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
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&g
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
>
>
> -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
Hi,
I have a 16 Node cluster, Cassandra 2.2.1 on Windows, local installation
(NOT on the cloud)
and I am getting
Error [CompactionExecutor:2] 2016-08-12 06:51:52, 983 Cassandra
Daemon.java:183 - Execption in thread Thread[CompactionExecutor:2,1main]
org.apache.cassandra.io.FSReaderError:
org.apac
]
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
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
> 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
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
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,
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
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)
>
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
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,
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
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
.
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:
>>
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
/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 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
--
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
--
; 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) :
Is there any overhead if my keyspace contains many empty tables?
Thanks
Alaa
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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
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,
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)
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 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
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
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
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
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