Thank for you replies. 1) I can not create raw each X time , since it will not allow me to get a complete list of currently active records ( this is the only reason i keep this raw initially ). 2) As for compaction i thought that only raw ids are cached and not columns itself. I have completed compaction and it indeed cleared most of data ( 75% of complete table ,and there are some other raws ). It looks like it did not cleared all the data from disk ( compaction should set table into single file , while other files still left ) , but showed in log that data cleared , also after compaction this raw became responsive.
Most of our data is wrotten once and kept in history , however we have also counter columns which are not working good ( had troubles with that ) and several places where we use create / delete approach.Now i understand why our data grows so much , it just does not clears old data at all , but marks it as tombstone... What NOSQL database would you recommend for such usages ( write onces read many mixed with counter columns mixed with read/write oftenly data)? Thanks and best regards Yulian Oifa On Mon, Apr 7, 2014 at 5:57 PM, Lukas Steiblys <lu...@doubledutch.me> wrote: > Deleting a column simply produces a tombstone for that column, as far > as I know. It's probably going through all the columns with tombstones and > timing out. Compacting more often should help, but maybe Cassandra isn't > the best choice overall for what you're trying to do. > > Lukas > > *From:* Yulian Oifa <oifa.yul...@gmail.com> > *Sent:* Sunday, April 6, 2014 11:54 AM > *To:* user@cassandra.apache.org > *Subject:* Transaction Timeout on get_count > > Hello > I am having raw in which approximately 100 values is written per minute. > Those columns are then deleted ( it contains active records list ). > When i am trying to execute get_count on that raw i get transaction > timeout , even while the raw is empty. > I dont see anything in cassandra log on neither node , pending tasks are > zero. > What could be a reason for that , and how can it be resolved? > Best regards > Yulian Oifa >
