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I am running cassandra in a single node and have 1million + rows.
Thank You!
On Fri, Dec 12, 2014 at 2:57 AM, Ryan Svihla rsvi...@datastax.com wrote:
An estimated partition key count can be had from nodetool cfstats,
however for large data sets analytics style queries (such as verification
mutations, you will hit that threshold.
In addition, Patrick is saying that he does not recommend more than 100
mutations per batch. So why not warn users just on the # of mutations in a
batch?
Mohammed
*From:* Ryan Svihla [mailto:rsvi...@datastax.com]
*Sent:* Thursday, December 11, 2014 12
11, 2014 at 9:56 PM, Ryan Svihla rsvi...@datastax.com wrote:
Nothing magic, just put in there based on experience. You can find the
story behind the original recommendation here
https://issues.apache.org/jira/browse/CASSANDRA-6487
Key reasoning for the desire comes from Patrick McFadden
effect?
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Clarification keyspace for each should be keyspace for cassandra tables
and solr tables
On Fri, Dec 12, 2014 at 11:25 AM, Ryan Svihla rsvi...@datastax.com wrote:
It would make more sense to just have a keyspace for each. Something like
solr_tables, and cassandra_tables. I've done similar
gotchas we should be concerned about? Our total table
count is small, in the tens range; our searchable tables are maybe 4 or 5.
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(which is fire walled)
On Fri, Dec 12, 2014 at 5:19 AM, Ryan Svihla rsvi...@datastax.com wrote:
yes the node needs to restart to have cassandra-env.sh take effect, and
the links you're providing are about making cassandra's JMX bind to the
interface you want, so nodetool isn't really the issue
, Ryan Svihla rsvi...@datastax.com wrote:
is appears to be localhost, I imagine the issue is more you changed the
rpc_address to not be localhost anymore
https://github.com/apache/cassandra/blob/cassandra-2.0/src/java/org/apache/cassandra/tools/NodeCmd.java
lines 87 and 88
private static
, {sa_family=AF_INET6, sin6_port=htons(7199),
inet_pton(AF_INET6, :::173.x.x.x, sin6_addr), sin6_flowinfo=0,
sin6_scope_id=0}, 28 unfinished ...
On Fri, Dec 12, 2014 at 12:20 PM, Ryan Svihla rsvi...@datastax.com
wrote:
is appears to be localhost, I imagine the issue is more you changed
?
Mohammed
*From:* Ryan Svihla [mailto:rsvi...@datastax.com]
*Sent:* Thursday, December 11, 2014 12:56 PM
*To:* user@cassandra.apache.org
*Subject:* Re: batch_size_warn_threshold_in_kb
Nothing magic, just put in there based on experience. You can find the
story behind the original
, always good to push back on
theory discussions with numbers.
On Sat, Dec 13, 2014 at 8:12 AM, Ryan Svihla rsvi...@datastax.com wrote:
Are batches to the same partition key (which results in a single mutation,
and obviously eliminates the primary problem)? Is your client network
and/or CPU bound
:* Jonathan Haddad j...@jonhaddad.com
*Sent:* Friday, December 12, 2014 12:58 PM
*To:* user@cassandra.apache.org ; Ryan Svihla rsvi...@datastax.com
*Subject:* Re: batch_size_warn_threshold_in_kb
The really important thing to really take away from Ryan's original post
is that batches
and Engineering,
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DataStax is the fastest, most scalable
utility?
3. Is is necessary to run repair weekly?
thanks
regards
Neha
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DataStax
, Dec 16, 2014 at 10:32 PM, Ryan Svihla rsvi...@datastax.com
wrote:
CL quorum with RF2 is equivalent to ALL, writes will require
acknowledgement from both nodes, and reads will be from both nodes.
CL one will write to both replicas, but return success as soon as the
first one responds, read
) If I want to search on a column, it has to be part of the primary key
3) If a column is part of the primary key, it cannot be edited so I have a
circular dependency
Thanks,
Jason
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using the backup? Do I have to have the
tokens range backed up as well?
-Pranay
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*From:* Ryan Svihla rsvi...@datastax.com
*To:* user@cassandra.apache.org
*Sent:* Tuesday, December 16, 2014 12:36 PM
*Subject:* Re: Comprehensive documentation on Cassandra Data modelling
Data Modeling a distributed application could be a book unto itself
/
Ryan Svihla
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DataStax is the fastest, most scalable distributed database technology,
delivering Apache Cassandra to the world’s most innovative enterprises
better on performance tuning
would be appreciated.
arne
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DataStax is the fastest
that
nice CPU further down.
No TombstoneOverflowingExceptions.
On Tue, Dec 16, 2014 at 11:50 AM, Ryan Svihla rsvi...@datastax.com
wrote:
What's CPU, RAM, Storage layer, and data density per node? Exact heap
settings would be nice. In the logs look for TombstoneOverflowingException
also based on replayed batches..are you using batches to load data?
On Tue, Dec 16, 2014 at 3:12 PM, Ryan Svihla rsvi...@datastax.com wrote:
So heap of that size without some tuning will create a number of problems
(high cpu usage one of them), I suggest either 8GB heap and 400mb parnew
pegged at load 4 for the over 12 hours with
hardly and read or write traffic. I will set one to 8GB/400MB and see if
its load changes.
On Tue, Dec 16, 2014 at 1:12 PM, Ryan Svihla rsvi...@datastax.com wrote:
So heap of that size without some tuning will create a number of problems
(high cpu usage
of
tombstones in a row?
thanks,
arne
On Tue, Dec 16, 2014 at 1:24 PM, Ryan Svihla rsvi...@datastax.com wrote:
So 1024 is still a good 2.5 times what I'm suggesting, 6GB is hardly
enough to run Cassandra well in, especially if you're going full bore on
loads. However, you maybe just flat out
.
On Tue, Dec 16, 2014 at 1:47 PM, Ryan Svihla rsvi...@datastax.com wrote:
Can you define what is virtual no traffic sorry to be repetitive about
that, but I've worked on a lot of clusters in the past year and people have
wildly different ideas what that means.
unlogged batches of the same partition
18
Compaction seems like the only thing consistently active and pending
On Tue, Dec 16, 2014 at 2:18 PM, Ryan Svihla rsvi...@datastax.com wrote:
Ok based on those numbers I have a theory..
can you show me nodetool tptats for all 3 nodes?
On Tue, Dec 16, 2014 at 4:04 PM
, DELETE by partition key,
insert all rows for partition key, repeat.
We two tables that have similar frame data projections and some other
aggregates with much smaller row count per partition key.
hope that helps,
arne
On Dec 16, 2014, at 2:46 PM, Ryan Svihla rsvi...@datastax.com wrote:
so
the cluster
is idle? Is it compaction catching up and would manual forced compaction
alleviate that?
thanks,
arne
On Dec 16, 2014, at 3:28 PM, Ryan Svihla rsvi...@datastax.com wrote:
so a delete is really another write for gc_grace_seconds (default 10
days), if you get enough tombstones it can
claim that there are any
tombstones.
On Dec 16, 2014, at 4:26 PM, Ryan Svihla rsvi...@datastax.com wrote:
manual forced compactions create more problems than they solve, if you
have no evidence of tombstones in your selects (which seems odd, can you
share some of the tracing output?), then I'm
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DataStax is the fastest, most scalable distributed database technology,
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%
reads). We are planning to use Spark as the in memory computation engine.
Thanks
Ajay
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to avoid putting the cart infront of the horse. Picking a tool before
you have a clear understanding of the problem is a good recipe for disaster
On Thu, Dec 18, 2014 at 8:04 AM, Ryan Svihla rsvi...@datastax.com wrote:
Since Ajay is already using spark the Spark Cassandra Connector really
gets
processing is the same.
On Thu, Dec 18, 2014 at 8:18 AM, Ryan Svihla rsvi...@datastax.com wrote:
I'll decline to continue the commentary on spark, as again this probably
belongs on another list, other than to say, microbatches is an intentional
design tradeoff that has notable benefits
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DataStax is the fastest, most scalable distributed database technology,
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exist but I am not aware of it.
Any other important information or advice you can give me about best
practices or tricks while running a multi DC (cross regions US - EU) is
welcome of course !
cheers,
Alain
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and potentially reads, the tools are
there.
C*heers
Alain
2014-12-19 15:43 GMT+01:00 Ryan Svihla rsvi...@datastax.com:
More accurately,the write path of Cassandra in a multi dc sense is kinda
like the following
1. write goes to a node which acts as coordinator
2. writes go out to all
:
Hello all,
I just read that the default size of the Key cache is 100 MB. Is it stored
in memory or disk?
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wide deployment in the
install process already?
B.
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DataStax is the fastest, most
would take to
rebuild a 250G data node?
Thanks in advance,
Or.
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You can cheat it by using the non counter column as part of your primary
key (clustering column specifically) but the cases where this could work
are limited and the places this is a good idea are even more rare.
As for using counters in batches are already a not well regarded concept
and counter
are operating at a scale where you need to be
able to automate adding new nodes.
On Sun, Dec 21, 2014, 8:05 AM Ryan Svihla rsvi...@datastax.com wrote:
Puppet, Chef, Ansible and I'm sure many others. I've personally worked
with a number of people on all three, a quick google for Puppet Cassandra
information Ryan, I hope I am clear enough
while expressing my doubts.
C*heers
Alain
2014-12-19 15:43 GMT+01:00 Ryan Svihla rsvi...@datastax.com:
More accurately,the write path of Cassandra in a multi dc sense is
kinda like the following
1. write goes to a node which acts as coordinator
2. writes
There can be many root causes. Would need a lot more information such as
node hardware specs, cf histograms on the table, tpstats,GC settings (Max
heap, parnew, JVM version) and logs with specifically any ERROR, WARN, or
GCInspector messages
As a start a simple trace of the query in question is
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realize it applied in my case.
Thanks.
On Mon, Dec 22, 2014 at 4:43 PM, Ryan Svihla rsvi...@datastax.com
wrote:
what is rpc_address set to in cassandra.yaml? my gut is localhost, set
it to the interface that communicates between host and guest.
On Mon, Dec 22, 2014 at 3:38 PM, Kai Wang dep
if this helps..what did you change rpc_address to?
On Mon, Dec 22, 2014 at 8:15 PM, Ryan Svihla rsvi...@datastax.com wrote:
right that's localhost, you have to change it to match the ip of whatever
you changed rpc_address too
On Mon, Dec 22, 2014 at 8:07 PM, Kai Wang dep...@gmail.com wrote
connect 127.0.0.1:9042.
On Mon, Dec 22, 2014 at 9:01 PM, Ryan Svihla rsvi...@datastax.com wrote:
totally depends on how the implementation is handled in virtualbox, I'm
assuming you're connecting to an IP that makes sense on the guest (ie
nodetool -h 192.168.1.100 and cqlsh 192.168.1.100, replace
but not both. So I didn't set rpc_addresa. Will double check
tomorrow. Thanks.
On Dec 22, 2014 9:17 PM, Ryan Svihla rsvi...@datastax.com wrote:
if this helps..what did you change rpc_address to?
On Mon, Dec 22, 2014 at 8:15 PM, Ryan Svihla rsvi...@datastax.com
wrote:
right that's localhost
) I don't need a 100% accurate count
and strong consistency. Performance and application complexity is my main
concern.
Thanks
On Mon, Dec 22, 2014 at 10:37 PM, Ryan Svihla rsvi...@datastax.com
wrote:
You can cheat it by using the non counter column as part of your primary
key (clustering
for different query paths and solr. If I switch to Spark,
do I still needs to use counter or counting will be done by spark on
regular table?
On Tue, Dec 23, 2014 at 11:31 AM, Ryan Svihla rsvi...@datastax.com
wrote:
increment wouldn't be idempotent from the client unless you knew the
count
Don't static columns get you what you want?
http://www.datastax.com/documentation/cql/3.1/cql/cql_reference/refStaticCol.html
On Dec 22, 2014 10:50 PM, David Broyles sj.clim...@gmail.com wrote:
Although I used Cassandra 1.0.X extensively, I'm new to CQL3. Pages such
as
I think that'd be slow copying large files with just the cp command.
Cassandra isn't doing anything amazingly strange here, you don't have a lot
of RAM, nor CPU and I'm assuming the underlying disk is slow here as well.
Without more parameters and details it's hard to define if there is an
issue.
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an
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if there
is other way to make it faster except adding CPUs and ram.
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2014-12-24 20:40 GMT+08:00 Ryan Svihla
again!
On Mon, Dec 22, 2014 at 9:50 PM, Ryan Svihla rsvi...@datastax.com wrote:
Don't static columns get you what you want?
http://www.datastax.com/documentation/cql/3.1/cql/cql_reference/refStaticCol.html
On Dec 22, 2014 10:50 PM, David Broyles sj.clim...@gmail.com wrote:
Although I used
/total_events (although with potentially many other pieces
of static information).
More generally, do you find that tuned applications tend to use Thrift, a
combination of Thrift and CQL3, or is CQL3 really expected to replace
Thrift?
Thanks again!
On Mon, Dec 22, 2014 at 9:50 PM, Ryan Svihla rsvi
and this node only
afford new data?
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Ryan Svihla
with cassandra??
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, Ryan Svihla r...@foundev.pro wrote:
as long as they know how to handle node recovery and don't inflict return
data back from the dead that was deleted.
On Tue, Jan 6, 2015 at 12:52 PM, Robert Coli rc...@eventbrite.com wrote:
On Tue, Jan 6, 2015 at 7:39 AM, Ryan Svihla r...@foundev.pro wrote
) by
deleting and inserting as a new row. This is not something we would do on a
regular basis, but after or during the process a compact would greatly help
to clear out tombstones/rewritten data.
@Ryan Svihla it also sounds like your suggestion in this case would be:
create a new column family
as long as they know how to handle node recovery and don't inflict return
data back from the dead that was deleted.
On Tue, Jan 6, 2015 at 12:52 PM, Robert Coli rc...@eventbrite.com wrote:
On Tue, Jan 6, 2015 at 7:39 AM, Ryan Svihla r...@foundev.pro wrote:
In general today, large amounts
, but there is few network traffic on my new data center nodes.
I want to konw _how could I konw when the rebuild finsh_.
Thanks all for your reply.
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log.
SliceQueryFilter.java (line 225) Read 6 live and 2688 tombstoned cells in
ks.mytable (see tombstone_warn_threshold). 10 columns was requested,
slices=[-], delInfo={deletedAt=-9223372036854775808, localDeletion=
2147483647}
Thanks,
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quickly, having thousands of
record updates per second. That left us with a CF containing millions of
records that we couldn't select the way we originally intended.
Regards,
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are this way. Inserts are actually UPSERTS and you can
go ahead and do two updates instead of insert, delete, update.
Thanks.
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of hints. I
personally run with at least a 6 hour max_h_w_i_m.
In older versions of Cassandra, 24-48 hours of hints could hose your node
via ineffective constant compaction.
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.
Does anybody have insights as to what could be happening? Thanks.
Mohammed
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and update use the client side
timestamp.
The update timestamp should be always bigger than the deletion timestamp.
I wonder why the update failed in some cases?
thank you.
- 原始邮件 -
发件人：Ryan Svihla r...@foundev.pro
收件人：user@cassandra.apache.org, yhq...@sina.com
主题：Re
Just noticed you'd sent this to the dev list, this is a question for only
the user list, and please do not send questions of this type to the
developer list.
On Thu, Jan 8, 2015 at 8:33 AM, Ryan Svihla r...@foundev.pro wrote:
The nature of replication factor is such that writes will go wherever
address.
However, I found my jobs were connecting to the REST service data center.
How can I specify the data center?
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to explore.
Materialized views are your friend, use them freely but as always being
mindful of real world constraints and goals.
Regards,
Nageswara Rao
On Tue, Jan 6, 2015 at 10:53 PM, Ryan Svihla r...@foundev.pro wrote:
Normal data modeling approach in Cassandra is a separate column family
view does a Cassandra Trigger impacts the performance
of read/Write of Cassandra.
Also any other way you guys achieve this please guide me. I am struck
on this .
Regards
Asit
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a super
column family which has the key PRIMARY KEY((prodgroup), staus,
productid) should work. Would like to get expert advice on other
alternatives.
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this.
On Tuesday, January 6, 2015, Ryan Svihla r...@foundev.pro wrote:
Btw side note here, you're using GIANT Batches, and the logs are
indicating such, this will cause a signficant amount of heap pressure.
The root cause fix is not to use giant batches in the first place.
On Tue, Jan 6, 2015 at 4:43 AM
when I get a query which I had not
thought off?
Regards,
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.
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here, though I'm not
sure if that's just FUD talking...
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that if you are operating near failure, repair might trip a node
into failure. But if you are operating correctly, repair should not.
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t from 12 seconds to 30 seconds.
>>>
>>> 2)
>>> Increasing driver-connect-timeout from 5 seconds to 30 seconds.
>>>
>>> 3)
>>> I have also confirmed that each of the 4 nodes are telnet-able over
>>> ports 9042 and 9160 each.
>>>
>>>
>>> Definitely seems to be some driver-issue, since
>>> data-persistence/replication works perfect (with any permutation) if
>>> data-persistence is done via "cqlsh".
>>>
>>>
>>> Kindly provide some pointers.
>>> Ultimately, it is the Java-driver that will be used in production, so it
>>> is imperative that data-persistence/replication happens for any downing of
>>> any permutation of node(s).
>>>
>>>
>>> Thanks and Regards,
>>> Ajay
>>>
>>
>>
>>
>> --
>> Regards,
>> Ajay
>>
>
>
>
> --
> Regards,
> Ajay
>
--
Thanks,
Ryan Svihla
re 1000's of files it become a big maintenance
> issue
>
> @UDT (keyspace = "complex", name = "address")public class Address {
> private String street;
> private String city;
> private int zipCode;
>
>
--
Thanks,
Ryan Svihla
on the filtered dataset.
- Ryan Svihla
On Sat, Oct 17, 2015 at 7:12 PM -0700, "Jack Krupansky"
<jack.krupan...@gmail.com> wrote:
Yes, you can have all your normal data centers with DSE configured for
real-time data access and then have a data center that shares the same d
Not a Cassandra question so this isn't the right list, but you can just upload
the file to CFS and then access it by the path "cfs://filename".
However, since you have DSE you may want to contact support for help with
pathing in DSE using CFS and Spark.
-Ryan Svihla
On Fri, Oct 16,
;>> at QUORUM is important. If read is ONE then the read operation *may*
>>>> not see important update. The safest option is QUORUM for both write and
>>>> read. Then depending on the business or feature the consistency may be
>>>> tuned.
>>>>
>>>> — Brice
>>>>
>>>>
>>>
>>>
>>>
>>> --
>>> Steve Robenalt
>>> Software Architect
>>> sroben...@highwire.org <bza...@highwire.org>
>>> (office/cell): 916-505-1785
>>>
>>> HighWire Press, Inc.
>>> 425 Broadway St, Redwood City, CA 94063
>>> www.highwire.org
>>>
>>> Technology for Scholarly Communication
>>>
>>>
>>
>>
>> --
>> Steve Robenalt
>> Software Architect
>> sroben...@highwire.org <bza...@highwire.org>
>> (office/cell): 916-505-1785
>>
>> HighWire Press, Inc.
>> 425 Broadway St, Redwood City, CA 94063
>> www.highwire.org
>>
>> Technology for Scholarly Communication
>>
>>
--
Thanks,
Ryan Svihla
echnology.
On Mon, Sep 7, 2015 at 6:20 AM, ibrahim El-sanosi <ibrahimsaba...@gmail.com>
wrote:
> ""It you need strong consistency and don't mind lower transaction rate,
> you're better off with base""
> I wish you can explain more how this statment relate to the my post?
> Regards,
>
--
Thanks,
Ryan Svihla
4. Solution 2: *
>25.
>26. 1) Create a map table for every possible join.
>27.
>28. Drawbacks with this aproach:
>29.
>30. I think, this is not a right approach. So join to table (map
>table) mapping idea is not right.
>31.
>32. pastebin link for the same: http://pastebin.com/FRAyihPT
>33. Please suggest me on this.
>
>
>
>
--
Thanks,
Ryan Svihla
currently have a Cassandra Cluster spread over 2 DC. The data size on
>>> each node of the cluster is 1.2TB with spinning disk. Minor and Major
>>> compactions are slowing down our Read queries. It has been suggested that
>>> replacing Spinning disks with SSD might help. Has anybody done something
>>> similar? If so what has been the results?
>>> Also if we go with SSD, how big can each node get for commercially
>>> available SSDs?
>>> Regards
>>> Sachin
>>>
>>
>>
> --
Regards,
Ryan Svihla
Rack
>> UN 40.0.0.208 128.73 KB 248 68.8%
>> 6e7788f9-56bf-4314-a23a-3bf1642d0606 RAC1
>> UN 40.0.0.209 114.59 KB 249 67.8%
>> 84f6f0be-6633-4c36-b341-b968ff91a58f RAC1
>> UN 40.0.0.205 129.53 KB 245 63.5%
>> aa233dc2-a8ae-4c00-af74-0a119825237f RAC1
>>
>> the result of the query select * from service_dictionary.table1; gave me
>> 70 rows from 40.0.0.205
>> 64 from 40.0.0.209
>> 54 from 40.0.0.208
>>
>> 2015-09-07 11:13 GMT+02:00 Edouard COLE <edouard.c...@rgsystem.com>:
>> Could you provide the result of :
>> - nodetool status
>> - nodetool status YOURKEYSPACE
>>
>>
>>
> --
Regards,
Ryan Svihla
at LOCAL_* quorum levels, I do not believe those queries should be
>>> routed to the new dc.
>>>
>>
>> Other than CASSANDRA-9753, this is true.
>>
>> https://issues.apache.org/jira/browse/CASSANDRA-9753 (Unresolved; ):
>> "LOCAL_QUORUM reads can block cross-DC if there is a digest mismatch"
>>
>> =Rob
>>
>>
> --
Regards,
Ryan Svihla
f while writing the data.
>
>
> Please let me know if a better solution is available. I am using 2.1.5
> version.
>
> Regards,
> Sam
>
--
Thanks,
Ryan Svihla
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