read with a key range
is issued, is it possible to have the 3 Node (that do
node tool ? If not what error ?
What about the cassandra CLI ?
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 25/08/2011, at 2:51 AM, Alaa Zubaidi wrote:
Hi Aaron,
I cannot at this point of time..
Thanks for your help..
Alaa
On 8/24
://www.thelastpickle.com
On 24/08/2011, at 12:16 PM, Alaa Zubaidi wrote:
Hi Aaron,
We are using Thrift 5..
TSocket _tr = new TSocket(server.Host, server.Port);//"localhost",
9160);
_transport = new TFramedTransport(_tr);
_protocol = new TBinaryProtocol(
) to check things work and then check you are using the
same thrift version.
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 18/08/2011, at 4:03 PM, Alaa Zubaidi wrote:
Hi Aaron,
Thanks for the reply.
I am running 0.7.4 and NO c
Developer
@aaronmorton
http://www.thelastpickle.com
On 18/08/2011, at 7:27 AM, Alaa Zubaidi wrote:
Hi,
I se this error while the application tries to connect to cassandra at the same
time from 2 different threads: any clues:
ERROR [pool-1-thread-13] 2011-07-29 06:46:45,718
I forgot to mention that we are on 0.7.4 now...
On 8/17/2011 12:31 PM, Alaa Zubaidi wrote:
Hi,
I se this error while the application tries to connect to cassandra at
the same time from 2 different threads: any clues:
ERROR [pool-1-thread-13] 2011-07-29 06:46:45,718
Hi,
I se this error while the application tries to connect to cassandra at
the same time from 2 different threads: any clues:
ERROR [pool-1-thread-13] 2011-07-29 06:46:45,718
CustomTThreadPoolServer.java (line 222) Error occurred during processing
of message.
java.lang.StringIndexOutOfBoundsExce
Hi,
I se this error while the application tries to connect to cassandra at
the same time from 2 different threads: any clues:
ERROR [pool-1-thread-13] 2011-07-29 06:46:45,718
CustomTThreadPoolServer.java (line 222) Error occurred during processing
of message.
java.lang.StringIndexOutOfBounds
itioner vs
RandomPartitioner<http://ria101.wordpress.com/2010/02/22/cassandra-randompartitioner-vs-orderpreservingpartitioner/>
.
--
Tyler Hobbs
Software Engineer, DataStax<http://datastax.com/>
Maintainer of the pycassa<http://github.com/pycassa/pycassa> Cassandra
Python client
lient behavior, yes. If that's an issue for you, make your
own UUIDs by appending something random or client-specific to the timestamp.
--
Alaa Zubaidi
PDF Solutions, Inc.
333 West San Carlos Street, Suite 700
San Jose, CA 95110 USA
Tel: 408-283-5639 (or 408-280-7900 x5639)
fax: 408-938-
Hi,
What is the best way to retrieve the latest rows from a CF with OPP.
We are using OPP and key range queries but I cannot find an easy way to
get the latest 10 keys for example from a column family with 1000s of keys.
I really don't want to create another CF to store row key names as
column
password. No
idea why that call would be hanging though.
On Thu, Nov 18, 2010 at 1:46 PM, Alaa Zubaidi wrote:
Hi Aaron,
Thanks for the help..
If I don't use the Authenticator, and keep it at AllowAll it will work
find..
I tried provide an invalid password but it behaved the same...
Here
password ?
Try using Hector ?
Try creating a new testing app from scratch.
Hope that helps
Aaron
On 18 Nov 2010, at 10:03, Alaa Zubaidi wrote:
One other thing, while login() hangs when called on the server side, and
nothing is logged, I see the following logged when I kill the hanged process.
D
One other thing, while login() hangs when called on the server side, and
nothing is logged, I see the following logged when I kill the hanged
process.
DEBUG 13:01:10,640 logged out: null
Thanks
On 11/17/2010 12:41 PM, Alaa Zubaidi wrote:
Hi Aaron,
I used the client, and was able to login
ged server side (with logging
at DEBUG).
Also, what client are you using ?
Aaron
On 16 Nov, 2010,at 02:02 PM, Alaa Zubaidi wrote:
> I removed the exception handling and It seems that the login() is hanging?
>
> On 11/15/2010 1:36 PM, Eric Evans wrote:
> > On Mon, 2010
I removed the exception handling and It seems that the login() is hanging?
On 11/15/2010 1:36 PM, Eric Evans wrote:
On Mon, 2010-11-15 at 12:26 -0800, Alaa Zubaidi wrote:
I set authority to SimpleAuthority and log4j.rootLogger=DEBUG,stdout,R
and its still the same, the error in my application
...
DEBUG .. batch_mutate
There is no mention to the login() and set_keyspace() methods.
and no other information..
Thanks for the help
On 11/15/2010 11:42 AM, Eric Evans wrote:
On Mon, 2010-11-15 at 11:30 -0800, Alaa Zubaidi wrote:
I tried both setting authority to
I tried both setting authority to
org.apache.cassandra.auth.SimpleAuthority and AllowAllAuthority...
I uncommitted the "Application logging options" in
log4j-server.properties, is this enough?
Thanks,
On 11/14/2010 8:10 AM, Eric Evans wrote:
On Fri, 2010-11-12 at 17:07 -0800, Al
No, the sever is not logging anything
On 11/13/2010 4:27 PM, Stu Hood wrote:
Is the server logging anything during the failed authentication?
On Fri, Nov 12, 2010 at 8:07 PM, Alaa Zubaidi wrote:
using SimpleAuthenticator is not working with me in beta 3
I am doing the following
ny thing
its giving me "I am not logged in" error.
Is there any thing I am missing?
Thanks,
--
Alaa Zubaidi
60
Welcome to cassandra CLI.
Type 'help' or '?' for help. Type 'quit' or 'exit' to quit.
Alaa
On 11/9/2010 8:30 AM, Jim Ancona wrote:
On Mon, Nov 8, 2010 at 8:31 PM, Alaa Zubaidi wrote:
Hi,
Failing to connect to cassandra client: on windows
[defa...@un
Hi,
Failing to connect to cassandra client: on windows
[defa...@unknown] connect localhost/9160
Exception connecting to localhost/9160. Reason: Connection refused: connect.
[defa...@unknown] connect xxx.xxx.x.xx/9160
Syntax error at position 0: no viable alternative at input 'connect'
[defa...@
te disk.
In either case, please do report back as it's interesting to figure
out what kind of performance issues people are seeing.
--
/ Peter Schuller
--
Alaa Zubaidi
PDF Solutions, Inc.
333 West San Carlos Street, Suite 700
San Jose, CA 95110 USA
Tel: 408-283-5639 (or 408-280-7900 x5639)
fax: 408-938-6479
email: alaa.zuba...@pdf.com
ut I suspect, since you're
doing time series data, that you're not storing very large values -
and I would expect compaction to be CPU bound rather than being close
to saturate disk.
In either case, please do report back as it's interesting to figure
out what kind of performance is
around 1800 col/sec per node, 3kb columns, reading is the same.
Data will be deleted after 4 hours.
On 11/3/2010 5:00 PM, Terje Marthinussen wrote:
How high is high and how much data do you have (Cassandra disk usage).
Regards,
Terje
On 4 Nov 2010, at 04:32, Alaa Zubaidi wrote:
Hi,
we
athan Shook
On Wed, Nov 3, 2010 at 2:32 PM, Alaa Zubaidi wrote:
Hi,
we have a continuous high throughput writes, read and delete, and we are
trying to find the best hardware.
Is using SSD for Cassandra improves performance? Did any one compare SSD
vs.
HDD? and any recommendations on SSDs?
Thanks
Hi,
we have a continuous high throughput writes, read and delete, and we are
trying to find the best hardware.
Is using SSD for Cassandra improves performance? Did any one compare SSD
vs. HDD? and any recommendations on SSDs?
Thanks,
Alaa
ross all cores.
--
Alaa Zubaidi
PDF Solutions, Inc.
333 West San Carlos Street, Suite 700
San Jose, CA 95110 USA
Tel: 408-283-5639 (or 408-280-7900 x5639)
fax: 408-938-6479
email: alaa.zuba...@pdf.com
--
Alaa Zubaidi
PDF Solutions, Inc.
333 West San Carlos Street, Suite 700
San Jose, CA 95110
Fri, Sep 24, 2010 at 3:03 PM, Alaa Zubaidi wrote:
Nothing is working, after disabling swap entirely, the heap is not
exhausted but Cassandra crashed with out of memory error.
I even slowed down the reading and writing, tried access mode=standard
nothing is working.
am I using Cassandra wrong or
ngle
sequential client doing the insertions? If you are maxing out without
being disk bound, make sure that in addition to spreading writes
across all nodes in the cluster, you are submitting writes with
sufficient concurrency to allow Cassandra to scale to use available
CPU across all cores.
--
A
Sorry 3 means QUORUM.
On 9/27/2010 2:55 PM, Benjamin Black wrote:
On Mon, Sep 27, 2010 at 2:51 PM, Benjamin Black wrote:
On Mon, Sep 27, 2010 at 12:59 PM, Alaa Zubaidi wrote:
Thanks for the help.
we have 2 drives using basic configurations, commitlog on one drive and data
on another.
and
t there is no legitimate significant stack
depth).
I'm not sure what the best course of action is here short of going
down the path of trying to investigate the problem at the JVM level.
I'm hoping someone will come along and point to a simple explanation
that we're missing :)
n Fri, Sep 24, 2010 at 3:03 PM, Alaa Zubaidi wrote:
Nothing is working, after disabling swap entirely, the heap is not
exhausted but Cassandra crashed with out of memory error.
I even slowed down the reading and writing, tried access mode=standard
nothing is working.
am I using Cassandra wrong or
onds has passed. You need to trigger the compaction using node tool.
http://wiki.apache.org/cassandra/DistributedDeletes
Aaron
On 23 Sep 2010, at 12:14, Alaa Zubaidi wrote:
Hi,
I am expecting my data size to be around nGB. However, it keeps growing and
growing.
I am setting the gc_grace_seco
and will be "removed" after
gc_grace_seonds, and I was told that the if ALL columns are deleted the
whole row will be deleted as well? is this true or not?
Thanks,
Alaa Zubaidi
PDF Solutions, Inc.
333 West San Carlos Street, Suite 700
San Jose, CA 95110 USA
Tel: 408-283-5639 (or 40
ng to draw conclusions about performance. And you don't want those
exceptions in your logs.
--
Alaa Zubaidi
PDF Solutions, Inc.
333 West San Carlos Street, Suite 700
San Jose, CA 95110 USA
Tel: 408-283-5639 (or 408-280-7900 x5639)
fax: 408-938-6479
email: alaa.zuba...@pdf.com
t;\" in the file location.
Alaa
On 9/7/2010 11:43 PM, Viktor Jevdokimov wrote:
We found that on Windows only log4j.properties is working for logging, not
log4-server.properties
-----Original Message-
From: Alaa Zubaidi [mailto:alaa.zuba...@pdf.com]
Sent: Wednesday, Septe
sions on the directory, check the root logger is configured to use
the rolling file appender (e.g. log4j.rootLogger=INFO,R )
Aaron
On 08 Sep, 2010,at 03:42 PM, Alaa Zubaidi wrote:
> I modified the log4-server.properties:
>
> /# Edit the next line to point to your
.e. is you
logging configured to use
> E:\var\log\cassandra\Cass07\system.log
When you say cassandra created /var/log/cassandra/system.log i'ts a bit
confusing, what drive are you talking about ?
Aaron
On 08 Sep, 2010,at 01:22 PM, Alaa Zubaidi wrote:
> Thanks Aaron,
>
> For som
, and also logs to the file and stdout
by default.
Aaron
On 08 Sep, 2010,at 12:44 PM, Alaa Zubaidi wrote:
> Hi,
> I are testing 0.7 and I cannot find the system.log file, is there any
> thing I need to do in order to enable the logging?
> I read about the changes made to the l
Hi,
I are testing 0.7 and I cannot find the system.log file, is there any
thing I need to do in order to enable the logging?
I read about the changes made to the logging in 0.7 but did not find any
thing that needs to be done to enable the logging..
Regards,
Alaa
framed by default; 0.6 did not.
--
Alaa Zubaidi
PDF Solutions, Inc.
333 West San Carlos Street, Suite 700
San Jose, CA 95110 USA
Tel: 408-283-5639 (or 408-280-7900 x5639)
fax: 408-938-6479
email: alaa.zuba...@pdf.com
424)
at
rtsim.CassandraInterface.ConnectToKeyspace(CassandraInterface.java:216)
at rtsim.Main.main(Main.java:308)
Note: I get the following when I start Cassandra:
*10/08/19 12:58:26 INFO utils.Mx4jTool: Will not load MX4J,
mx4j-tools.jar is not in the classpath*
--
Alaa Zubaidi
/cassandra/conf/passwd.properties"
Now I will test it on windows ;)
Regards,
Maciek
--
Alaa Zubaidi
PDF Solutions, Inc.
333 West San Carlos Street, Suite 700
San Jose, CA 95110 USA
Tel: 408-283-5639 (or 408-280-7900 x5639)
fax: 408-938-6479
email: alaa.zuba...@pdf.com
Cassandra documentation on setting up a cluster implies you should
not use 127.0.0.1, but that may not be the issue.
*From:* Alaa Zubaidi [mailto:alaa.zuba...@pdf.com]
*Sent:* Friday, July 23, 2010 11:37 AM
*To:* user
Jonathan Ellis wrote:
I know on a mac you need to explicitly create an alias for 127.0.0.2
before it can be used. Maybe something similar applies to Windows.
On Fri, Jul 23, 2010 at 11:36 AM, Alaa Zubaidi wrote:
Hi,
I am new to Cassandra, and I want to create a 2 node cluster on the SAME
Any insight is much appreciated..
Alaa Zubaidi wrote:
Hi,
I am new to Cassandra, and I want to create a 2 node cluster on the
SAME machine running windows for testing my application before we get
new hardware.
I am facing "No other nodes seen! Unable to bootstrap"
The first n
emon.jav
a:115)
at
org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java
:211)
--
Alaa Zubaidi
PDF Solutions, Inc.
333 West San Carlos Street, Suite 700
San Jose, CA 95110 USA
Tel: 408-283-5639 (or 408-280-7900 x5639)
fax: 408-938-6479
email: alaa.zuba...@pdf.com
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