dedicated gossip lan
Hi, Did anyone used a dedicated interfaces and LAN / VLAN for gossip traffic ? Any benefits in such approach ? Cheers, Sorin
Re: dedicated gossip lan
Sorry for not being clear. Indeed I mean a separate LAN and interfaces for listen_address. - sorin On Tue, Oct 4, 2011 at 10:49 PM, Brandon Williams dri...@gmail.com wrote: On Tue, Oct 4, 2011 at 2:00 PM, Sorin Julean sorin.jul...@gmail.com wrote: Hi, Did anyone used a dedicated interfaces and LAN / VLAN for gossip traffic ? Any benefits in such approach ? I don't think there is any substantial benefit to doing this, but also it's impossible: gossip is not separate from the storage protocol. Of course, I am assuming you mean just gossip, but if what you actually mean is the entire storage protocol (listen_address) then yes, there is benefit to having a dedicated network for that. -Brandon
Re: Can't connect to MX4J endpoint on Ubuntu
Hey, Do a: grep -i mx4 system.log | less and look for: Mx4jTool.java (line 67) mx4j successfuly loaded Also make sure you have the latest mx4j-tool from: http://sourceforge.net/projects/mx4j/files/MX4J%20Binary/3.0.2/ Kind regards, Sorin On Fri, Sep 23, 2011 at 11:55 PM, Iwona Bialynicka-Birula iwona...@atigeo.com wrote: Hello, ** ** I am trying to monitor Cassandra 8.0 using MX4J as described in http://wiki.apache.org/cassandra/Operations#Monitoring_with_MX4J. I have mx4j-tools.jar in Cassandra’s lib folder and when Cassandra starts in prints out: HttpAdaptor version 3.0.1 started on port 8081 ** ** But when I try to open http://localhost:8081/ in my browser I get “unable to connect”. I checked that Cassandra daemon (only) is listening on port 8081 and that there are no errors in the logs. ** ** Any ideas, why Cassandra is not answering on the 8081 MX4J port? ** ** Thanks, Iwona
memtable flush thresholds
Hi, I've checked the memtable flush (cassandra 0.8.4) and it seams to me it hapens sooner then the threshold is reached. Here's the threshould's (the default ones calculated for a heap size of -Xmx1980M): ColumnFamily: idx_graphable (Super) Key Validation Class: org.apache.cassandra.db.marshal.BytesType Default column value validator: org.apache.cassandra.db.marshal.BytesType Columns sorted by: org.apache.cassandra.db.marshal.UTF8Type/org.apache.cassandra.db.marshal.UTF8Type Row cache size / save period in seconds: 0.0/0 Key cache size / save period in seconds: 20.0/14400 *Memtable thresholds: 0.5671875/1440/121 (millions of ops/minutes/MB)* GC grace seconds: 864000 Compaction min/max thresholds: 4/32 Read repair chance: 1.0 Replicate on write: true In the logs it seams to me none oh the thresold is reached ( definitively minutes threshold is not reached ). 9-08 20:12:30,136 MeteredFlusher.java (line 62) flushing high-traffic column family ColumnFamilyStore(table='graph', columnFamily='idx_graphable') INFO [NonPeriodicTasks:1] 2011-09-08 20:12:30,144 ColumnFamilyStore.java (line 1036) Enqueuing flush of Memtable-idx_graphable@915643571*(4671498/96780112 serialized/live bytes, 59891 ops)* INFO [FlushWriter:111] 2011-09-08 20:12:30,145 Memtable.java (line 237) Writing Memtable-idx_graphable@915643571(4671498/96780112 serialized/live bytes, 59891 ops) INFO [FlushWriter:111] 2011-09-08 20:12:30,348 Memtable.java (line 254) Completed flushing [...]/cassandra/data/graph/idx_graphable-g-23-Data.db (4673905 bytes) Could someone clarify it for me ? high-traffic column family has a special meaning ? Many thanks, Sorin
Re: memtable flush thresholds
Thanks Jonathan ! memtable_total_space_in_mb is the threshold that is reached. Kind regards, Sorin On Mon, Sep 12, 2011 at 3:16 PM, Jonathan Ellis jbel...@gmail.com wrote: see memtable_total_space_in_mb at http://thelastpickle.com/2011/05/04/How-are-Memtables-measured/ On Mon, Sep 12, 2011 at 6:55 AM, Sorin Julean sorin.jul...@gmail.com wrote: Hi, I've checked the memtable flush (cassandra 0.8.4) and it seams to me it hapens sooner then the threshold is reached. Here's the threshould's (the default ones calculated for a heap size of -Xmx1980M): ColumnFamily: idx_graphable (Super) Key Validation Class: org.apache.cassandra.db.marshal.BytesType Default column value validator: org.apache.cassandra.db.marshal.BytesType Columns sorted by: org.apache.cassandra.db.marshal.UTF8Type/org.apache.cassandra.db.marshal.UTF8Type Row cache size / save period in seconds: 0.0/0 Key cache size / save period in seconds: 20.0/14400 Memtable thresholds: 0.5671875/1440/121 (millions of ops/minutes/MB) GC grace seconds: 864000 Compaction min/max thresholds: 4/32 Read repair chance: 1.0 Replicate on write: true In the logs it seams to me none oh the thresold is reached ( definitively minutes threshold is not reached ). 9-08 20:12:30,136 MeteredFlusher.java (line 62) flushing high-traffic column family ColumnFamilyStore(table='graph', columnFamily='idx_graphable') INFO [NonPeriodicTasks:1] 2011-09-08 20:12:30,144 ColumnFamilyStore.java (line 1036) Enqueuing flush of Memtable-idx_graphable@915643571(4671498/96780112 serialized/live bytes, 59891 ops) INFO [FlushWriter:111] 2011-09-08 20:12:30,145 Memtable.java (line 237) Writing Memtable-idx_graphable@915643571(4671498/96780112 serialized/live bytes, 59891 ops) INFO [FlushWriter:111] 2011-09-08 20:12:30,348 Memtable.java (line 254) Completed flushing [...]/cassandra/data/graph/idx_graphable-g-23-Data.db (4673905 bytes) Could someone clarify it for me ? high-traffic column family has a special meaning ? Many thanks, Sorin -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
Cassandra prod environment
Hey, Currently I'm running Cassandra on Ubuntu 10.4 x86_64 in EC2. I'm wondering if anyone observed a better performance / stability on other distros ( CentOS / RHEL / ...) or OS (eg. Solaris intel/SPARC) ? Is anyone running prod on VMs, not cloud, but ESXi or Solaris zones ? Is there love or hate :) ? Any storage best-practices on VM environments ? I like xfs ! Any observations on xfs / ext4 / zfs, from Cassandra usage perspective ? Cheers, Sorin
Re: Nodetool ring not showing all nodes in cluster
Hi, Until someone answers with more details, few questions: 1. did you moved the system keyspace as well ? 2. the gossip IP of the new nodes are the same as the old ones ? 3. which cassandra version are you running ? If 1. is yes and 2. is no, for a quick fix: take down the cluster, remove system keyspace, bring the cluster up and bootstrap the nodes. Kind regards, Sorin On Tue, Aug 2, 2011 at 2:53 PM, Aishwarya Venkataraman cyberai...@gmail.com wrote: Hello, I recently migrated 400 GB of data that was on a different cassandra cluster (3 node with RF= 3) to a new cluster. I have a 3 node cluster with replication factor set to three. When I run nodetool ring, it does not show me all the nodes in the cluster. It always keeps showing only one node and mentions that it is handling 100% of the load. But when I look at the logs, the nodes are able to talk to each other via the gossip protocol. Why does this happen ? Can you tell me what I am doing wrong ? Thanks, Aishwarya
Re: Cassandra auto keyspace operation using script
Hey, Try: echo *-e* connnet localhost/9160;* \n*show keyspace*;* | bin/cassandra-cli Regards, Sorin On Fri, Jul 29, 2011 at 9:54 AM, 祝海通 zhuhait...@gmail.com wrote: In our Cassandra test for YCSB benchmark, we want to create column family and drop keyspace with script automatically. But I fount that in our script. /bin/cassandra-cli; connect localhost/9160; show keyspace; can not execute. Using the does not work. and Using echo connnet localhost/9160; show keyspace ｜bin/cassandra-cli It doesn't work too. haitongz
