We have wide rows which are composite of integer.byte array where some of our
columns are {empty}.byte array (ie. The first part of the composite key is
empty as in 0 length string or 0 length integer(ie. NOT 0, but basically null)
This has worked great when we look up all the entries with a
PlayOrm supports different types of wide rows like embedded list in the object,
etc. etc. There is a list of nosql patterns mixed with playorm patterns on
this page
http://buffalosw.com/wiki/patterns-page/
From: Les Hartzman lhartz...@gmail.commailto:lhartz...@gmail.com
Reply-To:
data) and ORM
Thanks Dean. I'll check that page out.
Les
On Wed, Oct 23, 2013 at 7:52 AM, Hiller, Dean
dean.hil...@nrel.govmailto:dean.hil...@nrel.gov wrote:
PlayOrm supports different types of wide rows like embedded list in the object,
etc. etc. There is a list of nosql patterns mixed
Read the paper Building on Quicksand especially the section where he
describes what they do at AmazonŠthe apology modelŠie. Allow overbooking
and apologize but limit overbookingŠ.That is one way to go and stay
scalable.
You may want to analyze the percentage change that overbooking can be as
600 is probably doable but each CF takes up memory……PlayOrm goes with a
strategy that can virtualize CF's into one CF allowing less memory usage….we
have 80,000 virtual CF's in cassandra through playorm….you can copy playorm's
pattern if desired. But 600 is probably doable but high. 10,000 is
Many applications in thrift use the wide row with composite column name and as
an example, let's say golf score for instance and we end up with golf score :
pk like so
null : pk56
null : pk45
89 : pk90
89: pk87
90: pk101
95: pk17
Notice that there are some who do not have a golf score(zero
I ran into this same issue on this stackoverflow post…
http://stackoverflow.com/questions/18963248/how-can-i-have-null-column-value-for-a-composite-key-column-in-cql3
Does anyone know how to have the same composite column name pattern that
enables wide rows with a null value?
Ie. We had some
Can ou describe what you mean by reverse compaction? I mean once you put
a row together and blow away sstables that contained it before, you can't
possibly know how to split it since that information is gone.
Perhaps you want the simple sstable2json script in the bin directory so
you can inspect
Anyone know how to debug cassandra processes just exiting? There is no info in
the cassandra logs and there is no heap dump file(which in the past has shown
up in /opt/cassandra/bin directory for me).
This occurs when running a map/reduce job that put severe load on the system.
The logs look
when it is desperately low on memory. Have a look in
either your syslog output of the output of dmesg
cheers
On Wed, Sep 18, 2013 at 10:21 PM, Hiller, Dean
dean.hil...@nrel.govmailto:dean.hil...@nrel.gov wrote:
Anyone know how to debug cassandra processes just exiting? There is no info
output of the output of dmesg
cheers
On Wed, Sep 18, 2013 at 10:21 PM, Hiller, Dean
dean.hil...@nrel.govjavascript:_e({},%20'cvml',%20'dean.hil...@nrel.gov');
wrote:
Anyone know how to debug cassandra processes just exiting? There is no info in
the cassandra logs and there is no heap dump file
, 2013 at 12:29 PM, Hiller, Dean
dean.hil...@nrel.govmailto:dean.hil...@nrel.gov wrote:
Actually, I have been on a few projects where something like that is
useful. Gemfire(a grid memory cache) had that feature which we used at
another company. On every project I encounter, there is usually one
:
A random guess - possibly an OOM (Out of Memory) where Linux will kill a
process to recover memory when it is desperately low on memory. Have a look
in either your syslog output of the output of dmesg
cheers
On Wed, Sep 18, 2013 at 10:21 PM, Hiller, Dean
dean.hil...@nrel.govmailto:dean.hil
1. Always in cassandra up your file descriptor limits on linux and even in
0.7 that was the recommendation so cassandra could open tons of files
2. We use 50M for our LCS with no performance issues. We had it 10M on our
previous with no issues but a huge amount of files of course with our
at 3:15 PM, Hiller, Dean
dean.hil...@nrel.govmailto:dean.hil...@nrel.gov wrote:
1. Always in cassandra up your file descriptor limits on linux and even in
0.7 that was the recommendation so cassandra could open tons of files
2. We use 50M for our LCS with no performance issues. We had it 10M
This article looks like it came out just one month ago or not even
http://blog.cloudera.com/blog/2013/08/how-to-select-the-right-hardware-for-your-new-hadoop-cluster/
And recommends 12-24 1-4TB disks in a JBOD configuration. I know hadoop is
used a lot in analytics but can also be used in some
You may want to be careful as column 1 could be stored in both files until
compaction as well when column 1 has encountered changes and cassandra returns
the latest column 1 version but two sstables contain column 1. (At least that
is the way I understand it).
Later,
Dean
From: Takenori Sato
Netflix created file streaming in astyanax into cassandra specifically because
writing too big a column cell is a bad thing. The limit is really dependent on
use case….do you have servers writing 1000's of 200Meg files at the same
time….if so, astyanax streaming may be a better way to go there
I was just wondering if cassandra had any special CF that every row exists on
every node for smaller tables that we would want to leverage in map/reduce.
The table row count is less than 500k and we are ok with slow updates to the
table, but this would make M/R blazingly fast since for every
node DCs if you really wanted it.
On Fri, Sep 13, 2013 at 12:29 PM, Hiller, Dean
dean.hil...@nrel.govmailto:dean.hil...@nrel.gov wrote:
Actually, I have been on a few projects where something like that is
useful. Gemfire(a grid memory cache) had that feature which we used at
another company
We are considering creating our own InputFormat for hadoop and running the
tasktrackers on every 3rd node(ie. RF=3) such that we cover all ranges. Our
M/R overhead appears to be 13 days vs. 12.5 hours on just reading SSTAbles
directly on our current data set.
I personally don't think parsing
Has anyone done performance tests on sstable reading vs. M/R? I did a quick
test on reading all SSTAbles in a LCS column family on 23 tables and took the
average time it took sstable2json(to /dev/null to make it faster) which was 7
seconds per table. (reading to stdout took 16 seconds per
is there a SSTableInput for Map/Reduce instead of ColumnFamily (which uses
thrift)?
We are not worried about repeated reads since we are idempotent but would
rather have the direct speed (even if we had to read from a snapshot, it would
be fine).
(We would most likely run our M/R on 4 nodes
Isn't this the log file from 10.0.0.146??? And this 10.0.0.146 sees that
10.0.0.111 is up, then sees it dead and in the log we can see it bind with this
line
INFO 12:16:23,108 Binding thrift service to
ip-10-0-0-146.ec2.internal/10.0.0.146:9160http://10.0.0.146:9160
What is the log file look
Yup, there are other types of indexing like that in PlayOrm which do it
differently so all nodes are not hit so it works better for instance if you are
partitioning your data and you query into just a single partition so it doesn't
put load on all the nodes. (of course, you have to have a
Message-
From: Hiller, Dean [mailto:dean.hil...@nrel.gov]
Sent: 21 August 2013 07:36
To: user@cassandra.apache.org
Subject: Re: Secondary Index Question
Yup, there are other types of indexing like that in PlayOrm which do it
differently so all nodes are not hit so it works better for instance
results ?
-Original Message-
From: Hiller, Dean [mailto:dean.hil...@nrel.gov]
Sent: 21 August 2013 07:36
To: user@cassandra.apache.org
Subject: Re: Secondary Index Question
Yup, there are other types of indexing like that in PlayOrm which do it
differently so all nodes are not hit so
Ugh, how did I miss that one, it was in the cassandra-cli --helpŠ.never
mind.
Dean
On 7/29/13 11:24 AM, Hiller, Dean dean.hil...@nrel.gov wrote:
I start nodetool with
Cassandra-cli p 9158 but it gives warnings about not displaying all
information because my JMX port is on 7197 instead of 7199
Is it possible to use CL_ONE with hadoop/cassandra when doing an M/R job? And
more importantly is there a way to configure that such that if my RF=3, that it
only reads from 1 of the nodes in that 3.
We have 12 nodes and ideally we would for example hope M/R runs on
a2, a9, a5, a12 which happen
Out of curiosity, what version of hadoop are you using with cassandra? I think
we are trying 0.20.2 if I remember(I have to ask my guy working on it to be
sure). I do remember him saying the cassandra maven dependency was odd in that
it is in the older version and not a newer hadoop version.
We use PlayOrm to have 60,000 VIRTUAL column families such that the performance
is just fine ;). You may want to try something like that.
Dean
From: Robert Coli rc...@eventbrite.commailto:rc...@eventbrite.com
Reply-To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
Out of curiosity, isn't what is really happening is this
As writes keep coming in, memory fills up causing flushes to the commit log
disk of the whole memtable. In a bursting scenario, writes are thus limited
only by memory and cpu in short bursting cases that tend to fit in memory. In
a
inserting data, even stopping Cassandra, cleaning my
entire data folder and then starting it again.
I am also really curious to know if there is anyone else having these
problems or if it is just me...
Best regards,
Marcelo.
2013/7/23 Hiller, Dean dean.hil...@nrel.govmailto:dean.hil
Oh, and in the past 0.20.x has been pretty stable by the wayŠ..they
finally switched their numbering scheme thank god.
Dean
On 7/23/13 2:13 PM, Hiller, Dean dean.hil...@nrel.gov wrote:
Perhaps try 0.20.2 as
1. The maven pom files have cassandra depending on 0.20.2
2. The 0.20.2 default
-
Aaron Morton
Cassandra Consultant
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 11/07/2013, at 11:37 AM, Hiller, Dean
dean.hil...@nrel.govmailto:dean.hil...@nrel.gov wrote:
We have a 12 node production cluster and a 4 node QA cluster. We are starting
to think we are going to try
We have a 12 node production cluster and a 4 node QA cluster. We are starting
to think we are going to try to run a side by side cassandra instance in
production while we map/reduce from one cassandra into the new instance. We
are intending to do something like this
Modify all ports in
Another new release is up in maven repos…
- Astyanx is upgraded to 1.56.42
- Hbase support is almost done(barring those few test cases)
- And following issues are fixed: Thanks to snazy and hsn10 :)
https://github.com/deanhiller/playorm/issues/80
https://github.com/deanhiller/playorm/issues/81
We loaded 5 million columns into a single row and when accessing the first 30k
and last 30k columns we saw no performance difference. We tried just loading 2
rows from the beginning and end and saw no performance difference. I am sure
reverse sort is there for a reason though. In what
We use playorm to do 80,000 virtual column families(a playorm feature though
the pattern could be copied). We did find out later and we are working on this
now that we wanted to map 80,000 virtual CF's into 10 real CF's so leveled
compaction can run more in parallel though or else we get stuck
Oh and if you are using STCS, I don't think the below is an issue at all
since that can run in parallel if needed already.
Dean
On 7/1/13 10:24 AM, Hiller, Dean dean.hil...@nrel.gov wrote:
We use playorm to do 80,000 virtual column families(a playorm feature
though the pattern could be copied
What does CAS stand for? And is that the row locking feature like hbase's
setAndReadWinner that you give the previous val and next val and your next
val is returned if you won otherwise the current result is returned and
you know some other node won?
Thanks,
Dean
On 7/1/13 12:09 PM, Blair Zajac
along with the time series data ?
I had a quick look at the links and could not see anything.
Cheers
Aaron
-
Aaron Morton
Freelance Cassandra Consultant
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 22/06/2013, at 2:51 AM, Hiller, Dean
dean.hil
We would be very very interested in your results. We currently run 10M but
have heard of 256M sizes as well.
Please let us know what you find out.
Thanks,
Dean
From: Andrew Bialecki
andrew.biale...@gmail.commailto:andrew.biale...@gmail.com
Reply-To:
I haven't seen this error in a long time. We just received the below error in
production when rebuilding a node…any ideas on how to get around this? We had
rebuilt 3 other nodes already I think(we have been swapping hardware)
ERROR 06:32:21,474 Exception in thread Thread[ReadStage:1,5,main]
and auto bootstrap is true according to
this log
DEBUG 06:53:03,411 setting auto_bootstrap to true
OR better yet, if someone can point me to the code on where bootstrap is
decided so I can see why it decides not to bootstrap?
Thanks,
Dean
On 6/24/13 6:42 AM, Hiller, Dean dean.hil...@nrel.gov wrote
the unknown keyspace errors :( but it is bootstrapping now) and I assume I
can add node B back once all the data is in there.
Thanks,
Dean
On 6/24/13 6:55 AM, Hiller, Dean dean.hil...@nrel.gov wrote:
Ah, so digging deeper, it is not bootstrapping. How do I force the node
to bootstrap
For ease of use, we actually had a single cassandra.yaml deployed to every
machine and a script that swapped out the token and listen address. I had seed
nodes ip1,ip2,ip3 as the seeds but what I didn't realize was then that these
nodes had themselves as seeds. I am assuming that should never
...@eventbrite.commailto:rc...@eventbrite.com
To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
Sent: Monday, June 24, 2013 10:34 AM
Subject: Re: AssertionError: Unknown keyspace?
On Mon, Jun 24, 2013 at 6:04 AM, Hiller, Dean
dean.hil...@nrel.govmailto:dean.hil...@nrel.gov wrote:
Oh shoot, this is a seed
Send the naming scheme you desire. Is long time since epoch ok? Or a
composite name of time since epoch + (something else)
Dean
From: Bill Hastings bllhasti...@gmail.commailto:bllhasti...@gmail.com
Reply-To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
NREL has released their open source databus. They spin it as energy data (and
a system for campus energy/building energy) but it is very general right now
and probably will stay pretty general. More information can be found here
http://www.nrel.gov/analysis/databus/
The source code can be
For unit testing, we actually use PlayOrm which has an in-memory version of
nosql so we just write unit tests against our code which uses the in-memory
version but that is only if you are in java.
Later,
Dean
From: Shahab Yunus shahab.yu...@gmail.commailto:shahab.yu...@gmail.com
Reply-To:
My bet is 5MB is the low end since many people go with the default. We upped
it to 10MB as at that time no one knew of what size was a good size to be and
the default was only 5MB.
Dean
From: Franc Carter franc.car...@sirca.org.aumailto:franc.car...@sirca.org.au
Reply-To:
are
using cassandra for and how it's working for you.
I'm a software engineer at Quantcast and we're just beginning to use
cassandra.
So far it's been great, but there's still a lot to learn in this space.
See you at the conference, hopefully!
Faraaz
On Fri, Jun 07, 2013 at 01:15:08PM -0700, Hiller
I would not mind meeting people there. My cell is 303-517-8902, best to text
me probably or just email me at d...@alvazan.com.
Later,
Dean
What happens when you use CL=TWO.
Dean
From: srmore comom...@gmail.commailto:comom...@gmail.com
Reply-To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
user@cassandra.apache.orgmailto:user@cassandra.apache.org
Date: Monday, June 3, 2013 2:09 PM
To:
Also, we had to put a fix into cassandra so it removed slow nodes from the
list of nodes to read from. With that fix our QUOROM(not local quorom) started
working again and would easily take the other DC nodes out of the list of
reading from for you as well. I need to circle back to with my
PM, Hiller, Dean
dean.hil...@nrel.govmailto:dean.hil...@nrel.gov wrote:
Also, we had to put a fix into cassandra so it removed slow nodes from the
list of nodes to read from. With that fix our QUOROM(not local quorom) started
working again and would easily take the other DC nodes out
Another option is not having it part of the primary key and using PlayOrm to
query but to succeed and scale, you would need to also use PlayOrm partitions
and then you can query in the partition and sort stuff.
Dean
From: Daniel Morton dan...@djmorton.commailto:dan...@djmorton.com
Reply-To:
Nope, partitioning is done per CF in PlayOrm.
Dean
From: cem cayiro...@gmail.commailto:cayiro...@gmail.com
Reply-To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
user@cassandra.apache.orgmailto:user@cassandra.apache.org
Date: Wednesday, May 29, 2013 10:01 AM
To:
such that we could be running 10 compactions in parallel.
QUESTION: I am assuming 10 compactions should be enough to put enough load
on the disk/cpu/ram etc. etc. or do you think I should go with 100CF's.
98% of our data is all in this one CF.
Thanks,
Dean
On 5/29/13 10:06 AM, Hiller, Dean dean.hil
We recently ran into too much data in one CF because LCS can't really run in
parallel on one CF in a single tier which got me thinking, why doesn't the CF
directoy have 100 or 1000 directories 0-999 and cassandra hash the key to which
directory it would go in and then put it in one of the
2013 17:49, Hiller, Dean
dean.hil...@nrel.govmailto:dean.hil...@nrel.gov wrote:
We recently ran into too much data in one CF because LCS can't really run in
parallel on one CF in a single tier which got me thinking, why doesn't the CF
directoy have 100 or 1000 directories 0-999 and cassandra hash
. Thanks!
On Tue, May 28, 2013 at 11:39 AM, Hiller, Dean dean.hil...@nrel.gov
wrote:
Another option is joins on partitions to keep the number of stuff
needing
to join relatively small. PlayOrm actually supports joins of partition
1
of table A with partition X of table B. You then just keep
I was assuming my node a1 would always own token 0, but we just added 5 of 6
more nodes and a1 no longer owns that token range.
I have a few questions on the table at the bottom
1. Is this supposed to happen where host a1 no longer owns token range 0(but
that is in his cassandra.yaml file),
and the data exists on nodes a2, a3, and a4 but not on a1.
You can see us inserting node a7 between a1 and a2, and inserting node a8
between node a2 and a3, etc. etc.
Thanks,
Dean
On 5/28/13 8:46 AM, Hiller, Dean dean.hil...@nrel.gov wrote:
I was assuming my node a1 would always own token 0
Another option is joins on partitions to keep the number of stuff needing
to join relatively small. PlayOrm actually supports joins of partition 1
of table A with partition X of table B. You then just keep the number of
rows in each partition at less than millions and you can filter with the
Don't do any delete != need to free the disk space after retention period
which you have in both your emails. My understanding is TTL is an expiry and
just like tombstones will only be really deleted upon a compaction(ie. You do
have deletes via TTL from the sound of it). If you have TTL of 1
You said compaction can't keep up. Are you manually running compaction all the
time or just letting cassandra kick off compactions when needed? Is compaction
always 100% running or are you saying your disk is growing faster than you like
and would like compactions to be always 100% running?
Also, how many nodes are you running?
From: cem cayiro...@gmail.commailto:cayiro...@gmail.com
Reply-To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
user@cassandra.apache.orgmailto:user@cassandra.apache.org
Date: Tuesday, May 28, 2013 1:17 PM
To:
.
Cem.
On Tue, May 28, 2013 at 9:37 PM, Hiller, Dean
dean.hil...@nrel.govmailto:dean.hil...@nrel.gov wrote:
Also, how many nodes are you running?
From: cem
cayiro...@gmail.commailto:cayiro...@gmail.commailto:cayiro...@gmail.commailto:cayiro...@gmail.com
Reply-To:
user
-
From: Hiller, Dean [mailto:dean.hil...@nrel.gov]
Sent: Tuesday, May 28, 2013 1:10 PM
To: user@cassandra.apache.org
Subject: Re: data clean up problem
How much disk used on each node? We run the suggested 300G per node as
above that compactions can have trouble keeping up.
Ps. We run compactions
Oh and yes, astyanax uses client side response latency and cassandra does
the same as a client of the other nodes.
Dean
On 5/28/13 2:23 PM, Hiller, Dean dean.hil...@nrel.gov wrote:
Actually, we did a huge investigation into this on astyanax and cassandra.
Astyanax if I remember worked
Wide rows, dynamic columns are still possible in CQL3. There are some links
here http://comments.gmane.org/gmane.comp.db.cassandra.user/30321
Also, there are other advantages to noSQL, not just schemaless aspect such as
that it can accept tons of writes and you can scale the writes(you can't
:
What kind of error does the other end of streaming(/10.10.42.36) say?
On Wed, May 22, 2013 at 5:19 PM, Hiller, Dean dean.hil...@nrel.gov
wrote:
We had 3 nodes roll on good and the next 2, we see a remote node with
this exception every time we start over and bootstrap the node
ERROR [Streaming
For anyone else that might be interested, when the stream hangs, there is no
exceptions around that time frame as to what exactly happened and why it
hung(there is an exception just not informative at all). We did find other
exceptions that we thought were unrelated though days before. We
, May 24, 2013 at 6:56 AM, Hiller, Dean dean.hil...@nrel.gov
wrote:
The exception on that node was just this
ERROR [Thread-6056] 2013-05-22 14:47:59,416 CassandraDaemon.java (line
132) Exception in thread Thread[Thread-6056,5,main]
java.lang.IndexOutOfBoundsException
I seem to remember problems with ghost nodes, etc. and I seem to remember if
you are replacing a node and you don’t use the same ip, this can cause issues.
Is this correct?
We would like the new node to keep the same token, and the same host name but
are wondering if we can change the ip
Well, if you just want to lower your I/O util %, you could always just add more
nodes to the cluster ;).
Dean
From: Igor i...@4friends.od.uamailto:i...@4friends.od.ua
Reply-To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
user@cassandra.apache.orgmailto:user@cassandra.apache.org
If you are only running repair on one node, should it not skip that node? So
there should be no performance hit except when doing CL_ALL of course. We had
to make a change to cassandra or slow nodes did impact us previously.
Dean
From: Wei Zhu wz1...@yahoo.commailto:wz1...@yahoo.com
We had 3 nodes roll on good and the next 2, we see a remote node with this
exception every time we start over and bootstrap the node
ERROR [Streaming to /10.10.42.36:2] 2013-05-22 14:47:59,404
CassandraDaemon.java (line 132) Exception in thread Thread[Streaming to
/10.10.42.36:2,5,main]
We are using 1.2.2 cassandra and have rolled on 3 additionals nodes to our 6
node cluster(totalling 9 so far). We are trying to roll on node 10 but during
the streaming a compaction kicked off which seemed very odd to us. nodetool
netstats still reported tons of files that were not
://www.tomas.cat/blog/en/monitoring-cassandra-relevant-data-should-be-watched-and-how-send-it-graphite
2013/5/13 Hiller, Dean dean.hil...@nrel.govmailto:dean.hil...@nrel.gov
We running a pretty consistent load on our cluster and added a new node to a 6
node cluster Friday(QA worked great, but production
We had to roll out a fix in cassandra as a slow node was slowing down our
clients of cassandra in 1.2.2 for some reason. Every time we had a slow node,
we found out fast as performance degraded. We tested this in QA and had the
same issue. This means a repair made that node slow which made
in the data
distribution ?
Did it settle down ?
Cheers
-
Aaron Morton
Freelance Cassandra Consultant
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 14/05/2013, at 5:06 AM, Hiller, Dean
dean.hil...@nrel.govmailto:dean.hil...@nrel.gov wrote:
Ah, okay iostat -x NEEDS
We running a pretty consistent load on our cluster and added a new node to a 6
node cluster Friday(QA worked great, but production not so much). One mistake
that was made was starting up the new node, then disabling the firewall :(
which allowed nodes to discover it BEFORE the node
nodetool
compactionstats
Any reason why cassandra might be reading a lot from the data disks(not
the commit log disk) more than usual?
Thanks,
Dean
On 5/13/13 10:46 AM, Hiller, Dean dean.hil...@nrel.gov wrote:
We running a pretty consistent load on our cluster and added a new node
to a 6 node cluster
nodetool describering {keyspace}
From: Kanwar Sangha kan...@mavenir.commailto:kan...@mavenir.com
Reply-To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
user@cassandra.apache.orgmailto:user@cassandra.apache.org
Date: Wednesday, May 8, 2013 3:00 PM
To:
We use PlayOrm to do 60,000 different streams which are all time series and use
the virtual column families of PlayOrm so they are all in one column family.
We then partition by time as well. I don't believe that we really have any
hotspots from what I can tell.
Dean
From: Keith Wright
,
event_id UUID,
app_id INT,
event_time TIMESTAMP,
user_id INT,
Š.
PRIMARY KEY (hour, event_time, event_id)
) WITH CLUSTERING ORDER BY (event_time desc);
Is this what others are doing?
On 5/7/13 4:18 PM, Hiller, Dean dean.hil...@nrel.gov wrote:
We use PlayOrm to do 60,000
I was under the impression that it is multiple requests using a single
connectin PARALLEL not serial as they have request ids and the responses do as
well so you can send a request while a previous request has no response just
yet.
I think you do get a big speed advantage from the asynchronous
without actual benchmarks to back them up. I do
completely agree that Async interfaces have their place and have certain
advantages over multi-threading models, but it's just another tool to be used
when appropriate.
Just my .02. :)
On Mon, May 6, 2013 at 5:08 AM, Hiller, Dean
dean.hil
Another option may be virtual column families with PlayOrm. We currently
do around 60,000 column families to store data from 60,000 different
sensors that keep feeding us information.
Dean
On 5/6/13 11:18 AM, Robert Coli rc...@eventbrite.com wrote:
On Sun, May 5, 2013 at 11:37 PM, Darren
PlayOrm now supports mongodb and cassandra with a query language that is
portable across both systems as well.
https://github.com/deanhiller/playorm
Later,
Dean
Well, it depends more on what you will do with the data. I know I was on a
sybase(RDBMS) with 1 billion rows but it was getting close to not being able to
handle more (constraints had to be turned off and all sorts of optimizations
done and expert consultants brought in and everything).
BUT
Nodes ?
Can i virtualize these two Nodes ?
Thx a lot for your assistance.
Marc
2013/4/26 Hiller, Dean dean.hil...@nrel.govmailto:dean.hil...@nrel.gov
Well, it depends more on what you will do with the data. I know I was on a
sybase(RDBMS) with 1 billion rows but it was getting close
I was wondering about the compactionthroughput. I never see ours get even
close to 16MB and I thought this is supposed to throttle compaction, right?
Ours is constantly less than 3MB/sec from looking at our logs or do I have this
totally wrong? How can I see the real throughput so that I can
. In those cases it may actually throttle something.
On Wed, Apr 24, 2013 at 3:54 PM, Hiller, Dean
dean.hil...@nrel.govmailto:dean.hil...@nrel.gov wrote:
I was wondering about the compactionthroughput. I never see ours get even
close to 16MB and I thought this is supposed to throttle compaction
@cassandra.apache.org
user@cassandra.apache.orgmailto:user@cassandra.apache.org
Subject: Re: Prepared Statement - cache duration (CQL3 - Cassandra 1.2.4)
On Tue, Apr 23, 2013 at 6:02 PM, Hiller, Dean
dean.hil...@nrel.govmailto:dean.hil...@nrel.gov wrote:
Out of curiosity, why did cassandra choose
We went from 1.1.4 to 1.2.2 and in QA rolling restart failed but in production
and QA bringing down the whole cluster upgrading every node and then bringing
it back up worked fine. We left ours at randompartitioner and had LCS as well.
We did not convert to Vnodes at all. Don't know if it
: Hiller, Dean dean.hil...@nrel.govmailto:dean.hil...@nrel.gov
To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
user@cassandra.apache.orgmailto:user@cassandra.apache.org; Wei Zhu
wz1...@yahoo.commailto:wz1...@yahoo.com
Sent: Tuesday, April 23, 2013 11:17 AM
Subject: Re: move data from
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