Re: Facebook Cassandra

As it relates to c* http://www.cs.cornell.edu/Projects/ladis2009/papers/Lakshman-ladis2009.PDF We have built, implemented, and operated a storage sys- tem providing scalability, high performance, and wide appli- cability. We have empirically demonstrated that Cassandra can support a very high upd

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Hi, I have a small cluster of 1.2.6 and after some config changes I started seeing errors int the logs. Not sure that's related, but the changes I performed were to disable hinted handoff and disable auto snapshot. I'll try to reverte these, see if the picture changes. But anyway, that seems like

AssertionError: DecoratedKey(... ) != DecoratedKey (...)

Pardon me, now with the appropriate subject line... Hi, I have a small cluster of 1.2.6 and after some config changes I started seeing errors int the logs. Not sure that's related, but the changes I performed were to disable hinted handoff and disable auto snapshot. I'll try to reverte these, see

com.datastax.driver.core.exceptions.WriteTimeoutException: Cassandra timeout during write query

Hi all, when using the java-driver I see this error on the client, for reads (as well as for writes). Many of the ops succeed, however I do see a significant amount of errors. com.datastax.driver.core.exceptions.WriteTimeoutException: Cassandra timeout during write query at consistency ONE (1 repl

Re: AssertionError: DecoratedKey(... ) != DecoratedKey (...)

Update: I've reverted hinted_handoff_enabled back to its default value of true and the errors stopped. Is this just a coincidence, or could be related? On Sun, Oct 6, 2013 at 7:23 PM, Ran Tavory wrote: > Pardon me, now with the appropriate subject line... > > Hi, I have a small cluster of 1.2.

Question about info returned from 'nodetool gossipinfo'

Hi, Does anyone know what the information that comes from the "nodetool gossipinfo" command means? For example, what is the LOAD #'s meaning or the SEVERITY #? My load is 91457.0 and SEVERITY: 22.448. Also, next to STATUS:NORMAL is a negative #: -123311655 what does that # mean?

DELETE does not delete :)

Hi all, We have encountered the following problem with cassandra. * We use *cassandra v2.0.0* from *Datastax* community repo. * We have *3 nodes* in a cluster, all of them are seed providers. * We have a *single keyspace* with *replication factor = 3*: *CREATE KEYSPACE bof WITH replication = {

Re: DELETE does not delete :)

W dniu 07.10.2013 08:02, Alexander Shutyaev pisze: * We have not modified any *consistency settings* in our app, so I assume we have the *default QUORUM* (2 out of 3 in our case) consistency *for reads and writes*. cqlsh uses ONE by default, pycassa uses ONE by default too. I have no experienc

Re: DELETE does not delete :)

Hi my two cents - before doing anything else, make sure clocks are synchronized to the millisecond. ntp will do so. Nick. On Mon, Oct 7, 2013 at 9:02 AM, Alexander Shutyaev wrote: > Hi all, > > We have encountered the following problem with cassandra. > > * We use *cassandra v2.0.0* from *Data

Re: Question about info returned from 'nodetool gossipinfo'

the output of "nodetool gossipinfo" are the application states of each endpoint/node in the cluster that are exchanged b/w the nodes during gossiping. "Severity" is basically a measure of compaction activity/events in a node ( see https://issues.apache.org/jira/browse/CASSANDRA-3722 for the det

Re: DELETE does not delete :)

Hi Nick, Thanks for the note! We have our cassanra instances installed on virtual hosts in VMWare and the clock synchronization is handled by the latter, so I can't use ntpdate (says that NTP socket is in use). Is there any way to check if the clocks are really synchronized? My best attempt was us

CASSANDRA MAPREDUCE OTHER TYPE COLUMNS

hii.. can some body please tell me how to select a column of type int or float and print that column value in cassandra mapreduce? every thing I read is about reading a String column form cassandra and print the values..