You don't need any reputation points to ask a new question with an existing
tag - just type opscenter in the Tags box under the question. Otherwise,
how would any new user ever be able to ask a question and have it tagged?!
-- Jack Krupansky
-Original Message-
From: Drew from
.
-- Jack Krupansky
From: Laing, Michael
Sent: Thursday, March 13, 2014 1:39 PM
To: user@cassandra.apache.org
Subject: Re: CQL Select Map using an IN relationship
Think of them as:
PRIMARY KEY (partition_key[, range_key])
where the partition_key can be compounded as:
(partition_key0
it does come down to how you will be accessing the data – query,
view, update.
-- Jack Krupansky
From: Donald Smith
Sent: Wednesday, March 26, 2014 1:22 PM
To: mailto:user@cassandra.apache.org
Subject: Question about how compaction and partition keys interact
In CQL we need to decide between using
Take a look at the DataStax Enterprise Security Management.
http://www.datastax.com/documentation/datastax_enterprise/4.0/datastax_enterprise/sec/secDSE.html
-- Jack Krupansky
From: Check Peck
Sent: Friday, April 4, 2014 11:54 PM
To: user
Subject: Securing Cassandra database
Hi All,
We
DevCenter makes it easy to query and display data and execute commands against
Cassandra, but it doesn’t have a spreadsheet-like tool for hand editing
columns. That sounds like a great suggestion to make.
See:
http://www.datastax.com/what-we-offer/products-services/devcenter
-- Jack Krupansky
on Lucene for the core underlying
indexing and query layers.
-- Jack Krupansky
From: Jon Haddad
Sent: Saturday, May 3, 2014 4:03 AM
To: user@cassandra.apache.org
Subject: Re: Cassandra vs Elasticsearch.
Agreed w/ ES not being the durable data store. I would recommend treating it
as ephemeral
Here’s a meetup talk on analytics using Cassandra, Storm, and Kafka:
http://www.slideshare.net/aih1013/building-largescale-analytics-platform-with-storm-kafka-and-cassandra-nyc-storm-user-group-meetup-21st-nov-2013
-- Jack Krupansky
From: Manoj Khangaonkar
Sent: Thursday, May 8, 2014 5:43 PM
You can always check the project committer wiki:
http://wiki.apache.org/cassandra/Committers
-- Jack Krupansky
From: Kevin Burton
Sent: Wednesday, May 14, 2014 4:39 PM
To: user@cassandra.apache.org
Subject: What % of cassandra developers are employed by Datastax?
I'm curious what
) and support for Cassandra:
http://wiki.apache.org/cassandra/ThirdPartySupport
(For disclosure, I am a part-time contractor for DataStax, but now on the sales
side, although by background is as a developer.)
-- Jack Krupansky
From: Dave Brosius
Sent: Saturday, May 17, 2014 10:48 AM
To: user
You might want to review this blog post on supporting dynamic columns in CQL3,
which points out that “the way to model dynamic cells in CQL is with a compound
primary key.”
See:
http://www.datastax.com/dev/blog/does-cql-support-dynamic-columns-wide-rows
-- Jack Krupansky
From: Maciej Miklas
To keep the terminology clear, your “row_key” is actually the “partition key”,
and “wide_row_column” is actually a “clustering column”, and the combination of
your row_key and wide_row_column is a “compound primary key”.
-- Jack Krupansky
From: Aaron Morton
Sent: Tuesday, May 20, 2014 3:06 AM
of performance for
a real cluster, especially compared to a server with more CPU cores than your
laptop.
And for a real cluster, rows with different partition keys can be sent to a
coordinator node that owns that partition key, which could be multiple nodes
for RF1.
-- Jack Krupansky
From: Mark Farnan
You might check the doc:
http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_backup_restore_c.html
-- Jack Krupansky
From: ng
Sent: Monday, June 2, 2014 3:18 PM
To: user@cassandra.apache.org
Subject: Cassandra snapshot
I need to make sure that all the data in sstable
Yeah, it is in the doc:
http://www.datastax.com/documentation/cassandra/2.0/cassandra/configuration/configCassandra_yaml_r.html
And I don’t find a Jira issue mentioning it being removed, so... what’s the
full story there?!
-- Jack Krupansky
From: Idrén, Johan
Sent: Wednesday, June 4, 2014 8
And sorry that the doc confused you as well!
-- Jack Krupansky
From: Idrén, Johan
Sent: Wednesday, June 4, 2014 10:51 AM
To: user@cassandra.apache.org
Subject: Re: memtable mem usage off by 10?
I wasn’t supplying it, I was assuming it was using the default. It does not
exist in my config
How many rows (primary key values) are you writing for each partition of the
primary key? I mean, are there relatively few, or are these very wide
partitions?
Oh, I see! You’re writing 50,000,000 rows to a single partition! My, that IS
ambitious.
-- Jack Krupansky
From: Xu Zhongxing
Sent
The message does seem a little odd in that it refers to “assign”, but it would
make more sense to say “compare”.
-- Jack Krupansky
From: Kevin Burton
Sent: Friday, June 6, 2014 1:22 AM
To: user@cassandra.apache.org
Subject: Bad Request: Type error: cannot assign result of function token (type
balancing for multiple tables”
-- Jack Krupansky
From: Kevin Burton
Sent: Saturday, June 7, 2014 1:27 PM
To: user@cassandra.apache.org
Subject: Re: Data model for streaming a large table in real time.
I just checked the source and in 2.1.0 it's not deprecated.
So it *might* be *being
batches” as an anti-pattern:
http://www.slideshare.net/mattdennis
-- Jack Krupansky
From: Peter Sanford
Sent: Wednesday, June 11, 2014 7:34 PM
To: user@cassandra.apache.org
Subject: Re: Large number of row keys in query kills cluster
On Wed, Jun 11, 2014 at 10:12 AM, Jeremy Jongsma jer
The doc for backing up – and restoring – Cassandra is here:
http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_backup_restore_c.html
That doesn’t tell you how to move the “snapshot” to or from tape, but a
snapshot is the starting point for backing up Cassandra.
-- Jack
can select ‘foo_bar’. Ditto for
additional levels. And if you want each of the intermediate levels, pick a
serialization format such as JSON or BSON in addition to the flattened leaf
values. Anything in your use case(s) that doesn’t cover?
-- Jack Krupansky
From: Kevin Burton
Sent: Friday, June
The DataStax doc should be current best practices:
http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_repair_nodes_c.html
If you or anybody else finds it inadequate, speak up.
-- Jack Krupansky
-Original Message-
From: Paolo Crosato
Sent: Thursday, June 19
it may
generally complete quicker than you can do a query.
See:
http://www.datastax.com/documentation/cql/3.1/cql/ddl/ddl_build_index_c.html
AFAICT, there is no mechanism for guaranteeing that a 2i has been updated.
-- Jack Krupansky
From: Tom van den Berge
Sent: Thursday, June 19, 2014 5:26 AM
It would be nice to add that note to the doc.
And that leaves open the possibility that this feature may have a bug.
-- Jack Krupansky
From: DuyHai Doan
Sent: Sunday, June 22, 2014 12:01 PM
To: user@cassandra.apache.org
Subject: Re: Are writes to indexes performed asynchronously?
As far as I
support for DSE at this time.
-- Jack Krupansky
From: Som Nair
Sent: Friday, June 27, 2014 10:29 AM
To: user@cassandra.apache.org
Subject: Datastax DSE binaries
Hi
How and where do we include these binaries in a apache cassandra installation .
I would like to include these in a puppet
/upgrade/datastax_enterprise/upgrdAnyVersion.html
See:
http://www.datastax.com/wp-content/uploads/2014/04/WP-DataStax-Enterprise-Best-Practices.pdf
-- Jack Krupansky
From: Som Nair
Sent: Friday, June 27, 2014 11:28 AM
To: user@cassandra.apache.org
Subject: Re: Datastax DSE binaries
Hi Jack
It’s sloppy language in the doc. It is indeed a “ratio” – scroll down to the
example.
See:
http://www.datastax.com/documentation/cassandra/2.0/cassandra/tools/toolsCFstats.html
-- Jack Krupansky
From: Kevin Burton
Sent: Sunday, June 29, 2014 12:33 AM
To: user@cassandra.apache.org
Subject
. Since you only have 30,000 rows,
it probably doesn’t matter which way you go – organize your data based on how
it is logically structured and how you wish to access it.
-- Jack Krupansky
From: Wim Deblauwe
Sent: Tuesday, July 1, 2014 8:24 AM
To: user@cassandra.apache.org
Subject: Re: Primary
the
SlabAllocator.” Emphasis on “almost certainly a Bad Idea.”
See:
https://issues.apache.org/jira/browse/CASSANDRA-5935
“Allow disabling slab allocation”
IOW, this is considered an anti-pattern, but...
-- Jack Krupansky
From: tommaso barbugli
Sent: Wednesday, July 2, 2014 2:16 PM
To: user
You said that the updates do show up eventually – how long does it take?
-- Jack Krupansky
From: Sávio S. Teles de Oliveira
Sent: Thursday, July 3, 2014 1:30 PM
To: user@cassandra.apache.org
Subject: Re: Write Inconsistency to update a row
Are you sure all the nodes are working at that time
/datastax-opscenter
Here’s a feature comparison of some NoSQL databases:
http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-vs-redis
-- Jack Krupansky
From: Prem Yadav
Sent: Friday, July 4, 2014 10:37 AM
To: user@cassandra.apache.org
Subject: Cassandra use cases/Strengths/Weakness
Hi,
I have seen
manual partitioning when you have more than 25 million
rows or so. And then you have to pay attention to query latency as well.
First big question: It may be 100 million rows today, but what growth rate do
you anticipate?
-- Jack Krupansky
From: Matthias Hübner
Sent: Saturday, July 5, 2014 5:49 AM
to allow disabling the
SlabAllocator.” Emphasis on “almost certainly a Bad Idea.”
See:
https://issues.apache.org/jira/browse/CASSANDRA-5935
“Allow disabling slab allocation”
-- Jack Krupansky
From: Sourabh Agrawal
Sent: Thursday, July 10, 2014 11:22 PM
To: user@cassandra.apache.org
Subject
tables with 10 columns vs. 100 tables with 100 columns – it
should primarily be your queries (and updates) that drive the decision. Do
fewer tables and more columns make your queries (and updates) a lot simpler and
cleaner?
-- Jack Krupansky
From: tommaso barbugli
Sent: Saturday, July 12, 2014
cases look like?
By all means, start simple, but also be careful not to paint yourself into a
corner. In the alternative, be prepared to throw away entire implementations as
your conceptualization of the data evolves.
-- Jack Krupansky
From: tommaso barbugli
Sent: Saturday, July 12, 2014 3:12
tune Cassandra for single-node performance, but that seems lot a
lot of extra work, to me, compared to adding more cheap nodes.
-- Jack Krupansky
From: Diane Griffith
Sent: Thursday, July 17, 2014 9:31 AM
To: user
Subject: Re: trouble showing cluster scalability for read performance
Duncan
in a single partition would certainly not be a test of
“horizontal scaling” (adding nodes to handle more data – more token values or
partitions.)
-- Jack Krupansky
From: Diane Griffith
Sent: Thursday, July 17, 2014 1:33 PM
To: user
Subject: horizontal query scaling issues follow
and whether you are
using a small number of partition keys and a large number of clustering
columns, or does each row have a unique partition key and no clustering columns.
-- Jack Krupansky
From: Diane Griffith
Sent: Thursday, July 17, 2014 6:21 PM
To: user
Subject: Re: horizontal query scaling
SQL-like joins can be horrendously expensive.
-- Jack Krupansky
From: M.Tarkeshwar Rao
Sent: Tuesday, July 22, 2014 9:45 AM
To: user@cassandra.apache.org
Subject: I want either all the DML statements within the batch succeed or
rollback all. is it possible?
Hi all,
In the user guide
DSE, with Solr integration, does provide “field input transformers” so that you
can parse a column in JSON or any other format and then split it into any
number of Solr fields, including dynamic fields, which would then let you query
elements of that JSON.
-- Jack Krupansky
From: Alain
sharing knowledge on
this list is always a big step forward.
-- Jack Krupansky
From: spa...@gmail.com
Sent: Wednesday, July 23, 2014 4:25 AM
To: user@cassandra.apache.org
Subject: Re: Why is the cassandra documentation such poor quality?
I would like to help out with the documentation of C*. How do
I do recall seeing your announcement of your driver, but I think it got lost in
the discussion of whether it supported CQL. If you say it supports CQL and
native protocol, I’m sure it will get very prompt attention.
-- Jack Krupansky
From: Peter Lin
Sent: Wednesday, July 23, 2014 8:30 AM
Is it compute bound or I/O bound?
What does your cluster look like?
-- Jack Krupansky
From: Akshay Ballarpure
Sent: Wednesday, July 23, 2014 5:00 AM
To: user@cassandra.apache.org
Subject: CSV Import is taking huge time
Hello,
I am trying copy command in Cassandra to import CSV file in to DB
to for this two node cluster?
-- Jack Krupansky
From: Andrew
Sent: Wednesday, July 23, 2014 1:02 AM
To: graham sanderson ; user@cassandra.apache.org
Cc: Kevin Burton
Subject: Re: All writes fail with ONE consistency level when adding second node
to cluster?
I looked into this; ONE means
Out of curiosity, did you look at or utilize DataStax’s free online training?
See:
http://www.datastax.com/what-we-offer/products-services/training/virtual-training
Any feedback? Any suggestions as to what needs it does or doesn’t fulfill?
-- Jack Krupansky
From: Nicholas Okunew
Sent
immediate queries can see the data.
And as the description notes, hinted handoff will eventually propagate the data
(unless it times out and drops the hint.)
-- Jack Krupansky
From: Robert Coli
Sent: Wednesday, July 23, 2014 1:15 PM
To: user@cassandra.apache.org
Cc: Kevin Burton
Subject: Re: All
some people would prefer C8 or C7a– at least that would have a chance
of returning narrower Google search results than searching for “C*”.
-- Jack Krupansky
From: Mark Reddy
Sent: Thursday, July 24, 2014 4:04 AM
To: user@cassandra.apache.org
Subject: Re: What is C*?
Yes you are correct
?
-- Jack Krupansky
From: DuyHai Doan
Sent: Thursday, July 24, 2014 3:53 PM
To: user@cassandra.apache.org
Subject: Re: Hot, large row
Your extract of cfhistograms show that there are no particular wide rows. The
widest has 61214 cells which is big but not that huge to be really a concern
Blog posts are great for highlighting and focusing the community on new
features, changes, and techniques, but any knowledge content in them definitely
needs to be in the docs as well.
-- Jack Krupansky
From: Tyler Hobbs
Sent: Thursday, July 24, 2014 12:07 PM
To: user@cassandra.apache.org
Thanks. I’ll pass it along to the doc team.
-- Jack Krupansky
From: Kevin Burton
Sent: Thursday, July 24, 2014 6:34 PM
To: user@cassandra.apache.org
Subject: here's a good example of poor cassandra documentation.
so searching google for cassandra leveled compaction
there are no hits
Is it the accumulated tombstones on a row that make it act as if “wide”? Does
cfhistograms count the tombstones or subtract them when reporting on cell-count
for rows? (I don’t know.)
-- Jack Krupansky
From: Keith Wright
Sent: Friday, July 25, 2014 10:24 AM
To: user@cassandra.apache.org
Cc
of
the specifics.
-- Jack Krupansky
-Original Message-
From: Michael Dykman
Sent: Monday, July 28, 2014 10:35 AM
To: Cassandra Users
Subject: Re: Cassandra trigger following the CQL for Cassandra 2.0 tutorial
does not work
How to compile is a much biggest question and probably way off topic
This doesn’t seem like a reasonable use case for Cassandra. I mean, it’s not a
typical “database” use case.
-- Jack Krupansky
From: Philo Yang
Sent: Thursday, July 31, 2014 1:44 PM
To: user@cassandra.apache.org
Subject: select many rows one time or select many times?
Hi all,
I have
retry get you to 100% success? I would note that even the best
distributed systems do not guarantee zero failures for environmental issues,
so apps need to tolerate occasional failures.
-- Jack Krupansky
-Original Message-
From: Duncan Sands
Sent: Saturday, August 2, 2014 7:04 AM
apart, with no warning.
-- Jack Krupansky
From: Robert Coli
Sent: Monday, August 4, 2014 4:54 PM
To: user@cassandra.apache.org
Subject: Re: Reasonable range for the max number of tables?
On Mon, Aug 4, 2014 at 1:35 PM, Kevin Burton bur...@spinn3r.com wrote:
What are the bottlenecks here
in this
area.
-- Jack Krupansky
-Original Message-
From: Phil Luckhurst
Sent: Tuesday, August 5, 2014 4:09 AM
To: cassandra-u...@incubator.apache.org
Subject: Re: Reasonable range for the max number of tables?
Is there any mention of this limitation anywhere in the Cassandra
documentation
or is unlimited, is probably
not so important. Or, maybe, simply have a single limit, without the modes and
default it to 10 or 25 or some other relatively low number for “normal” apps.
This would be more developer-friendly, for both new and “normal” developers...
I think.
-- Jack Krupansky
” – in a partition would
be the number of rows you have inserted in that partition times the number of
columns you have declared in the table.
If you need to review the terminology:
http://www.datastax.com/dev/blog/does-cql-support-dynamic-columns-wide-rows
-- Jack Krupansky
From: hlqv
Sent: Tuesday
Agreed, but... in this case the table has ONE row, so what exactly could be
causing this timeout? I mean, it can’t be the row count, right?
-- Jack Krupansky
From: DuyHai Doan
Sent: Wednesday, August 13, 2014 9:01 AM
To: user@cassandra.apache.org
Subject: Re: range query times out (on 1 node
Are you more than 7 time zones behind GMT? If so, that would make 03:33 your
query less than 03:33-0700 Your query is using the default time zone, which
will be the time zone configured for the coordinator node executing the
query.
IOW, where are you?
-- Jack Krupansky
-Original
. And separate from the actual
data, which is stored in GMT.
-- Jack Krupansky
-Original Message-
From: Subodh Nijsure
Sent: Sunday, August 17, 2014 10:04 AM
To: user@cassandra.apache.org
Subject: Re: Strange select result when using date grater than query
I am in PST ( Oakland ).
I am
,
and the new nodes are not available until the new data center is completely
ready. And if something goes wrong, no harm to the existing nodes.
-- Jack Krupansky
-Original Message-
From: Robert Stupp
Sent: Sunday, August 17, 2014 11:17 AM
To: user@cassandra.apache.org
Subject: Re
With CQL3, you, the developer, get to decide whether to place a primary key
column in the partition key or as a clustering column. So, make sensorID the
partition key and datetime as a clustering column.
-- Jack Krupansky
From: Drew Kutcharian
Sent: Friday, August 29, 2014 6:48 PM
To: user
separate nodes?
I mean, the whole point of Cassandra is scalability and distributed processing,
right?
-- Jack Krupansky
From: Drew Kutcharian
Sent: Friday, August 29, 2014 7:31 PM
To: user@cassandra.apache.org
Subject: Re: Data partitioning and composite partition key
Hi Jack,
I think you
talking about?
One of the secrets of Cassandra is to use more, smaller requests in parallel,
rather than massive requests to a single coordinator node.
-- Jack Krupansky
From: Drew Kutcharian
Sent: Friday, August 29, 2014 8:28 PM
To: user@cassandra.apache.org
Subject: Re: Data partitioning
You might want to take a look at Titan, a graph database that can use Cassandra
as its storage engine, and see how it does these things.
-- Jack Krupansky
From: Todd Nine
Sent: Sunday, August 31, 2014 11:06 AM
To: user@cassandra.apache.org
Subject: Re: Help with migration from Thrift to CQL3
are “current” (or
“recent”)? Shouldn’t we be looking for and promoting “write once” approaches as
a much stronger preference/pattern? Or maybe I should say “write once and bulk
delete on aging” rather than the exercise in futility of doing a massive number
of deletes and updates in place?
-- Jack
I did see a reference to deletions: “overall approaches considering volumes,
deletion, compaction etc.” Did I merely misunderstand the reference? That’s all
I was responding to... sorry if my misunderstanding added any confusion!
-- Jack Krupansky
From: Laing, Michael
Sent: Monday, September
If you’re indexing and querying on that many columns (dozens, or more than a
handful), consider DSE/Solr, especially if you need to query on multiple
columns in the same query.
-- Jack Krupansky
From: Robert Coli
Sent: Monday, September 15, 2014 11:07 AM
To: user@cassandra.apache.org
Subject
for distributing
queries across the cluster. And... Lucene (underneath Solr) is optimal for
queries that span multiple fields. DSE/Solr supports CQL3 wide rows (clustering
columns.)
-- Jack Krupansky
From: Ram N
Sent: Monday, September 15, 2014 4:34 PM
To: user
Subject: Re: C 2.1
Jack,
Using Solr
Fixed. Thanks for reporting this!
-- Jack Krupansky
From: ziju feng
Sent: Tuesday, September 16, 2014 8:30 AM
To: user@cassandra.apache.org
Subject: Document of WRITETIME function needs update
Hi,
I found that the WRITETIME function on counter column returns date/time in
milliseconds
as well, but supports Solr query
syntax rather than needing to pass a structured JSON format.
SELECT * FROM persons WHERE solr_query=’name:jo* age:[20 TO 40]’;
And your app can use SolrJ or raw HTTP requests to talk to Solr within DSE as
well.
-- Jack Krupansky
From: Ram N
Sent: Wednesday
, and the
string columns in a string map collection, but... it’s best to first step back
and look at the big picture of what the data actually looks like as well as how
you want to query it.
-- Jack Krupansky
From: Les Hartzman
Sent: Friday, September 19, 2014 5:46 PM
To: user
Take a look at DataStax Enterprise as well, with its integrated Solr indexing
of Cassandra data.
-- Jack Krupansky
From: Arthur Zubarev
Sent: Sunday, September 28, 2014 10:55 AM
To: user@cassandra.apache.org
Subject: Indexes Fragmentation
Hi all:
A client on a RDBMS faces quick index
, but the
background question remains how you intend to access that updated data? I mean,
any perceived fragmentation may just be statistical noise compared to access
efficiency overall.
-- Jack Krupansky
From: Arthur Zubarev
Sent: Sunday, September 28, 2014 11:19 AM
To: user@cassandra.apache.org
available as well.
-- Jack Krupansky
From: DuyHai Doan
Sent: Friday, October 3, 2014 3:54 AM
To: user@cassandra.apache.org
Subject: Re: is lack of full text search hurting cassandra and datastax?
There are some options around for full text search integration with C*. Google
for Stratio deep
or the file system cache.
But as a general proposition, plan on having enough system memory to cache
your Lucene/Solr index. SSDs... are a bit different, but I'd still want most
of the index to fit in RAM.
-- Jack Krupansky
-Original Message-
From: Robert Wille
Sent: Saturday
consistency - to all nodes beyond
the immediate quorum.
-- Jack Krupansky
-Original Message-
From: William Katsak
Sent: Wednesday, October 8, 2014 12:27 PM
To: user@cassandra.apache.org
Subject: Consistency Levels
Hello,
I was wondering if anyone (Datastax?) has any usage data about
, that isn't necessarily a failure
is it?
All of that said, it depends on where you're trying to get to.
-- Jack Krupansky
-Original Message-
From: William Katsak
Sent: Wednesday, October 8, 2014 7:19 PM
To: user@cassandra.apache.org
Subject: Re: Consistency Levels
Thanks.
I am thinking
the
cluster, more confidence in maintaining the cluster, or... whatever else may
have been impacted. IOW, what actual benefit/change did you experience
firsthand. Thanks!
-- Jack Krupansky
and
OOM issues.
2. Replication redundancy is also for supporting higher load, not just
availability on node outage.
-- Jack Krupansky
From: Jabbar Azam
Sent: Friday, November 7, 2014 3:24 PM
To: user@cassandra.apache.org
Subject: Redundancy inside a cassandra node
Hello all,
My work
.
It would be nice if we had a way to calculate this number (both numbers) for
you so that a client (driver) could ping for it from the cluster, as well as
for the cluster to return a suggested wait interval before sending another
request based on actual load.
-- Jack Krupansky
-Original
most frequently. For
example, will aged data be deleted and with what frequency. It also depends on
what types of aggregations, or rollups, you might want to perform.
-- Jack Krupansky
From: Spico Florin
Sent: Thursday, November 27, 2014 7:38 AM
To: user@cassandra.apache.org
Subject: Storing
Planet Cassandra has some resource pages related to migrations to Cassandra.
For HBase:
http://planetcassandra.org/hbase-to-cassandra-migration/
There are pages for migration from Oracle, MySQL, MongoDB, and Redis, as well.
-- Jack Krupansky
From: Akshay Ballarpure
Sent: Friday, November 28
into memory
and performance issues.
There is an undocumented method to reduce the table overhead to support more
tables, but... if you are not expert enough to find it on your own, then you
are definitely not expert enough to be using it.
-- Jack Krupansky
From: Raj N
Sent: Tuesday, November
implementation to determine what
table limit works best for your use case.
-- Jack Krupansky
From: Raj N
Sent: Wednesday, December 3, 2014 4:54 PM
To: user@cassandra.apache.org
Subject: Re: Keyspace and table/cf limits
The question is more from a multi-tenancy point of view. We wanted to see
more
Thrift/slice oriented.
-- Jack Krupansky
From: Eric Stevens
Sent: Sunday, December 7, 2014 10:12 AM
To: user@cassandra.apache.org
Subject: Re: How to model data to achieve specific data locality
Also new seq_types can be added and old seq_types can be deleted. This means
I often need
or 10 million or...? Sure, buckets are a very real option, but if the
number of seq_types was only 10,000 to 50,000, then bucketing might be
unnecessary complexity and access overhead.
-- Jack Krupansky
From: Kai Wang
Sent: Sunday, December 7, 2014 3:06 PM
To: user@cassandra.apache.org
Subject
flies in the face of the admonition to to
refrain from using server-side distribution of requests.
At a minimum the CQL spec should make a more clear statement of intent and
non-intent for BATCH.
-- Jack Krupansky
From: Jonathan Haddad
Sent: Friday, December 12, 2014 12:58 PM
To: user
instances, both for the full corpus
and for the subset containing your 1.5 million words?
-- Jack Krupansky
From: Chamila Wijayarathna
Sent: Sunday, December 14, 2014 7:01 AM
To: user@cassandra.apache.org
Subject: Cassandra Database using too much space
Hello all,
We are trying to develop
limit –
beyond that you need to start using “buckets” to break up ultra-large
partitions.
Also, you need to look carefully at how you want to query each table.
-- Jack Krupansky
From: Chamila Wijayarathna
Sent: Sunday, December 14, 2014 11:36 PM
To: user@cassandra.apache.org
Subject: Re
clustering columns.
“The key” should just be a synonym for “primary key”, although sometimes people
are loosely speaking about “the partition” (which should be “the partition
key”) rather than the CQL “row”.
-- Jack Krupansky
From: Chamila Wijayarathna
Sent: Tuesday, December 16, 2014 8:03 AM
To: user
When you say “no need for tombstones”, did you actually read that somewhere or
were you just speculating? If the former, where exactly?
-- Jack Krupansky
From: Ian Rose
Sent: Tuesday, December 16, 2014 10:22 AM
To: user
Subject: does consistency=ALL for deletes obviate the need for tombstones
What RF?
Is the update and read immediately after the delete and insert, or is the
read after doing all the updates?
Is the delete and insert done with a single batch?
-- Jack Krupansky
On Thu, Dec 25, 2014 at 4:14 AM, yhq...@sina.com wrote:
Hi, all
I write a program to test
What do your CQL queries look like?
-- Jack Krupansky
On Fri, Dec 26, 2014 at 8:00 AM, yhq...@sina.com wrote:
Hi, all:
In my cf, each row has two column, one column is the timestamp(64bit),
another column is data which may be 500k about.
I read row, the qps is about 30.
I read
is needed.
Alternatively, you could hire a consultant to help guide you through the
application analysis process to determine your application
requirements, and then you could simply post your application
requirements, or at least a concise summary or relevant excerpt.
-- Jack Krupansky
-- Jack
Lucene directly:
https://github.com/Stratio/stratio-cassandra
3. Stargate which also uses Lucene directly:
http://tuplejump.github.io/stargate/
All three support Lucene queries in the WHERE clause of CQL SELECT. DSE
also supports direct Solr HTTP API access for both queries and updates.
-- Jack
).
-- Jack Krupansky
On Sat, Jan 3, 2015 at 2:31 PM, Sylvain Wallez sylv...@apache.org wrote:
From what I understand from the docs, the 64k limit applies to both the
number of items in a collection and the size of its elements?
Why is there a constraint on value size in collections, when
developers.
-- Jack Krupansky
On Mon, Feb 2, 2015 at 10:33 AM, Asit KAUSHIK asitkaushikno...@gmail.com
wrote:
HI All
We are working on a application logging project and this is one of the
search tables as below :
CREATE TABLE logentries (
logentrytimestamputcguid timeuuid PRIMARY KEY
, or... whatever.
-- Jack Krupansky
On Sun, Feb 8, 2015 at 1:48 AM, Ajaya Agrawal ajku@gmail.com wrote:
On Sun, Feb 8, 2015 at 5:03 AM, Eric Stevens migh...@gmail.com wrote:
I'm struggling to think of a model where it makes sense to update a
primary key as a typical operation. It suggests
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