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commit log question

Hello,    I have one question about the 'commit log' in Cassandra, so imagine we issue a write with QUORUM, if the write was successful then we are sure that N/2 +1 replicas have the new data. If one of these replicas fail, no state is lost because the state is also available from another machine i

Re: Cassandra thrift question

t; > 2010/5/21 Даниел Симеонов : > > Hi, > >I have a question about the thrift protocol used to connect to > Cassandra, > > I saw in class CassandraDaemon that TServerSocket is being used, > > why TNonblockingServerSocket is not being used? Than

Cassandra thrift question

Hi, I have a question about the thrift protocol used to connect to Cassandra, I saw in class CassandraDaemon that TServerSocket is being used, why TNonblockingServerSocket is not being used? Thank you very much! Best regards, Daniel.

Re: busy thread on IncomingStreamReader ?

Hi, I've experienced the same problem, two nodes got stuck with CPU at 99% and the following source code from IncomingStreamReader class: while (bytesRead < pendingFile.getExpectedBytes()) { bytesRead += fc.transferFrom(socketChannel, bytesRead, FileStreamTask.CHUNK_SIZE);

Re: eventuality

Hi, You are right, but I have the feeling that this is a different use cases, i.e. we have a happy case (eventuality when everything is up and working) and not so happy one to say. Best regards, Daniel. 2010/5/5 Peter Schüller > >I have one question about the eventuality, i.e. do you know

eventuality

Hi, I have one question about the eventuality, i.e. do you know what are the variables from which it depends. Well the most obvoius is the ConsistencyLevel, so lets assume it is set to ONE. The question is that the eventuallity is the relative time to spread changes across the cassandra nodes. I

Re: Best way to store millisecond-accurate data

s not part of > its design. > > In practice, one would want to model their data such that the 'row has too > much columns' scenario is prevented. > > On May 4, 2010, at 8:06 AM, Даниел Симеонов wrote: > > Hi Miguel, > I'd like to ask is it possible to have runti

Re: Best way to store millisecond-accurate data

Hi Miguel, I'd like to ask is it possible to have runtime sharding or rows in cassandra, i.e. if the row has too much new columns inserted then create another one row (let's say if the original timesharding is one day per row, then we would have two rows for that day). Maybe batch processes could

Re: inserting new rows with one key vs. inserting new columns in a row performance

Hello, It seems that I have experienced network problems (local pre-installed firewall) and some rest http inefficiencies, so I think that it behaves the same in both cases. I am sorry to have taken from your time. Best regards, Daniel. На 30 април 2010 20:46, Даниел Симеонов написа: >

inserting new rows with one key vs. inserting new columns in a row performance

Hi, I've checked two similar scenarios and one of them seem to be more performant. So timestamped data is being appended, the first use case is with an OPP and new rows being created every with only one column (there are about 7-8 CFs). The second cases is to have rows with more columns and Rand

Re: question about how columns are deserialized in memory

all columns in memory? Best regards, Daniel. 2010/4/28 Sylvain Lebresne > 2010/4/28 Даниел Симеонов : > > Hi Sylvain, > > Thank you very much! I still have some further questions, I didn't find > > how row cache is being configured? > > Provided you don'

Re: question about how columns are deserialized in memory

/4/28 Sylvain Lebresne > 2010/4/28 Даниел Симеонов : > > Hi, > >I have a question about if a row in a Column Family has only columns > > whether all of the columns are deserialized in memory if you need any of > > them? As I understood it is the case, > > No it&#

question about how columns are deserialized in memory

Hi, I have a question about if a row in a Column Family has only columns whether all of the columns are deserialized in memory if you need any of them? As I understood it is the case, and if the Column Family is super Column Family, then only the Super Column (entire) is brought up in memory? Wh

Re: questions about consistency

about implementation of counters, currently it seems it is not implementable in 'Cassandra', will the vector clocks help here? Do you have experiences with counters in Cassandra? Best regards, Daniel. 2010/4/21 Paul Prescod > I'm not an expert, so take what I say with a grain of sal

Re: questions about consistency

grain of salt. > > 2010/4/21 Даниел Симеонов : > > Hello, > >I am pretty new to Cassandra and I have some questions, they may seem > > trivial, but still I am pretty new to the subject. First is about the > lack > > of a compareAndSet() operation, as I understood

questions about consistency

Hello, I am pretty new to Cassandra and I have some questions, they may seem trivial, but still I am pretty new to the subject. First is about the lack of a compareAndSet() operation, as I understood it is not supported currently in Cassandra, do you know of use cases which really require such o