Re: [EXTERNAL] Re: cold vs hot data

y > > > > -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

Re: cold vs hot data

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

Re: cold vs hot data

taclustr> > > Read our latest technical blog posts here > <https://www.instaclustr.com/blog/>. > > This email has been sent on behalf of Instaclustr Pty. Limited (Australia) > and Instaclustr Inc (USA). > > This email and any attachments may contain confidential and legally &g

cold vs hot data

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

Re: overhead of empty tables

gt; 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 > Alaa

overhead of empty tables

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

Re: Migrate from Windows to Linux

this specific > 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+0

Migrate from Windows to Linux

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

Bring 2 nodes down

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 --

Re: Corrupt SSTABLE over and over

t Windows? (Trying to make sure its not just the >> 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, Au

Re: Corrupt SSTABLE over and over

irst i > try nodetool scrub, 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) > &l

Re: Corrupt SSTABLE over and over

] 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) <alaa.zuba...@pdf.com> wrote: > Hi, > > I have a 16 Node cluster, Cassandra 2.2.1 on Windows, loc

Corrupt SSTABLE over and over

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:

Re: nodetool -h fails Connection refused

te.password.template > > > > On Tue, Apr 19, 2016 at 8:40 PM, Alaa Zubaidi (PDF) <alaa.zuba...@pdf.com> > wrote: > >> Hi, >> >> I am trying to run nodetool remotely. but its not working: >> I am running Cassandra 2.2.5 on CentOS 6. >> listen_addres

nodetool -h fails Connection refused

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="

Re: Cassandra 2.2.1 on Windows (disk_access_mode: mmap_index_only)

. Thanks, On Wed, Oct 28, 2015 at 1:57 PM, Alaa Zubaidi (PDF) <alaa.zuba...@pdf.com> 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 <rc...@eventbrite.com> > wrote: > >> On Tue, Oct 27, 2015 at

Re: Cassandra 2.2.1 on Windows

Thanks Rob, We are using 7GB JVM on a 32GB RAM VM Alaa On Wed, Oct 28, 2015 at 11:18 AM, Robert Coli <rc...@eventbrite.com> wrote: > On Tue, Oct 27, 2015 at 8:47 PM, Alaa Zubaidi (PDF) <alaa.zuba...@pdf.com> > wrote: > >> We have Cassandra 2.2.1 on Windows 2008R2-64

Re: Cassandra 2.2.1 stuck at 100% on Windows

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) <alaa.zuba...@pdf.com> wrote: > Thanks guys, > I will look into this more, and put an update here, if I f

Cassandra 2.2.1 on Windows

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

Re: Cassandra 2.2.1 stuck at 100% on Windows

> > We should be 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 <mich...@pbandjelly.org> > wrote: > >> On 10/16/2015 12:02 PM, Alaa Zu

Re: Cassandra 2.2.1 stuck at 100% on Windows

esult of GC failure and/or OOM. > > Check your logs for OOM and long GCs. > > Also FWIW you are among a relatively small group of Windows operators. > Other than with the people working at datastax to support Windows, there is > not a whole lot of well understood operational bes

Cassandra 2.2.1 stuck at 100% on Windows

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

Cassandra 2.2.1 stuck at 100% on Windows

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

Spark partitions from CassandraRDD

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

Re: CQL Data Model question

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 (PDF) [mailto:alaa.zuba...@pdf.com] *Sent:* lundi 11 mai 2015 20:32 *To:* user@cassandra.apache.org *Subject:* CQL Data Model question Hi

CQL Data Model question

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)

Cassandra on Window with SCOM running

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?

Cassandra Caused by: UnavailableException()

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,

Cassandra Internal error processing get_slice java.lang.AssertionError

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

Re: Cassandra Internal error processing get_slice java.lang.AssertionError

Cassandra 1.0.10 with default settings.. On Wed, Mar 5, 2014 at 4:57 PM, Robert Coli rc...@eventbrite.com wrote: On Wed, Mar 5, 2014 at 4:35 PM, Alaa Zubaidi (PDF) alaa.zuba...@pdf.comwrote: I have a new 8 Node cluster, and when started loading data I see the error below showing up a lot