the exception trace class names indicates
that the error is detected in the Java driver, not Cassandra.
-- Jack Krupansky
On Thu, May 5, 2016 at 6:45 PM, horschi wrote:
> Hi Jack,
>
> I thought that it is Cassandra that fills the value on CAS failures. So
> the question if it is to
Probably better to ask this on the Java driver user list.
-- Jack Krupansky
On Wed, May 4, 2016 at 11:46 AM, horschi wrote:
> Hi,
>
> I am doing some testing on CAS operations and I am frequently having the
> issue that my resultset says wasApplied()==false, but it does not c
Just following up... Oleg, have you gotten a satisfactory level of feedback
from the community on the security assessment issues?
And if there is any sort of final assessment that can be publicly accessed,
that would be great.
-- Jack Krupansky
On Thu, Feb 11, 2016 at 3:29 PM, oleg yusim wrote
for cqlsh?
-- Jack Krupansky
On Tue, Apr 19, 2016 at 4:56 PM, Jack Krupansky
wrote:
> Sylvain & Tyler, this Jira is for a user reporting a timeout for SELECT
> COUNT(*) using 3.3:
> https://issues.apache.org/jira/browse/CASSANDRA-11566
>
> I'll let one of you guys foll
ng should
make that not a problem. Or is there a timeout in cqlsh simply because the
operation is slow - as opposed to the server reporting an internal timeout?
Thanks.
-- Jack Krupansky
On Tue, Apr 19, 2016 at 12:45 PM, Tyler Hobbs wrote:
>
> On Tue, Apr 19, 2016 at 11:32 AM, Jack Kru
be treated more as a batch-style OLAP operation rather than a
real-time OLTP operation... I think.
Thanks.
-- Jack Krupansky
On Tue, Apr 19, 2016 at 12:04 PM, Tyler Hobbs wrote:
>
> On Tue, Apr 19, 2016 at 9:51 AM, Jack Krupansky
> wrote:
>
>>
>> 1. Another clarification
proportional to the
number of rows on all nodes? I mean, you can't dedupe using only partition
keys of the coordinator node, right? What I'm wondering is if the usability
of COUNT (et al) is memory limited as well as time.
Thanks.
-- Jack Krupansky
On Tue, Apr 19, 2016 at 5:36 AM, Sylvain Lebre
?
A companion question is whether COUNT(column_name) has the same limitations
and recommendations. It does have to actually fetch the column values as
opposed to simply determining the existence of the row, but how
consequential that additional processing is, I couldn't say.
-- Jack Krupansky
data or state is relatively inconsequential. How that model applies to a
database server that works best with fairly large amounts of ultra-fast
local data storage is not so obvious. Maybe that simply wasn't a design
goal?
-- Jack Krupansky
On Fri, Apr 15, 2016 at 3:48 PM, David Aronchick
keep your chosen release
in production for longer than the older 3.0 releases will be in production.
Ultimately, this is a personality test: Are you adventuresome or
conservative?
To be clear, with the new tick-tock release scheme, 3.5 is designed to be a
stable release.
-- Jack Krupansky
On Thu
uring times
of stress.
-- Jack Krupansky
On Thu, Apr 14, 2016 at 10:14 AM, Alain RODRIGUEZ
wrote:
> Would adding nodes be the right way to start if I want to get the data per
>> node down
>
>
> Yes, if everything else is fine, the last and always available option to
> red
aster/examples/cassandra
Is there a better approach to deploying a Cassandra/DSE cluster than
Kubernetes?
Thanks.
-- Jack Krupansky
Facets can be used, and grouping of results as well, in DSE Search (Solr),
but there are a lot of different approaches that can be used, depending on
the specific user experience you require.
-- Jack Krupansky
On Tue, Apr 12, 2016 at 9:32 PM, Gross, Daniel
wrote:
> Hi Jack,
>
>
>
full Solr searches, including faceting.
The new SASI secondary index feature in Cassandra 3.4 can be used for some
more sophisticated searches as well, but it's not quite up to what Stratio
and DSE Search can do.
-- Jack Krupansky
On Tue, Apr 12, 2016 at 8:07 PM, Gross, Daniel
wrote:
Which instance type are you using? Some may be throttled for EBS access, so
you could bump into a rate limit, and who knows what AWS will do at that
point.
-- Jack Krupansky
On Tue, Apr 12, 2016 at 6:02 AM, Alessandro Pieri
wrote:
> Thanks Chris for your reply.
>
> I ran the tests 3
e the FOT is setting an output column value to NULL.
Also, see if there is a "Caused By" entry elsewhere in the Java stack trace.
-- Jack Krupansky
On Tue, Apr 12, 2016 at 6:07 AM, Joseph Tech wrote:
> hi,
>
> I am facing an issue where Solr queries executed from cqlsh using t
.
-- Jack Krupansky
On Mon, Apr 11, 2016 at 6:15 PM, Jim Ancona wrote:
>
> On Mon, Apr 11, 2016 at 4:19 PM, Jack Krupansky
> wrote:
>
>> Some of this may depend on exactly how you are using so-called COMPACT
>> STORAGE. I mean, if your tables really are modeled as all b
document given the document text.
-- Jack Krupansky
On Mon, Apr 11, 2016 at 7:12 PM, James Carman
wrote:
> S3 maybe?
>
> On Mon, Apr 11, 2016 at 7:05 PM Robert Wille wrote:
>
>> I do realize its kind of a weird use case, but it is legitimate. I have a
>> collection of docume
So, where are we? Is it just the complaint that migration is slow and
re-modeling is difficult, or are there specific questions about how to do
the re-modeling?
-- Jack Krupansky
On Mon, Apr 11, 2016 at 1:30 PM, Anuj Wadehra
wrote:
> Thanks Jim. I think you understand the pain of migrat
tition being treated
as a single row.
-- Jack Krupansky
On Mon, Apr 11, 2016 at 11:46 AM, Emīls Šolmanis
wrote:
> Wouldn't the "number of keys" part of *nodetool cfstats* run on every
> node, summed and divided by replication factor give you a decent
> approximation?
bite the bullet and re-model your data to exploit
the features of CQL rather than fight CQL trying to mimic Thrift per se.
In any case, take another shot at framing the problem and then maybe people
here can help you out.
-- Jack Krupansky
On Mon, Apr 11, 2016 at 10:39 AM, Anuj Wadehra
wrote
for q=*:* and that will very quickly return the total row count. I
presume that Stratio will handle this fine as well.
-- Jack Krupansky
On Mon, Apr 11, 2016 at 11:10 AM, wrote:
> Cassandra is not good for table scan type queries (which count(*)
> typically is). While there are some attem
(And what's the cost of a DSE license for DSE with Cassandra 3.x/3.5? No
fair telling people they have to wait for DSE 5.0! Or 5.x, whenever
Cassandra 3.4/3.5 will be supported.)
-- Jack Krupansky
On Mon, Apr 11, 2016 at 11:04 AM, wrote:
> For 2.2 and earlier, there are no license fe
/preferred technique? For example, is it more efficient to
query the row count one node at a time?
And for bonus points: How do you count (CQL) rows for each node? Again,
excluding replication.
-- Jack Krupansky
Not that we aren't enthusiastic about you moving to Cassandra, but it needs
to be for the right reasons, and for Cassandra the right reasons are
scaling and HA.
In case it's not obvious, I would make a really lousy used-car or
real-estate/time-share salesman!
-- Jack Krupansky
On
andra (properly.)
-- Jack Krupansky
On Wed, Apr 6, 2016 at 10:30 AM, Paco Trujillo
wrote:
> The fact that there is one single DC does not mean that you do not need
> multiples nodes. Without multiples nodes you do not have redundancy (the
> nodes fail and you lose the database) and you
applications which have a lot of data
and the need for high availability (redundancy, meaning at least three
copies of the data.) Neither of which seems to be your requirement.
How much data do you have? What led you to believe that you only need a
single node?
-- Jack Krupansky
On Wed, Apr 6
cluster as the other tenants.
Were there any other specific reasons for choosing Cassandra other than
pursuing multi-tenancy? Out of curiosity, what source of information
pointed you in the direction of multi-tenancy?
-- Jack Krupansky
On Wed, Apr 6, 2016 at 1:17 AM, Kai Wang wrote:
> With sm
collection of applications which share the same data. If
there are multiple applications that don't share the same data, then they
absolutely should be on separate clusters.
-- Jack Krupansky
On Tue, Apr 5, 2016 at 5:40 PM, Kai Wang wrote:
> Once a while the question about table count rises
Maybe that's a great definition of a modern distributed cluster: each
person (node) has a different notion of priority.
I'll wait for the next user email in which they complain that their data is
"too stable" (missing updates.)
-- Jack Krupansky
On Thu, Mar 31, 2016 at 12:
acceptable full repair times
for nodes and what the resulting node data size is.
What impact vnodes has on these numbers is a bonus question.
Thanks!
-- Jack Krupansky
whether 64 or even 32 would deliver acceptable query performance?
Anybody here have any practical experience on this issue, either testing or
even better, in production?
Absent any further input, my advice would be to limit DSE Search/Solr to a
token count of 64 per node.
-- Jack Krupansky
The exception message has an empty column name. Odd. Not sure if that is a
bug in the exception code or whether you actually have an empty column name
somewhere.
Did you use the absolutely exact same commands to create the keyspace,
table, and custom index as in the Stratio readme?
-- Jack
range of potential queries? Which are the most common and need to be
the fastest?
-- Jack Krupansky
On Mon, Mar 28, 2016 at 12:10 PM, Lokesh Ceeba - Vendor <
lokesh.ce...@walmart.com> wrote:
> Hello Team,
>
>How to design/develop the best data model for this JSON ?
com/en/cassandra/3.x/cassandra/dml/dmlConfigConsistency.html
.
In short, Cassandra does indeed guarantee the degree of immediate
consistency that you specify (and presumably want.)
-- Jack Krupansky
On Sun, Mar 27, 2016 at 6:36 PM, Harikrishnan A wrote:
> Hello,
>
> I have a question re
patterns will drive the data modeling, and
also impact how much data you can realistically place on each node.
What are your HA (High Availability) requirements?
-- Jack Krupansky
On Fri, Mar 25, 2016 at 2:40 PM, Jonathan Haddad wrote:
> You can use keyspaces with multiple data centers to
= 93.75 MB/sec, which is fairly close to your
numbers, so just a little write amplification or spiking or fuzzy math on
AWS end might trigger some AWS throttling.
-- Jack Krupansky
On Fri, Mar 25, 2016 at 11:42 AM, Giampaolo Trapasso <
giampaolo.trapa...@radicalbit.io> wrote:
>
It depends on how much data you have. A single node can store a lot of
data, but the more data you have the longer a repair or node replacement
will take. How long can you tolerate for a full repair or node replacement?
Generally, RF=3 is both sufficient and recommended.
-- Jack Krupansky
On
attern for
Cassandra. But... you can probably get it to work with enough care and
sufficient provisioning of the cluster.
The big problem is that rapid, large-scale removal from the queue generates
tons of tombstones that need to be removed.
The DateTieredCompactionStrategy may help as well.
-- Jack
, but normally apps try to issue requests to a local data
center for performance. Having to ping all data centers on all requests to
achieve a quorum seems a bit excessive.
Can you advise us on your thinking when you selected RF=2?
-- Jack Krupansky
On Thu, Mar 24, 2016 at 2:17 AM, Dikang Gu
ata
can be retrieved even when a rack-level failure occurs.
In short, if CL=ALL is acceptable, then you might as well dump the
rack-aware approach, which was how you got into this situation in the first
place.
-- Jack Krupansky
On Wed, Mar 23, 2016 at 7:31 PM, Anubhav Kale
wrote:
> I ran into
iling list is always a good idea, but as we continually
see, people have difficulty even discerning the distinction between the
Cassandra user list and the driver user lists. In truth, to some (a lot) of
us, this distinction between "user" and "driver" is quite baffling. Sor
executedby is the ID assigned to an employee.
I'm presuming that JSON is to be used for objectbefore/after. This suggests
no ability to query by individual object fields. I didn't sense any other
columns that would be JSON.
-- Jack Krupansky
On Wed, Mar 16, 2016 at 3:48 PM, Tom van
highlight what the difference is that causes the problem.
Doc:
http://docs.datastax.com/en/latest-dse/datastax_enterprise/srch/srchTrnsFrm.html
-- Jack Krupansky
On Fri, Mar 18, 2016 at 4:30 AM, Joseph Tech wrote:
> Hi,
>
> I had setup a single-node DSE 4.8.x to start in Search mode t
lease.
-- Jack Krupansky
On Thu, Mar 17, 2016 at 10:39 AM, Rakesh Kumar
wrote:
> > 1. They have a published support policy:
> > http://www.datastax.com/support-policy/supported-software
>
> Why is the version number so different from the cassandra community
> editio
that an MV PK can only include one non-PK
data column - CASSANDRA-9928
<https://issues.apache.org/jira/browse/CASSANDRA-9928>.)
-- Jack Krupansky
On Wed, Mar 16, 2016 at 4:40 PM, I PVP wrote:
> Jack/Tom
> Thanks for answering.
>
> Here is the table definition so far:
>
>
1. They have a published support policy:
http://www.datastax.com/support-policy/supported-software
-- Jack Krupansky
On Thu, Mar 17, 2016 at 10:09 AM, Rakesh Kumar
wrote:
> Few questions:
>
> 1 - Has there been an announcement as to when Datastax will stop
> supporting 2.x v
value which can directly be
mapped to a node (or multiple nodes with replication.) Ad hoc, complex, and
expensive queries are anti-patterns in Cassandra (very discouraged if not
outright not supported.)
-- Jack Krupansky
On Thu, Mar 17, 2016 at 12:25 PM, Thouraya TH wrote:
> Yes, i have tes
Be sure to post your final (working) insert for others to learn from!
-- Jack Krupansky
On Tue, Mar 15, 2016 at 11:56 AM, Rami Badran
wrote:
> thanks got it
>
> On Tue, Mar 15, 2016 at 5:54 PM, Jack Krupansky
> wrote:
>
>> There's a UDT example in the doc, showing
There's a UDT example in the doc, showing that you don't put quotes around
the UDT key names:
https://docs.datastax.com/en/cql/3.3/cql/cql_using/useInsertUDT.html
-- Jack Krupansky
On Tue, Mar 15, 2016 at 11:52 AM, Jack Krupansky
wrote:
> In any case, please post any diagn
In any case, please post any diagnostic message/exception that you may be
getting.
-- Jack Krupansky
On Tue, Mar 15, 2016 at 11:13 AM, Rami Badran
wrote:
> sorry like this
> insert into users (uid,loginIds) values ('111','{ 'emails' : '{'
No quotes around the UDT key names. (Or use double quotes.)
-- Jack Krupansky
On Tue, Mar 15, 2016 at 10:56 AM, Rami Badran
wrote:
> here is the CQL
>
> insert into users (uid,loginIds) values ('111',{ 'emails' : {'
> f...@baggins.com', '
still needs to be centered on point queries and narrow
contiguous slices.
Even with Spark and analytics that may indeed need to do a full scan of a
large amount of data, the model needs to be that the big scan is done in
small chunks.
-- Jack Krupansky
On Sat, Mar 12, 2016 at 10:23 AM, Jason
Thanks, that level of query detail gives us a better picture to focus on. I
think through this some more over the weekend.
Also, these queries focus on raw, bulk retrieval of sensor data readings,
but do you have reading-based queries, such as range of an actual sensor
reading?
-- Jack Krupansky
ber of rows) without
hitting a bulk size issue for the partition. But... I don't want to jump to
solutions until we have a firmer handle on the query side of the fence.
-- Jack Krupansky
On Fri, Mar 11, 2016 at 5:37 PM, Jason Kania wrote:
> Jack,
>
> Thanks for the response.
>
&
standing all of this other stuff upfront.
-- Jack Krupansky
On Thu, Mar 10, 2016 at 12:39 PM, Jason Kania wrote:
> Jack,
>
> Thanks for the response. I don't think I provided enough information and
> used the wrong terminology as your response is more the canned advice is
> re
What is your schema and data like - in particular, how wide are your
partitions (number of rows and typical row size)?
Maybe you just need (a lot) more heap for rows during the repair process.
-- Jack Krupansky
On Fri, Mar 11, 2016 at 11:19 AM, Adam Plumb wrote:
> These are brand new bo
(for 2.2
and 3.x)
-- Jack Krupansky
On Thu, Mar 10, 2016 at 5:14 PM, Rakesh Kumar wrote:
> I am using default Murmur3. So are you saying in case of Murmur3 the
> following two queries
>
> select count*)
> where customer_id = '289'
> and event_time >= '201
ons of the repo.
Interesting. I mean, I wanted to search through the code as of the tag for
2.2.4. You would have to actually check out the code from that tag and then
search in an IDE.
-- Jack Krupansky
On Thu, Mar 10, 2016 at 3:53 PM, Emīls Šolmanis
wrote:
>
> Jack
>
> Yeah, I tra
ou can use
RDBMS-like WHERE conditions to select a slice of the partition.
-- Jack Krupansky
On Thu, Mar 10, 2016 at 4:45 PM, Rakesh Kumar wrote:
>
> typo: the primary key was (customer_id + event_time )
>
>
> -Original Message-
> From: Rakesh Kumar
> To: user
&g
commit log on a
separate SSD device. That should probably be mentioned.
-- Jack Krupansky
On Thu, Mar 10, 2016 at 12:52 PM, Matt Kennedy
wrote:
> It isn't really the data written by the host that you're concerned with,
> it's the data written by your application. I'd start b
Did you ever find the source of the message? I couldn't find it in github
either, either in the driver or Cassandra proper.
-- Jack Krupansky
On Thu, Mar 10, 2016 at 12:39 PM, Emīls Šolmanis
wrote:
> In case someone stumbles upon this same thing later.
>
> Ended up being a collec
ditional tables.
As a general proposition, Cassandra should not be used for heavy filtering
- query tables with the filtering criteria baked into the PK is the way to
go.
-- Jack Krupansky
On Thu, Mar 10, 2016 at 8:54 AM, Jason Kania wrote:
> Hi,
>
> We have sensor input that cr
ich trades off performance for storage capacity. But... that
would be an enhancement, not something that is "supported" out of the box
today. What use cases would this satisfy? I mean, who is it that can get
away with sacrificing performance these days?
-- Jack Krupansky
On Mon, Mar 7, 201
How far out of sync are the nodes? A few minutes or less? Many hours?
Worst case, you could simply take the entire cluster down until that future
time has passed and then bring it back up.
-- Jack Krupansky
On Wed, Mar 9, 2016 at 11:27 AM, Jeff Jirsa
wrote:
> If you don’t overwrite or del
small is small? Six nodes?
-- Jack Krupansky
On Mon, Mar 7, 2016 at 5:57 AM, Krzysztof Księżyk
wrote:
> Hi,
>
> I have small Cassandra cluster running on boxes with 256GB SSD and 2TB HDD.
> Originally SSD was for system and commit log and HDD for data. But
> unfortunately becau
ports
keyword and prefix/suffix search. But it doesn't support multi-column ad
hoc queries, which is what people tend to use Lucene and Solr for. So,
again, it all depends on your queries and your data cardinality.
-- Jack Krupansky
On Sun, Mar 6, 2016 at 1:29 AM, Bhuvan Rawal wrote:
> Yes
You haven't been clear about how you intend to add Solr. You can also use
Stratio or Stargate for basic Lucene search if you don't want need full
Solr support and want to stick to open source rather than go with DSE
Search for Solr.
-- Jack Krupansky
On Sun, Mar 6, 2016 at 12:25 AM, Bh
are absolute requirements.
-- Jack Krupansky
On Fri, Mar 4, 2016 at 9:04 PM, Hiroyuki Yamada wrote:
> Hi,
>
> I'm working on some POCs for Cassandra with single 2GB RAM node
> environment and
> some issues came up with me, so let me ask here.
>
> I have tried to insert
Is this a secondary indexer of your own design so that you know that
changing the options will be safe for existing index entries?
It might be worth a Jira.
Otherwise, you may jus have to manually go in and hack the information
under the hood.
-- Jack Krupansky
On Fri, Mar 4, 2016 at 12:14 PM
?
When you say that the failures don't last for more than a few minutes, you
mean from the moment you perform the nodetool removenode? And is operation
completely normal after those few minutes?
-- Jack Krupansky
On Thu, Mar 3, 2016 at 4:40 PM, Peddi, Praveen wrote:
> Hi Jack,
>
>
of nodes that were removed?
How many seed nodes does each node typically have?
-- Jack Krupansky
On Thu, Mar 3, 2016 at 4:16 PM, Peddi, Praveen wrote:
> Thanks Alain for quick and detailed response. My answers inline. One thing
> I want to clarify is, the nodes got recycled due to some aut
It is the total table count, across all key spaces. Memory is memory.
-- Jack Krupansky
On Tue, Mar 1, 2016 at 6:26 PM, Brian Sam-Bodden
wrote:
> Eric,
> Is the keyspace as a multitenancy solution as bad as the many tables
> pattern? Is the memory overhead of keyspaces as heavy a
Thrift? Hah! Sorry, I can't help you if you are going that route. I
recommend CQL - only.
-- Jack Krupansky
On Tue, Mar 1, 2016 at 4:47 PM, Sandeep Kalra
wrote:
> The way I was planning is to give a restful interface to lookup details of
> a question, and then user must get compl
It would be nice to get this info into the doc or at least a blog post.
-- Jack Krupansky
On Tue, Mar 1, 2016 at 4:37 PM, Tyler Hobbs wrote:
>
> On Tue, Mar 1, 2016 at 6:13 AM, Vlad wrote:
>
>> So commit log can't keep more than memtable size, why is difference in
>>
Okay, so a very large number of questions, each with a very modest number
of answers (generally under 5), each with a modest number of comments
(generally under 5).
Now we're back to the issue of how you wish to query and access the data.
-- Jack Krupansky
On Tue, Mar 1, 2016 at 12:
I would spin it as Cassandra being the right choice where your primary need
in OLTP and with a secondary need for analytics. IOW, where you would
otherwise need to use two separate databases for the same data.
-- Jack Krupansky
On Tue, Mar 1, 2016 at 12:40 PM, Jonathan Haddad wrote:
> Sp
Clustering columns are your friends.
But the first question is how you need to query the data. Queries drive
data models in Cassandra.
What is the cardinality of this data - how many answers per question and
how many comments per answer?
-- Jack Krupansky
On Tue, Mar 1, 2016 at 12:23 PM
with
string key values effectively gives you extensible columns.
-- Jack Krupansky
On Tue, Mar 1, 2016 at 11:22 AM, Andrés Ivaldi wrote:
> Jonathan thanks for the link,
> I believe that maybe is good as Data Store part, because is fast for I/o
> and handles Time Series, for analytics
mate use case that can't easily
be handled by a single table, that could get the discussion started.
-- Jack Krupansky
On Tue, Mar 1, 2016 at 9:11 AM, Fernando Jimenez <
fernando.jime...@wealth-port.com> wrote:
> Hi Jack
>
> Being purposefully developed to only handle up to “a few h
se is strongly not recommended.
As the Jira notes, "having more than dozens or hundreds of tables defined
is almost certainly a Bad Idea."
"Bad Idea" means not good. As in don't go there. And if you do, don't
expect such a mis-adventure to be supported by the community
, your specific access
patterns, and your specific load. And it also depends on your own personal
tolerance for degradation of latency and throughput - some people might
find a given set of performance metrics acceptable while other might not.
-- Jack Krupansky
On Tue, Mar 1, 2016 at 3:54 AM, F
asically have two choices: an additional cluster column to distinguish
categories of table, or separate clusters for each few hundred of tables.
-- Jack Krupansky
On Mon, Feb 29, 2016 at 12:30 PM, Fernando Jimenez <
fernando.jime...@wealth-port.com> wrote:
> Hi all
>
> I have a u
There is an open Jira on this exact topic - Change Data Capture (CDC):
https://issues.apache.org/jira/browse/CASSANDRA-8844
Unfortunately, open means not yet done.
-- Jack Krupansky
On Thu, Feb 25, 2016 at 2:13 AM, Charulata Sharma (charshar) <
chars...@cisco.com> wrote:
> Thank
s commence
immediately, fairly soon, or only after about as long as they take from a
clean fresh start?
-- Jack Krupansky
On Wed, Feb 24, 2016 at 7:04 PM, Mike Heffner wrote:
> Nate,
>
> So we have run several install tests, bisecting the 2.1.x release line,
> and we believe t
o
under which the user would hit this? I mean, why would the code care either
way with respect to JBOD strategy for the case where no local data is
stored?
-- Jack Krupansky
On Wed, Feb 24, 2016 at 2:15 AM, Marcus Eriksson wrote:
> It is mentioned here btw: http://www.datastax.com/dev/blog/im
are seeing for
device space utilization.
Thanks!
-- Jack Krupansky
most technical problems on a node would be clearly logged on that
node. If you see a lapse of connectivity no more than once or twice a day,
consider yourselves lucky.
Is it only one node at a time that goes down, and at widely dispersed times?
How many nodes?
-- Jack Krupansky
On Tue, Feb 23
.
What type of info did you wish to pass around?
-- Jack Krupansky
On Sun, Feb 21, 2016 at 8:56 AM, Thouraya TH wrote:
> Hi all;
>
> Please, where can i find what are the details saved by gossip protocol ?
>
> Is it possible to add other informations to informations exchanged
But again, you could also simply spawn a process running Cassandra as-is in
its intended form which would eliminate the potential for conflict between
the app heap and Casandra's JVM heap.
-- Jack Krupansky
On Mon, Feb 15, 2016 at 12:56 AM, Jan Kesten wrote:
> Hi,
>
> the embedde
What does your query actually look like today?
Is your non-EQ on timestamp selecting a single row a few rows or many rows
(dozens, hundreds, thousands)?
-- Jack Krupansky
On Sun, Feb 14, 2016 at 7:40 PM, Gianluca Borello
wrote:
> Thanks again.
>
> One clarification about "readi
You can definitely read all of columns in a single SELECT. And the
n-INSERTS can be batched and will insert fewer cells in the storage engine
than the previous approach.
-- Jack Krupansky
On Sun, Feb 14, 2016 at 7:31 PM, Gianluca Borello
wrote:
> Thank you for your reply.
>
> Your
of them.
-- Jack Krupansky
On Sun, Feb 14, 2016 at 5:22 PM, Gianluca Borello
wrote:
> Hi
>
> I've just painfully discovered a "little" detail in Cassandra: Cassandra
> touches all columns on a CQL select (related issues
> https://issues.apache.org/jira/
What motivated the use of an embedded instance for development - as opposed
to simply spawning a process for Cassandra?
-- Jack Krupansky
On Sun, Feb 14, 2016 at 2:05 PM, John Sanda wrote:
> The project I work on day to day uses an embedded instance of Cassandra,
> but it is intend
des.
That said, if any of the senior Cassandra developers wish to personally
support your efforts towards embedded clusters, they are certainly free to
do so. we'll see if any of them step forward.
-- Jack Krupansky
On Sat, Feb 13, 2016 at 3:47 PM, Binil Thomas wrote:
> Hi all,
>
&
problem recurs for that node?
-- Jack Krupansky
On Fri, Feb 12, 2016 at 4:06 AM, Skvazh Roman wrote:
> Hello!
> We have a cluster of 25 c3.4xlarge nodes (16 cores, 32 GiB) with attached
> 1.5 TB 4000 PIOPS EBS drive.
> Sometimes one or two nodes user cpu spikes to 100%, load aver
(Note to self... check docs to see if they give this troubleshooting tip. I
didn't see it at first glance.)
-- Jack Krupansky
On Thu, Feb 11, 2016 at 2:45 PM, Kai Wang wrote:
> Are you supplying timestamps from the client side? Are clocks in sync
> cross your nodes?
>
>
>
mitigation efforts if their infrastructure does not implicitly effect
mitigation for various security exposures.
-- Jack Krupansky
On Thu, Feb 11, 2016 at 3:21 PM, oleg yusim wrote:
> Robert, Jack, Bryan,
>
> As you suggested, I put together document, titled
> Cassandra_Security_Topics
document or is it strictly
internal for your employer? I know there is a database of these
assessments, but I don't know who controls what becomes public and when.
-- Jack Krupansky
On Thu, Feb 11, 2016 at 3:23 PM, oleg yusim wrote:
> Hi Dani,
>
> As promised, I sort of put all my q
are you indexing map columns, keys or values?
-- Jack Krupansky
On Thu, Feb 11, 2016 at 10:44 AM, Clint Martin <
clintlmar...@coolfiretechnologies.com> wrote:
> I have experienced excessive performance issues while using collections as
> well. Mostly my issue was due to the excessi
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