tion updates, if so the
answer is no.
Cheers
-
Aaron Morton
Freelance Cassandra Consultant
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 10/04/2013, at 3:26 AM, DE VITO Dominique
wrote:
> When the coordinator node receives a batch_mutate for __one__ row key
>
> b) the "batch_mutate" advantages are better, for the communication
> "client<=>coordinator node" __and__ for the communications "coordinator
> node<=>replicas".
Yes. A single row mutation can write to many CFs.
> Is there any expe
When the coordinator node receives a batch_mutate for __one__ row key
associated with different mutations for different CF :
Is it true the coordinator node treats them as __independent__
communications/requests to replicas (even if in that case, the replicas are the
same for every request
Thanks Aaron.
It helped.
Let's me rephrase a little bit my questions. It's about data modeling impact on
"batch_mutate" advantages.
I have one CF for storing data, and ~10 (all different) CF used for indexing
that data.
when adding a piece of data, I need to add indexes t
g CF could be:
> rowkey = folder_id
> colname = (indexed value, timestamp, file_id)
> colvalue = ""
>
> Alternative design :
> * pro: same rowkey for all indexing CF => **all** indexing CF could be
> updated through one batch_mutate
> * con: repeating &q
e design for indexing CF could be:
rowkey = folder_id
colname = (indexed value, timestamp, file_id)
colvalue = ""
Alternative design :
* pro: same rowkey for all indexing CF => **all** indexing CF could be updated
through one batch_mutate
* con: repeating "indexed value"
ives a batch_mutate with different N row keys
> (for different CF) :
>
> a) does it treat them as N independent requests to replicas, or
>
> b) does the coordinator node split the the initial batch_mutate into M
> batch_mutate (M <= N) according to rowkeys ?
>
> Thanks,
When the coordinator node receives a batch_mutate with different N row keys
(for different CF) :
a) does it treat them as N independent requests to replicas, or
b) does the coordinator node split the the initial batch_mutate into M
batch_mutate (M <= N) according to rowkeys ?
Tha
thub.com/pycassa/pycassa/blob/master/pycassa/batch.py#L113
>>
>>
>> On Sat, Sep 22, 2012 at 12:22 AM, Bradford Toney <
>> bradford.to...@gmail.com> wrote:
>>
>>> I was using batch_mutate through the thrift interface and kept getting
>>> supercol
t;
> and in pycassa:
> https://github.com/pycassa/pycassa/blob/master/pycassa/batch.py#L113
>
>
> On Sat, Sep 22, 2012 at 12:22 AM, Bradford Toney > wrote:
>
>> I was using batch_mutate through the thrift interface and kept getting
>> supercolumn errors, I was won
cassa/Batch/Mutator.php#L53
and in pycassa:
https://github.com/pycassa/pycassa/blob/master/pycassa/batch.py#L113
On Sat, Sep 22, 2012 at 12:22 AM, Bradford Toney
wrote:
> I was using batch_mutate through the thrift interface and kept getting
> supercolumn errors, I was wondering if there are a
no right it's ok, it was a bug on my side
2012/8/11 Tyler Hobbs
>
>
> On Thu, Aug 9, 2012 at 10:43 AM, Cyril Auburtin
> wrote:
>
>> It seems the Thrift method *batch-mutate*, with Mutations, will not
>> update the previous data with the mutation given, but clear and replace by
>> it? right?
>>
On Thu, Aug 9, 2012 at 10:43 AM, Cyril Auburtin wrote:
> It seems the Thrift method *batch-mutate*, with Mutations, will not
> update the previous data with the mutation given, but clear and replace by
> it? right?
>
I'm not sure what you're asking. Writes in Cassandra are always blind
overwrite
Hello
It seems the Thrift method *batch-mutate*, with Mutations, will not update
the previous data with the mutation given, but clear and replace by it?
right?
thanks for answers
How could I do if I have more than one field to update, I should send
several thrft *insert*?
> particular node, that node accepting READ+WRITE request from the clients
> and
> giving below exceptions.
>
> 2012-07-30 23:08:18,169 ERROR [Cassandra$Processor] Internal error
> processing batch_mutate
> java.util.concurrent.RejectedExecutionException: ThreadPoolE
] Internal error
processing batch_mutate
java.util.concurrent.RejectedExecutionException: ThreadPoolExecutor has shut
down
at
org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor$1.rejectedExecution(DebuggableThreadPoolExecutor.java:60)
at
ursday, July 05, 2012 10:39 AM
> To: 'user@cassandra.apache.org'
> Subject: batch_mutate
>
> My current way of inserting rows one by one is too slow (I use cql3 prepared
> statements) , so I want to try batch_mutate.
>
> Could anybody give me more details about t
update multiple column families using the same key? Shouldn't we design our
space in such a way that those columns live in the same column family?
From: Leonid Ilyevsky [mailto:lilyev...@mooncapital.com]
Sent: Thursday, July 05, 2012 10:39 AM
To: 'user@cassandra.apache.org'
Subject: b
My current way of inserting rows one by one is too slow (I use cql3 prepared
statements) , so I want to try batch_mutate.
Could anybody give me more details about the interface? In the javadoc it says:
public void
batch_mutate(java.util.Map>>>
mut
message in error, please contact the sender immediately and irrevocably delete
this message and any copies.
From: aaron morton [mailto:aa...@thelastpickle.com]
Sent: Monday, February 06, 2012 21:03
To: user@cassandra.apache.org
Subject: Re: Internal error proce
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 4/02/2012, at 4:49 AM, Viktor Jevdokimov wrote:
> What may be cause of the following exception in 1.0.7 Cassandra:
>
> ERROR [Thrift:134] 2012-02-03 15:51:02,800 Cassandra.java (line 3462)
> Internal error processing
What may be cause of the following exception in 1.0.7 Cassandra:
ERROR [Thrift:134] 2012-02-03 15:51:02,800 Cassandra.java (line 3462) Internal
error processing batch_mutate
java.util.ConcurrentModificationException
at
java.util.AbstractList$Itr.checkForComodification(AbstractList.java
ched is set
>> to 1.0). I am wondering if TTL values also follow gc_grace? If they
>> do, am I correct in thinking it would be best to set gc_grace really
>> low in this case? (zero?)
>>
>> Another question:
>> For a single key I have data in ColumnFamily "CF_A
"CF_A" and ColumnFamily
> "CF_B". I set their data in one thrift "batch_mutate".
> If I understood correctly, atomicity is then guaranteed (if one
> mutation fails, they all fail). But isolation is not. However if for
> example the following Mutation
case? (zero?)
Another question:
For a single key I have data in ColumnFamily "CF_A" and ColumnFamily
"CF_B". I set their data in one thrift "batch_mutate".
If I understood correctly, atomicity is then guaranteed (if one
mutation fails, they all fail). But isolation is n
Sure is: scale7-pelops-1.1-0.7.x-20110418.225848-3.jar
Cheers,
--
Dan Washusen
On Tuesday, 19 April 2011 at 3:58 PM, Héctor Izquierdo Seliva wrote:
> Thanks Dan for fixing that! Is the change integrated in the latest maven
> snapshot?
>
> El mar, 19-04-2011 a las 10:48 +1000, Dan Washusen escri
Thanks Dan for fixing that! Is the change integrated in the latest maven
snapshot?
El mar, 19-04-2011 a las 10:48 +1000, Dan Washusen escribió:
> An example scenario (that is now fixed in Pelops):
> 1. Attempt to write a column with a null value
> 2. Cassandra throws a TProtocolException
An example scenario (that is now fixed in Pelops):
Attempt to write a column with a null value
Cassandra throws a TProtocolException which renders the connection useless for
future operations
Pelops returns the corrupt connection to the pool
A second read operation is attempted with the corrupt co
Any idea what's causing the original TPE?
On Mon, Apr 18, 2011 at 6:22 PM, Dan Washusen wrote:
> It turns out that once a TProtocolException is thrown from Cassandra the
> connection is useless for future operations. Pelops was closing connections
> when it detected TimedOutException, TTransportE
It turns out that once a TProtocolException is thrown from Cassandra the
connection is useless for future operations. Pelops was closing connections
when it detected TimedOutException, TTransportException and
UnavailableException but not TProtocolException. We have now changed Pelops to
close c
I've looked over the Pelops code again and I really can't see how it could be
at fault here...
--
Dan Washusen
On Wednesday, 13 April 2011 at 3:20 AM, Stephen McKamey wrote:
> [I wrote this Apr 10, 2011 at 12:09 but my message seems to have gotten lost
> along the way.]
>
> I use Pelops (the
[I wrote this Apr 10, 2011 at 12:09 but my message seems to have gotten lost
along the way.]
I use Pelops (the 1.0-0.7.x build from the Github Maven repo) and have
occasionally seen this message (under load or during GC). I have a test app
running in two separate single-threaded processes doing a
Pelops uses a single connection per operation from a pool that is backed by
Apache Commons Pool (assuming you're using Cassandra 0.7). I'm not saying it's
perfect but it's NOT sharing a connection over multiple threads.
Dan Hendry mentioned that he sees these errors. Is he also using Pelops? Fro
El mié, 06-04-2011 a las 21:04 -0500, Jonathan Ellis escribió:
> "out of sequence response" is thrift's way of saying "I got a response
> for request Y when I expected request X."
>
> my money is on using a single connection from multiple threads. don't do
> that.
>
I'm not using thrift direct
El mié, 06-04-2011 a las 21:04 -0500, Jonathan Ellis escribió:
> "out of sequence response" is thrift's way of saying "I got a response
> for request Y when I expected request X."
>
> my money is on using a single connection from multiple threads. don't do
> that.
I'm not using thrift direc
vide more info please?
>
> org.scale7.cassandra.pelops.exceptions.ApplicationException:
> batch_mutate failed: out of sequence response
>
> --
> Dan Washusen
> Make big files fly
> visit digitalpigeon.com
>
> On Tuesday, 5 April 2011 at 11:43 PM, Héctor Izquierdo Seliva wr
> org.scale7.cassandra.pelops.exceptions.ApplicationException:
> batch_mutate failed: out of sequence response
>
> > --
> > Dan Washusen
> > Make big files fly
> > visit digitalpigeon.com
> >
> > On Tuesday, 5 April 2011 at 11:43 PM, Héctor Izquierdo Seliva wrote:
> >
El mié, 06-04-2011 a las 09:18 +0200, Héctor Izquierdo Seliva escribió:
> I took a look at vmstats, and there was no swap. Also, our monitoring
> tools showed no swap being used at all. It's running with mlockall and
> all that. 8GB heap on a 16GB machine
>
I tried disabling swap completely, and
El mié, 06-04-2011 a las 09:06 +1000, Dan Washusen escribió:
> Pelops raises a RuntimeException? Can you provide more info please?
>
org.scale7.cassandra.pelops.exceptions.ApplicationException:
batch_mutate failed: out of sequence response
> --
> Dan Washusen
> Make big fi
I took a look at vmstats, and there was no swap. Also, our monitoring
tools showed no swap being used at all. It's running with mlockall and
all that. 8GB heap on a 16GB machine
El mar, 05-04-2011 a las 21:24 +0200, Peter Schuller escribió:
> > Would you recommend to disable system swap as a rule?
our response!
>
> Héctor
>
> > -Original Message-
> > From: Héctor Izquierdo Seliva [mailto:izquie...@strands.com]
> > Sent: April-05-11 8:30
> > To: user@cassandra.apache.org
> > Subject: batch_mutate failed: out of sequence response
> >
> > Hi
> Would you recommend to disable system swap as a rule? I'm running on Debian
> 64bit and am seeing light swapping:
I'm not Jonathan, but *yes*. I would go so far as to say that
disabling swap is a good rule of thumb for *most* production systems
that serve latency sensitive traffic. For a mach
round 5 seconds. I'm running cassandra with a heap of 8 GB. Should I tune
>> this somehow?
>>
>> Is any of this wrong?
>>>
>>>>> -Original Message-
>>>>> From: Héctor Izquierdo Seliva [mailto:izquie...@strands.com]
>>>
---Original Message-
>> > > From: Héctor Izquierdo Seliva [mailto:izquie...@strands.com]
>> > > Sent: April-05-11 8:30
>> > > To: user@cassandra.apache.org
>> > > Subject: batch_mutate failed: out of sequence response
>> > >
>> > > Hi e
t: April-05-11 8:30
> > > To: user@cassandra.apache.org
> > > Subject: batch_mutate failed: out of sequence response
> > >
> > > Hi everyone. I'm having trouble while inserting big amounts of data into
> > > cassandra. I'm getting this exception:
>
> -Original Message-
> > From: Héctor Izquierdo Seliva [mailto:izquie...@strands.com]
> > Sent: April-05-11 8:30
> > To: user@cassandra.apache.org
> > Subject: batch_mutate failed: out of sequence response
> >
> > Hi everyone. I'm having trouble while
your response!
Héctor
> -Original Message-
> From: Héctor Izquierdo Seliva [mailto:izquie...@strands.com]
> Sent: April-05-11 8:30
> To: user@cassandra.apache.org
> Subject: batch_mutate failed: out of sequence response
>
> Hi everyone. I'm having trouble while
age/xc3tskhhvsf5awz7). What OS are you running?
Dan
-Original Message-
From: Héctor Izquierdo Seliva [mailto:izquie...@strands.com]
Sent: April-05-11 8:30
To: user@cassandra.apache.org
Subject: batch_mutate failed: out of sequence response
Hi everyone. I'm having trouble while inserting big am
Hi everyone. I'm having trouble while inserting big amounts of data into
cassandra. I'm getting this exception:
batch_mutate failed: out of sequence response
I'm gessing is due to very big mutates. I have made the batch mutates
smaller and it seems to be behaving. Can somebody
No, on 0.6 copying settings for a 32GB machine to a 16GB machine would
also be a great way to OOM. The difference is that you had to set
memtable thresholds globally in the xml file in 0.6, instead of being
able to do it per-columnfamily from the cli.
On Tue, Feb 8, 2011 at 10:40 AM, Chris Burrou
On 02/07/2011 06:05 PM, Jonathan Ellis wrote:
> Sounds like the keyspace was created on the 32GB machine, so it
> guessed memtable sizes that are too large when run on the 16GB one.
> Use "update column family" from the cli to cut the throughput and
> operations thresholds in half, or to 1/4 to be
On Tue, Feb 8, 2011 at 00:05, Jonathan Ellis wrote:
> Sounds like the keyspace was created on the 32GB machine, so it
> guessed memtable sizes that are too large when run on the 16GB one.
> Use "update column family" from the cli to cut the throughput and
> operations thresholds in half, or to 1/4
Sounds like the keyspace was created on the 32GB machine, so it
guessed memtable sizes that are too large when run on the 16GB one.
Use "update column family" from the cli to cut the throughput and
operations thresholds in half, or to 1/4 to be cautious.
On Mon, Feb 7, 2011 at 9:00 AM, Patrik Mode
On Mon, Feb 7, 2011 at 15:44, sridhar basam wrote:
> Looks like you don't have a big enough working set from your GC logs, there
> doesn't seem to be a lot being reclaimed in the GC process. The process is
> reclaiming a few hundred MB and is running every few seconds. How big are
> your caches? T
Looks like you don't have a big enough working set from your GC logs, there
doesn't seem to be a lot being reclaimed in the GC process. The process is
reclaiming a few hundred MB and is running every few seconds. How big are
your caches? The probable reason that it works the first couple times when
Just tried current 0.7.1 from cassandra-0.7 branch and it does the
same. OOM after three runs.
-Xm* setting is computed by cassandra-env.sh like this: -Xms8022M
-Xmx8022M -Xmn2005M
What am I doing wrong?
Thanks,
Patrik
On Mon, Feb 7, 2011 at 14:18, Patrik Modesto wrote:
> I forgot to mention
I forgot to mention I use 0.7.0 stable version.
HTH,
Patrik
Hi all!
I'm running into OOM problem during batch_mutate. I've a test cluster
of two servers, 32GB and 16GB RAM, real HW. I've one keyspace and one
CF with 1,4mil rows, each 10 columns. A row is around 5k in size. I
run Hadoop MR task that reads one column and generates Mutati
I'm a little confused about #3. Hopefully this clarifying question won't turn
the one maybe into a no :).
I'm fine not reading the latest data, as long as on each individual read I see
all or none of the operations that occurred for a single one row batch_mutate.
My concern
It's hard to tell without knowing the the nature of the data you're writing,
but you might want to think about whether you can embed any sort of version
number and/or checksum into the column names of the chunk columns. That
way, you could very easily determine that the data you wanted to retrieve
On Sat, Nov 27, 2010 at 10:12 AM, E S wrote:
> I'm trying to figure out the best way to achieve single row modification
> isolation for readers.
I have a lot of No's for you. :)
> As an example, I have 2 rows (1,2) with 2 columns (a,b). If I modify both
> rows,
> I don't care if the user sees
er 30, 2010 12:57:07 AM
Subject: Re: Achieving isolation on single row modifications with batch_mutate
In this case, it sounds like you should combine columns A and B if you
are writing them both at the same time, reading them both at the same
time, and need them to be consistent.
Obviously, you
In this case, it sounds like you should combine columns A and B if you
are writing them both at the same time, reading them both at the same
time, and need them to be consistent.
Obviously, you're probably dealing with more than two columns here, but
there's generally not any value in splitting so
Using batch_mutate on a single row will count as 1 write operation, even if
you mutate multiple columns. Using batch_mutate on N rows will count as N
write operations.
- Tyler
On Mon, Nov 29, 2010 at 5:58 PM, Narendra Sharma
wrote:
> Hi,
>
> I am using Cassandra 0.7 beta3 and Hect
Hi,
I am using Cassandra 0.7 beta3 and Hector.
I create a mutation map. The mutation involves adding few columns for a
given row. After that I use batch_mutate API to send the changes to
Cassandra.
Question:
If there are multiple column writes on same row in a mutation_map, does
Cassandra show
I'm trying to figure out the best way to achieve single row modification
isolation for readers.
As an example, I have 2 rows (1,2) with 2 columns (a,b). If I modify both
rows,
I don't care if the user sees the write operations completed on 1 and not on 2
for a short time period (seconds). I
Aaron
This did the trick - thanks.
From: aaron morton [mailto:aa...@thelastpickle.com]
Sent: Thursday, October 28, 2010 3:23 AM
To: user@cassandra.apache.org
Subject: Re: Question regarding support of batch_mutate + delete + slice
predicate
I cannot see anything in jira scheduled for
The main difficulty is that row mutations are currently represented
only in terms of individual columns. This has implications in the way
the transaction is carried out and represented in the commit log.
Introducing deletable slices is doable, but keeping it within the
semantics of column family o
It's unscheduled (https://issues.apache.org/jira/browse/CASSANDRA-494,
as you noted) because there's the obvious workaround of performing a
slice and then deleting each column in the slice. It could happen
during a 0.7 release since it wouldn't require API changes. 0.6 is
basically bugfix-only at
I cannot see anything in jira scheduled for 0.7 or 0.8 . Gary may be able to
shed some light on it.
There is a comment at the bottom of CASSANDRA-293 "Range operations cannot be
made to work with the existing implementation of hinted handoff. Further, they
were a bad fit for the transactional u
Investigation of this combination led to the following:
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/batch-m
utate-deletion-slice-range-predicate-unsupported-td5048309.html
Are there plans (6.x or 7) to support this?
Thanks
Thanks Gary and Jonathan. Yeah, I'm planning on switching to Hector sometime
soon;
I started with Thrift mostly because I wanted to see what was going on
underneath
the hood before using a higher-level interface. I suppose now is as good a
time to
switch as any.
Thanks,
Chris
On Mon, Oct 25, 2010
t; client.batch_mutate(keySpace, mutationMap, ConsistencyLevel.ONE);
> But in 0.7, batch_mutate no longer has a keyspace argument, so I used:
> client.batch_mutate(mutationMap, ConsistencyLevel.ONE);
> Not surprisingly, I got an error:
> InvalidRequestException(why:You have not set
client.set_keyspace()
On Mon, Oct 25, 2010 at 12:59, Chris Oei wrote:
> So, I'm a bit puzzled about how to change my old 0.6 code to 0.7.
> In 0.6, I used:
> client.batch_mutate(keySpace, mutationMap, ConsistencyLevel.ONE);
> But in 0.7, batch_mutate no longer has a keyspa
So, I'm a bit puzzled about how to change my old 0.6 code to 0.7.
In 0.6, I used:
client.batch_mutate(keySpace, mutationMap, ConsistencyLevel.ONE);
But in 0.7, batch_mutate no longer has a keyspace argument, so I used:
client.batch_mutate(mutationMap, ConsistencyLevel.ONE);
advise (both Jonathan and Aaron's) I was able to track the
> problem down. The issue was that running insert (also batch_mutate) and
> using a consistencylevel of quorum on a cluster of 1 server with a
> replication factor of 1 does not work. Well, that is not accurate, let me
> ex
Partially Resolved...
Taking your advise (both Jonathan and Aaron's) I was able to track the
problem down. The issue was that running insert (also batch_mutate) and
using a consistencylevel of quorum on a cluster of 1 server with a
replication factor of 1 does not work. Well, that i
would
> also
> > try the list. If you have any suggestions, please let me know
> >
> > I am working with Cassandra 0.6.5 using the thrift interface. I am trying
> to
> > use the batch_mutate method call, however, when I execute it, I receive
> no
> > error message
suggestions, please let me know
I am working with Cassandra 0.6.5 using the thrift interface. I am trying to use the batch_mutate method call, however, when I execute it, I receive no error message. This leads me to believe it worked. When I check using the CLI, there is nothing there. Is there
osted the following to Stackoverflow, but thought that I would also
> try the list. If you have any suggestions, please let me know
>
> I am working with Cassandra 0.6.5 using the thrift interface. I am trying to
> use the batch_mutate method call, however, when I execute it, I receive no
Hello all,
I have posted the following to Stackoverflow, but thought that I would also
try the list. If you have any suggestions, please let me know
I am working with Cassandra 0.6.5 using the thrift interface. I am trying to
use the batch_mutate method call, however, when I execute it, I
no
On Wed, Sep 1, 2010 at 7:34 PM, Terje Marthinussen
wrote:
> Hi,
>
> Just a curiosity. I should probably read some code and write a test to make
> sure, but not important enough right now for that :)
>
> void batch_mutate(string keyspace, map>> mutation_map, Consistenc
Hi,
Just a curiosity. I should probably read some code and write a test to make
sure, but not important enough right now for that :)
-
void batch_mutate(string keyspace,
map>> mutation_map, ConsistencyLevel
consistency_level)
Will performance of a batch_mutate be affected by the
i got the latest code from tip of trunk this morning, but i'm seeing
this. i recall a JIRA about this. maybe patch isn't on trunk?
ERROR [pool-1-thread-61] 2010-08-27 15:55:36,429 Cassandra.java (line
2980) Internal error processing batch_mutate
java.lang.NullPointerExcept
> I am using the familiar meanings from ACID:
>
> atomic means either the entire update will succeed or none of it.
>
> isolated means other threads will not see partial updates while it is
> being applied.
A related concern is whether there is a write *ordering* guarantee for
mutations within a r
>> isolated means other threads will not see partial updates while it is
>> being applied.
>
> yes, those terms are not new.
>
> it remains, that the answer with respect to isolation would be clearer were
> it expressed in terms of cassandra's operations. given the t
.
it remains, that the answer with respect to isolation would be
clearer were it expressed in terms of cassandra's operations. given
the two-level map passed to batch_mutate,
is it that another thread could see the effect of some mutation
object in one entry of the inner key map, but no
at 02:45 , Jonathan Ellis wrote:
>
>> Everything in the same key of a batch_mutate is atomic. (But not
>> isolated.)
>>
>
> what does the distinction mean in the context of cassandra?
> is it that the execution of an operation with the same key could see the
> ef
good morning;
On 2010-08-07, at 02:45 , Jonathan Ellis wrote:
Everything in the same key of a batch_mutate is atomic. (But not
isolated.)
what does the distinction mean in the context of cassandra?
is it that the execution of an operation with the same key could see
the effect of the
Everything in the same key of a batch_mutate is atomic. (But not isolated.)
On Fri, Aug 6, 2010 at 2:15 PM, B. Todd Burruss wrote:
> ok i just saw the FAQ
> (http://wiki.apache.org/cassandra/FAQ#batch_mutate_atomic)
>
> follow up question ...
>
> it states that "As a
in the same CF ... "
so if i have several mutatations against a single key, but multiple
column families i assume this is not atomic?
thx
On Fri, 2010-08-06 at 11:08 -0700, Todd Burruss wrote:
> if i am using batch_mutate to update/insert two columns in the same CF
> and same key, is this a
if i am using batch_mutate to update/insert two columns in the same CF
and same key, is this an atomic operation?
i understand that an operation on a single key in a CF is atomic, but
not sure if the above scenario boils down to two operations or
considered one operation.
thx
now i am confused about using the operation batch_mutate,when i follow the code
from
here:http://stackoverflow.com/questions/2783323/cassandra-batch-mutate/3137753#3137753
and it seems it has success inserted something,but when i use cassandra-cli to
check it,it just return nothing,
could
right.
in other words, you can delete entire rows w/ batch_mutate in 0.6.3 or
trunk, but for 0.6.2 the best workaround is to issue multiple remove
commands.
On Tue, Jun 22, 2010 at 5:09 AM, Mishail wrote:
> Take a look at
>
> https://issues.apache.org/jira/browse/CASSANDRA-494
.
> I use Cassandra 0.6.2 and coding in Java, using the native Java Thrift API.
>
> The way my application works, I need to delete multiple rows at a time
> (just like reads and writes).
> Obviously, in terms of performance, I'd rather use batch_mutate and
> delete several r
and writes).
Obviously, in terms of performance, I'd rather use batch_mutate and delete
several rows and not issue a remove command on each and every row.
So far, all attempts doing so have failed.
The following command configurations have been tested:
1. Deletion, without a Supercolumn or Sli
roundtrip of many update requests.
> Some may fail and some may succeed
>
> On Mon, Jun 14, 2010 at 2:40 PM, Per Olesen wrote:
>>
>> Can I expect batch_mutate to work in what I would think of as an atomic
>> operation?
>>
>> That either all the mutations in t
no, it's not atomic. it just shortens the roundtrip of many update requests.
Some may fail and some may succeed
On Mon, Jun 14, 2010 at 2:40 PM, Per Olesen wrote:
> Can I expect batch_mutate to work in what I would think of as an atomic
> operation?
>
> That either all the
Can I expect batch_mutate to work in what I would think of as an atomic
operation?
That either all the mutations in the batch_mutate call are executed or none of
them are? Or can some of them fail while some of them succeeds?
Hi,
>
> Just to clarify. Are you trying to insert a couple of columns with key
> "cache_pages" in the ColumnFamily "Page"?
>
> Moses Dinakaran wrote:
> i,
> >
> >
> >
> > I am trying to use batch_mutate() with PHP Thrift. I was getting the
> > following error.
> >
>
>
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