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125 discussions - 612 posts

  • Hi, I have a serious problem with counters performance and I can't seem to figure it out. Basically I'm building a system for accumulating some statistics "on the fly" via Cassandra distributed ...
    Sergey OlefirSergey Olefir
    Nov 27, 2012 at 4:49 pm
    Nov 29, 2012 at 7:34 am
  • Neither really. Repair doesn't do any gcable tombstone collection and it would be really hard to change that (besides, it's not his job). So if you when you run repair there is sstable with tombstone ...
    Sylvain LebresneSylvain Lebresne
    Nov 1, 2012 at 8:43 am
    Nov 6, 2012 at 8:23 pm
  • Yes the row cache "could be" incorrect so on startup cassandra verify they saved row cache by re reading. It takes a long time so do not save a big row cache. jconsole. After saving cache, it is ...
    Edward CaprioloEdward Capriolo
    Nov 14, 2012 at 2:39 am
    Nov 19, 2012 at 12:17 am
  • we are having the problem where we have huge SSTABLEs with tombstoned data in them that is not being compacted soon enough (because size tiered compaction requires, by default, 4 like sized ...
    B. Todd BurrussB. Todd Burruss
    Nov 8, 2012 at 6:12 pm
    Nov 11, 2012 at 8:35 pm
  • Hi, I'm aware that this has been a frequent question, but answers are still hard to find: what's an appropriate Java high-level client? I actually believe that the lack of a single maintained Java ...
    Carsten SchnoberCarsten Schnober
    Nov 27, 2012 at 3:37 pm
    Nov 30, 2012 at 3:02 pm
  • Hello. I have a SCF that is acting strange. See these 2 query times: get NamespaceRevision[3cd88d97-ffde-44ca-8ae9-5336caaebc4e] limit 33; ... Returned 33 results. Elapsed time: 41 msec(s). get ...
    André CruzAndré Cruz
    Nov 6, 2012 at 2:43 pm
    Nov 14, 2012 at 4:14 am
  • I am sorry if this is an FAQ. But I was wondering what the syntax for describing an array? I have gotten as far as feeling a need to understand a 'super-column' but I fail after that. Once I have the ...
    Kevin BurtonKevin Burton
    Nov 12, 2012 at 7:35 am
    Nov 15, 2012 at 3:50 am
  • Hello everyone, We are running a 3 node Cassandra 1.1.5 cluster with a 3TB Raid 0 disk per node for the data dir and separate disk for the commitlog, 12 cores, 24 GB RAM (12GB to Cassandra heap). We ...
    Alexandru SicoeAlexandru Sicoe
    Nov 22, 2012 at 7:17 pm
    Dec 7, 2012 at 1:30 pm
  • Can you provide an example of the increase ? Can you provide the log from startup ? Cheers ----------------- Aaron Morton Freelance Cassandra Developer New Zealand @aaronmorton ...
    Aaron MortonAaron Morton
    Nov 15, 2012 at 8:17 pm
    Nov 21, 2012 at 6:54 am
  • Out of curiosity, is it for the purpose of avoiding streaming? the former would require you to perform a shuffle to achieve that. Is there a nodetool option or are there other ways "shuffle" could be ...
    Manu ZhangManu Zhang
    Nov 2, 2012 at 3:06 am
    Jan 10, 2013 at 2:10 am
  • Everyone, We've just open-sourced a new Java driver we have been working on here at DataStax. This driver is CQL3 only and is built to use the new binary protocol that will be introduced with ...
    Sylvain LebresneSylvain Lebresne
    Nov 19, 2012 at 6:51 pm
    Nov 23, 2012 at 9:25 am
  • Does the official/built-in Cassandra CQL client (in 1.2) offer any built-in option to get direct values/objects when reading a field, instead of just a byte array?
    Timmy TurnerTimmy Turner
    Nov 15, 2012 at 10:21 pm
    Nov 19, 2012 at 8:48 pm
  • Some times, when I try to insert a data in Cassandra with Method: static void createColumnFamily(String keySpace, String columnFamily){ synchronized (mutex){ Iface cs = new CassandraServer(); CfDef ...
    Everton LimaEverton Lima
    Nov 14, 2012 at 2:13 pm
    Nov 20, 2012 at 4:55 am
  • Hi All, I am doing a benchmark on a Cassandra. I have a three node cluster with RF=3. I generated 6M rows with sequence number from 1 to 6m, so the rows should be evenly distributed among the three ...
    Wei ZhuWei Zhu
    Nov 9, 2012 at 5:37 am
    Nov 14, 2012 at 4:31 am
  • We have a cluster running cassandra 1.1.4. On this cluster, 1. We had to move the nodes around a bit when we were adding new nodes (there was quite a good amount of node movement ) 2. We had to stop ...
    Ananth GundabattulaAnanth Gundabattula
    Nov 17, 2012 at 12:19 pm
    Dec 10, 2012 at 6:28 pm
  • Previously we said you can change the schema online, but only do it at one node at a time. In v1.2 you can have multiple clients issues schema changes without worrying about serialising them. For ...
    Aaron MortonAaron Morton
    Nov 26, 2012 at 7:42 am
    Nov 28, 2012 at 9:07 pm
  • hi Cassandra Developers, I am experiencing huge commitlog size (200+G) after inserting huge amount of data. It is a 4-node cluster with RF= 3, and currently each has 200+G commit log (so there are ...
    Chuan-Heng HsiaoChuan-Heng Hsiao
    Nov 17, 2012 at 1:31 am
    Nov 26, 2012 at 7:44 am
  • If we create a column family: CREATE TABLE videos ( videoid uuid, videoname varchar, username varchar, description varchar, tags varchar, upload_date timestamp, PRIMARY KEY (videoid,videoname) ); The ...
    Edward CaprioloEdward Capriolo
    Nov 4, 2012 at 6:50 pm
    Nov 6, 2012 at 7:44 am
  • Hello, I am trying to run a Hadoop job that pulls data out of Cassandra via ColumnFamilyInputFormat. I am getting a "frame size" exception. To remedy that, I have set both the ...
    Marko RodriguezMarko Rodriguez
    Nov 9, 2012 at 10:03 pm
    Nov 29, 2012 at 1:03 am
  • Hello, I have some questions regarding Cassandra row cache and could use some help on this. On a 6-node v1.1.1 cluster, each node has key cache size in mb set to 0, and row cache size in mb to 1024, ...
    Yiming SunYiming Sun
    Nov 28, 2012 at 4:16 am
    Nov 28, 2012 at 2:37 pm
  • The Cassandra team is pleased to announce the release of the second beta for the future Apache Cassandra 1.2.0. Let me first stress that this is beta software and as such is *not* ready for ...
    Sylvain LebresneSylvain Lebresne
    Nov 9, 2012 at 8:01 am
    Nov 12, 2012 at 5:33 pm
  • Is it better to have 10 Keyspaces with 10 CF in each keyspace. or 100 keyspaces with 1 CF each. I am talking in terms of memory footprint. Also I would be interested to know how much better one is ...
    Sankalp kohliSankalp kohli
    Nov 8, 2012 at 10:00 pm
    Nov 9, 2012 at 2:40 am
  • Hi,**** ** ** I was testing upgrading from Cassandra v.1.0.7 to v.1.1.5 yesterday on a single node dev cluster with ~6.5GB of data & it went smoothly in that no errors were thrown, the data was ...
    Brian FlemingBrian Fleming
    Nov 1, 2012 at 8:11 am
    Nov 1, 2012 at 9:16 pm
  • Dear All, I have Cassandra 1.1.4 cluster with 2 nodes. I need to take backup and restore on staging for testing purpose. I have taken snapshot with below mentioned command but It created snapshot on ...
    Adeel AkbarAdeel Akbar
    Nov 28, 2012 at 11:40 am
    Dec 4, 2012 at 8:12 pm
  • I have backed up production sstables from one of my 3 production nodes (RF=3) and I want to use them on my dev environment.(C* 1.1.6 on both environments) My dev server is a 4 core, 4 GB RAM hardware ...
    Nov 19, 2012 at 5:28 pm
    Nov 21, 2012 at 9:09 am
  • It was mentioned the other day. What version are you on ? Do you know how many rows were loaded ? When complete it will log a message with the pattern "completed loading (%d ms; %d keys) row cache ...
    Aaron MortonAaron Morton
    Nov 19, 2012 at 9:01 pm
    Nov 21, 2012 at 1:04 am
  • Hi, We recently ran a major compaction across our cluster, which reduced the storage used by about 50%. This is fine, since we do a lot of updates to existing data, so that's the expected result. The ...
    Henrik SchröderHenrik Schröder
    Nov 8, 2012 at 10:55 am
    Nov 16, 2012 at 11:07 am
  • Hey Guys, What should I look out for when deploying a single node installation? We want to launch a product that uses Cassandra and since we are going to have very little load initially, we were ...
    Drew KutcharianDrew Kutcharian
    Nov 5, 2012 at 5:49 pm
    Nov 12, 2012 at 10:49 pm
  • I have a 4 node cluster, version 1.1.2, replication factor of 4, read/write consistency of 3, level compaction. Several questions. 1) Should nodetool repair be run regularly to assure it has ...
    Dwight SmithDwight Smith
    Nov 16, 2012 at 12:12 am
    Jan 7, 2013 at 5:55 pm
  • People, when i try to execute my program that use EmbeddedCassandraService, with the version 1.1.2 of cassandra in "OpenSuse Real Time" operation system it is throwing the follow exception: [27/11/12 ...
    Everton LimaEverton Lima
    Nov 27, 2012 at 12:41 pm
    Dec 9, 2012 at 10:06 pm
  • Hi, I am trying to understand some strange behavior of cassandra row cache. We have a 6-node Cassandra cluster in a single data center on 2 racks, and the neighboring nodes on the ring are from ...
    Yiming SunYiming Sun
    Nov 28, 2012 at 7:21 pm
    Dec 4, 2012 at 8:35 pm
  • Some people (myself included) have seen issues when upgrading from 1.1.2 to 1.1.6 with tombstoned rows in the HintsColumnFamily Some (mysql included) have fixed this by doing a nodetool scrub system ...
    Michael KjellmanMichael Kjellman
    Nov 24, 2012 at 4:29 pm
    Nov 26, 2012 at 1:10 am
  • Hi there, We have had a crashed node that is currently removed from the rack. However when I try a schema upgrade / truncate operation it complains of the unreachable node. I tried the removetoken, ...
    Robin VerlangenRobin Verlangen
    Nov 9, 2012 at 1:37 pm
    Nov 19, 2012 at 1:15 pm
  • Jeremy McKayJeremy McKay
    Nov 9, 2012 at 12:57 am
    Nov 16, 2012 at 3:34 pm
  • Hi people, I was using cassandra on distributed project. I am using java 6 and cassandra 1.1.6. My problem is in Memory manager (I think). My system was throwing heap limit exception. The problem is ...
    Everton LimaEverton Lima
    Nov 12, 2012 at 12:29 pm
    Nov 14, 2012 at 9:16 pm
  • Hi, Lets say I am reading with consistency TWO and my replication is 3. The read is eligible for global read repair. It will send a request to get data from one node and a digest request to two. If ...
    Sankalp kohliSankalp kohli
    Nov 8, 2012 at 10:44 pm
    Nov 14, 2012 at 3:15 am
  • If you shutdown c* and remove an sstable (and it associated data, index, bloom filter , and etc) files it is safe. I would delete any saved caches as well. It is safe in the sense that Cassandra will ...
    Edward CaprioloEdward Capriolo
    Nov 12, 2012 at 5:24 am
    Nov 13, 2012 at 9:50 am
  • Hi, We just had some issue in production that we finally solve upgrading hardware and increasing the heap. Now we have 3 xLarge servers from AWS (15G RAM, 4 cpu - 8 cores). We add them and then ...
    Nov 7, 2012 at 9:57 am
    Nov 12, 2012 at 8:58 pm
  • I am sure this has been asked before but what is the purpose of entering key/value or more correctly key name/data type values on the CREATE COLUMNFAMILY command.
    Kevin BurtonKevin Burton
    Nov 11, 2012 at 4:55 am
    Nov 12, 2012 at 12:12 am
  • The first thing to check is the log files under /var/log/cassandra, should give you some hint. Thanks. -Wei Sent from my Samsung smartphone on AT&T -------- Original message -------- Subject ...
    Nov 11, 2012 at 3:07 am
    Nov 11, 2012 at 9:35 pm
  • I have 4 nodes at my disposal. I can configure them like this: 1) RF=1, each node has 25% of the data. On random-reads, how big is the performance penalty if a node needs to look for data on another ...
    Oleg DulinOleg Dulin
    Nov 5, 2012 at 4:58 pm
    Nov 10, 2012 at 5:36 pm
  • Hi, I'm attempting to build an index on a column acting as part of a composite key. This is what I have so far: CREATE TABLE userinfo2 ( campaignId int, TS timestamp, somevalue text, PRIMARY KEY ...
    Maxim VekslerMaxim Veksler
    Nov 5, 2012 at 9:54 am
    Nov 5, 2012 at 12:50 pm
  • I am trying to bootstrap cassandra 1.0.10 cluster of 7 nodes to 14 nodes. My seed nodes are 101, 102, 103 and 104. Here is my initial ring Address DC Rack Status State Load Owns Token ...
    Ramesh NatarajanRamesh Natarajan
    Nov 1, 2012 at 4:31 pm
    Nov 2, 2012 at 7:06 am
  • Good morning. We are thinking of setting up 3 data centers with "NetworkTopologyStrategy" with each DC having 1 copy. All three data centers are going to be connected by dark fiber with < 10 ms ...
    Baskar DuraikannuBaskar Duraikannu
    Nov 12, 2012 at 2:22 pm
    Dec 21, 2012 at 3:44 am
  • Hi, I am carrying out some performance test against a 6-node cassandra cluster (v1.1.0), and need to disable the key cache entirely as one of the scenarios. However, by setting key_cache_size_in_mb ...
    Yiming SunYiming Sun
    Nov 27, 2012 at 3:13 am
    Nov 27, 2012 at 5:24 am
  • Dear Community, advice from you needed. We have a cluster, 1/6 nodes of which died for various reasons(3 had OOM message). Nodes died in groups of 3, 1, 2. No adjacent died, though we use ...
    Ивaн CобoлeвИвaн Cобoлeв
    Nov 17, 2012 at 6:08 am
    Nov 26, 2012 at 11:51 am
  • Is there an IDE for a Cassandra database? Similar to the SQL Server Management Studio for SQL server. I mainly want to execute queries and see the results. Preferably that runs under a Windows OS ...
    Kevin BurtonKevin Burton
    Nov 15, 2012 at 10:53 pm
    Nov 16, 2012 at 5:45 pm
  • 2 questions 1. What are people using for logging servers for their web tier logging? 2. Would anyone be interested in a new logging server(any programming language) for web tier to log to your ...
    Hiller, DeanHiller, Dean
    Nov 1, 2012 at 2:34 pm
    Nov 7, 2012 at 3:11 pm
  • Would that do any harm or are there any downsides, if I store columns with composite names or Integer type names in a column family with bytesType comparator & validator. I have observed that ...
    Ertio LewErtio Lew
    Nov 1, 2012 at 1:42 pm
    Nov 5, 2012 at 8:18 am
  • I know there is very little insight currently into long running JMX operations but has anyone figured out any way clever to determine approximate progress on cleanup operations? Merci. Best, Michael ...
    Michael KjellmanMichael Kjellman
    Nov 29, 2012 at 4:51 pm
    Nov 30, 2012 at 2:01 am
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137 users for November 2012

Aaron Morton: 54 posts Edward Capriolo: 45 posts Alain RODRIGUEZ: 29 posts Sylvain Lebresne: 29 posts Rob Coli: 23 posts Wz1975: 23 posts Manu Zhang: 20 posts Michael Kjellman: 15 posts Kevin Burton: 14 posts Everton Lima: 12 posts Bryan Talbot: 11 posts B. Todd Burruss: 10 posts Chuan-Heng Hsiao: 10 posts Horschi: 10 posts Timmy Turner: 10 posts Yiming Sun: 10 posts Brian O'Neill: 9 posts Tyler Hobbs: 9 posts André Cruz: 8 posts Ertio Lew: 8 posts
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