cassandra - CPU usage goes high when read -


i using cassandra 1.2.5, have 4 nodes in cluster. each node m1.large system memory 8gb. read more. have 50,000 rows in column family. when ever try read data column family, every time either node3 or node4 cpu usage going high. have given logs below this.

can make compaction strategy leveledcompactionstrategy , sstable_size_in_mb 10 problem. help?

is there other solution this?

logs:

 info [scheduledtasks:1] 2013-07-25 12:59:04,660 statuslogger.java (line 95) cache type                     size                 capacity               keystosave                                                         provider  info [scheduledtasks:1] 2013-07-25 12:59:04,660 statuslogger.java (line 96) keycache                   18523284                 52428800                             info [scheduledtasks:1] 2013-07-25 12:59:04,661 statuslogger.java (line 102) rowcache                          0               1073741824                                   org.apache.cassandra.cache.serializingcacheprovider  info [scheduledtasks:1] 2013-07-25 12:59:04,661 statuslogger.java (line 109) columnfamily                memtable ops,data  info [scheduledtasks:1] 2013-07-25 12:59:04,661 statuslogger.java (line 112) system.local                              0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,661 statuslogger.java (line 112) system.peers                          60,8040  info [scheduledtasks:1] 2013-07-25 12:59:04,662 statuslogger.java (line 112) system.batchlog                           0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,671 statuslogger.java (line 112) system.nodeidinfo                         0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,671 statuslogger.java (line 112) system.locationinfo                       0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,671 statuslogger.java (line 112) system.schema                             0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,671 statuslogger.java (line 112) system.migrations                         0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,672 statuslogger.java (line 112) system.schema_keyspaces                 8,251  info [scheduledtasks:1] 2013-07-25 12:59:04,672 statuslogger.java (line 112) system.schema_columns               332,21903  info [scheduledtasks:1] 2013-07-25 12:59:04,672 statuslogger.java (line 112) system.schema_columnfamilies           352,21775  info [scheduledtasks:1] 2013-07-25 12:59:04,672 statuslogger.java (line 112) system.indexinfo                          0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,672 statuslogger.java (line 112) system.range_xfers                        0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,673 statuslogger.java (line 112) system.peer_events                        0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,673 statuslogger.java (line 112) system.hints                              0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,673 statuslogger.java (line 112) system.hintscolumnfamily                  0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,673 statuslogger.java (line 112) gen_gen.feedserver_dependentfeeds                 0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,673 statuslogger.java (line 112) gen_gen.feedserver_componentname       18648,1048576  info [scheduledtasks:1] 2013-07-25 12:59:04,674 statuslogger.java (line 112) gen_gen.feedserver_feedscheduler      128952,2097152  info [scheduledtasks:1] 2013-07-25 12:59:04,739 statuslogger.java (line 112) gen_gen.feedserver_feedtype                 0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,739 statuslogger.java (line 112) gen_gen.feedserver_itemdef                 0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,739 statuslogger.java (line 112) gen_gen.feedserver_feed         66629,2097152  info [scheduledtasks:1] 2013-07-25 12:59:04,740 statuslogger.java (line 112) system_auth.users                         0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,740 statuslogger.java (line 112) opscenter.events                          0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,740 statuslogger.java (line 112) opscenter.rollups60                       0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,740 statuslogger.java (line 112) opscenter.settings                        0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,740 statuslogger.java (line 112) opscenter.pdps                            0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,741 statuslogger.java (line 112) opscenter.rollups86400                    0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,741 statuslogger.java (line 112) opscenter.events_timeline                 0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,741 statuslogger.java (line 112) opscenter.rollups300                      0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,741 statuslogger.java (line 112) opscenter.rollups7200                     0,0  info [scheduledtasks:1] 2013-07-25 12:59:04,741 statuslogger.java (line 112) system_traces.sessions                    0,0

if you're seeing memory pressure during reads, you're reading many rows @ once. tracing request can give more visibility what's going on: http://www.datastax.com/dev/blog/tracing-in-cassandra-1-2


Comments

Post a Comment

Popular posts from this blog

curl - PHP fsockopen help required -

i trying work on cloudflare api , have found in documentation. unfortunately have no idea how can use in fsockopen or through curl. here example of post request. need know how can make request below data post using curl or fsockopen curl https://www.cloudflare.com/api_json.html -d 'a=cache_lvl' \ -d 'tkn=8afbe6dea02407989af4dd4c97bb6e25' \ -d 'email=sample@example.com' \ -d 'z=example.com' \ -d 'v=agg' here link cloudflare https://www.cloudflare.com/docs/client-api.html#s4.2 try one: $ch = curl_init("https://www.cloudflare.com/api_json.html"); curl_setopt($ch, curlopt_returntransfer,1); curl_setopt($ch, curlopt_followlocation, 1); curl_setopt($ch, curlopt_ssl_verifypeer,false); // handling of -d curl parameter here. $param = array( 'a' => 'cache_lvl', 'tkn' => '8afbe6dea02407989af4dd4c97bb6e25', 'email' => 'sample@example.com', 'z' =...
Read more

HTTP/1.0 407 Proxy Authentication Required PHP -

i working in restricted network/limited access internet. since have use proxy make web service call. here php code calling web service , response . $client = new soapclient("http: //www.xyz.com/abc/wsdls/login.wsdl", array("trace" => 1, "exceptions" => 1, 'proxy_host' => $proxy_host, 'proxy_port' => $proxy_port, 'proxy_login' => $proxy_login, 'proxy_password' => $proxy_password)); response is fatal error: uncaught soapfault exception: [wsdl] soap-error: parsing wsdl: couldn't load ' http://www.xyz.com/abc/wsdls/login.wsdl ' : failed load external entity if copy url error message , paste in browser(with same proxy settings) works. 2nd scenario is, if pass values instead of variables giving me diffarant response $client = new soapclient("http: //www.xyz.com/abc/wsdls/login.wsdl", array("trace" => 1, "exceptions" => 1, 'proxy_host' ...
Read more

c# - Resource not found error -

i have problem accessing method on homecontroller. show code of method : [httpget] public actionresult decriptidentifiantetredirige(string login_crypter, string mdp_crypter) { string loginacrypter = _globalmanager.protegemotdepasse(login_crypter); string mdpacrypter = _globalmanager.protegemotdepasse(mdp_crypter); user userapp = new models.user(login_crypter, mdp_crypter); if (userapp.authentificationvalidee(userapp.userlogin, userapp.password)) { session["name"] = userapp.userlogin; return redirecttoaction("accueil", "home"); } else { return redirecttoaction("validerauthentification", "home"); } } then in routeconfig.cs wrote route : routes.maproute( name: "authentificationapresdecryptage", url: "{controller}/{action}/{login_crypter}/{mdp_crypter}", defaults: new...
Read more