DataStax Support Forums » Topic: "Loading OpsCenter..." -> "Error loading cluster: Call to /nodes/all timed out.&qu

DataStax Support Forums » Topic: "Loading OpsCenter..." -> "Error loading cluster: Call to /nodes/all timed out.&qu http://www.datastax.com/support-forums/topic/loading-opscenter-error-loading-cluster-call-to-nodesall-timed-out Software, Support, and Training for Apache Cassandra en-US Fri, 24 May 2013 04:40:05 +0000 http://bbpress.org/?v=1.0.3 <![CDATA[Search]]> q http://www.datastax.com/support-forums/search.php mbulman on ""Loading OpsCenter..." -> "Error loading cluster: Call to /nodes/all timed out.&qu" http://www.datastax.com/support-forums/topic/loading-opscenter-error-loading-cluster-call-to-nodesall-timed-out#post-164 Wed, 15 Jun 2011 18:51:44 +0000 mbulman 164@http://www.datastax.com/support-forums/ TheSaint, yeah. BOP will be supported in our next release (1.2) which is slated for release around July 8 though. TheSaint on ""Loading OpsCenter..." -> "Error loading cluster: Call to /nodes/all timed out.&qu" http://www.datastax.com/support-forums/topic/loading-opscenter-error-loading-cluster-call-to-nodesall-timed-out#post-163 Wed, 15 Jun 2011 18:50:09 +0000 TheSaint 163@http://www.datastax.com/support-forums/ mbulman, is this still the case and can this cause OpsCenter not to be able to connect to the cluster? "OpsCenter doesn't currently work with clusters using ByteOrderPartitioner. RandomPartitioner and OrderPreservingPartitioner should both work fine though." secu on ""Loading OpsCenter..." -> "Error loading cluster: Call to /nodes/all timed out.&qu" http://www.datastax.com/support-forums/topic/loading-opscenter-error-loading-cluster-call-to-nodesall-timed-out#post-27 Mon, 09 May 2011 06:16:31 +0000 secu 27@http://www.datastax.com/support-forums/ Damned! I should read this before to struggle with Ops... elz on ""Loading OpsCenter..." -> "Error loading cluster: Call to /nodes/all timed out.&qu" http://www.datastax.com/support-forums/topic/loading-opscenter-error-loading-cluster-call-to-nodesall-timed-out#post-15 Fri, 22 Apr 2011 20:42:23 +0000 elz 15@http://www.datastax.com/support-forums/ Perfect, thankyou mbulman on ""Loading OpsCenter..." -> "Error loading cluster: Call to /nodes/all timed out.&qu" http://www.datastax.com/support-forums/topic/loading-opscenter-error-loading-cluster-call-to-nodesall-timed-out#post-8 Fri, 22 Apr 2011 18:22:04 +0000 mbulman 8@http://www.datastax.com/support-forums/ OpsCenter doesn't currently work with clusters using ByteOrderPartitioner. RandomPartitioner and OrderPreservingPartitioner should both work fine though. elz on ""Loading OpsCenter..." -> "Error loading cluster: Call to /nodes/all timed out.&qu" http://www.datastax.com/support-forums/topic/loading-opscenter-error-loading-cluster-call-to-nodesall-timed-out#post-7 Fri, 22 Apr 2011 18:08:16 +0000 elz 7@http://www.datastax.com/support-forums/ Hi, I'm attempting to evaluate opscenter at the moment, but I'm having difficulty getting it to play ball on my single-node development machine: Ubuntu Maverick Vanilla Cassandra 0.7.4 ( binary tarball install ) Cassandra is running fine, and the OpsCenter daemon aptitude installation went without a hitch, but <a href="http://localhost:8888" rel="nofollow">http://localhost:8888</a> just gives me a "Loading OpsCenter..." page which will eventually timeout and popup a "Error loading cluster: Call to /nodes/all timed out." message. I tried manually installing the opscenter agent, as per the install guide ( and the services seem to be running ) - but this didn't appear to help. I've also tried defining an rmi server host in cassandra-env.sh: JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=127.0.0.1" Any pointers will be much appreciated Cheers, Joe Fox <code> ----------------------------------------------------- elzorro 7143 0.2 3.7 3554320 228036 pts/0 Sl 19:37 0:04 /usr/bin/java -ea -XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42 -Xms2986M -Xmx2986M -Xmn746M -XX:+HeapDumpOnOutOfMemoryError -Xss128k -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:SurvivorRatio=8 -XX:MaxTenuringThreshold=1 -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -Djava.net.preferIPv4Stack=true -Djava.rmi.server.hostname=127.0.0.1 -Dcom.sun.management.jmxremote.port=8080 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Dlog4j.configuration=log4j-server.properties -Dlog4j.defaultInitOverride=true -Dcassandra-pidfile=cassandra.pid -cp bin/../conf:bin/../build/classes:bin/../lib/antlr-3.1.3.jar:bin/../lib/apache-cassandra-0.7.4.jar:bin/../lib/avro-1.4.0-fixes.jar:bin/../lib/avro-1.4.0-sources-fixes.jar:bin/../lib/commons-cli-1.1.jar:bin/../lib/commons-codec-1.2.jar:bin/../lib/commons-collections-3.2.1.jar:bin/../lib/commons-lang-2.4.jar:bin/../lib/concurrentlinkedhashmap-lru-1.1.jar:bin/../lib/guava-r05.jar:bin/../lib/high-scale-lib.jar:bin/../lib/jackson-core-asl-1.4.0.jar:bin/../lib/jackson-mapper-asl-1.4.0.jar:bin/../lib/jetty-6.1.21.jar:bin/../lib/jetty-util-6.1.21.jar:bin/../lib/jline-0.9.94.jar:bin/../lib/json-simple-1.1.jar:bin/../lib/jug-2.0.0.jar:bin/../lib/libthrift-0.5.jar:bin/../lib/log4j-1.2.16.jar:bin/../lib/mx4j-tools.jar:bin/../lib/servlet-api-2.5-20081211.jar:bin/../lib/slf4j-api-1.6.1.jar:bin/../lib/slf4j-log4j12-1.6.1.jar:bin/../lib/snakeyaml-1.6.jar org.apache.cassandra.thrift.CassandraDaemon root 7350 0.0 0.3 86616 23008 ? S 19:38 0:00 /usr/bin/python /usr/bin/twistd -u 0 -g 0 --pidfile /var/run/opscenter/opscenterd.pid -l /var/log/opscenter/opscenterd.log -y /usr/share/opscenter/bin/start_opscenter.py root 7352 0.7 3.3 1997660 205640 ? Sl 19:38 0:11 /usr/bin/java -Djava.library.path=/usr/lib/jni -Dpython.cachedir=/root/.jython_cache org.python.util.jython -jar /usr/share/opscenter/bin/jmxjython.jar -t 50 -k 60 --automated root 9349 0.0 0.0 21784 1836 ? S 20:02 0:00 /bin/bash /opt/opscenter/usr/share/opscenter-agent/bin/opscenter_agent_monitor root 9360 0.0 0.2 71816 14004 ? S 20:02 0:00 /usr/bin/python /usr/bin/twistd --pidfile /var/run/opscenter-agent/opscenter-agent.pid --syslog --prefix='opscenter-agent' -y /opt/opscenter/usr/share/opscenter-agent/bin/start_opscenter_agent.py elzorro 9430 0.0 0.0 10112 868 pts/0 S+ 20:04 0:00 grep --color=auto ops ------------------------------------------------- Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 127.0.0.1:9160 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:8081 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:61619 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:61620 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:57717 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:8888 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:7000 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:48608 0.0.0.0:* LISTEN ------------------------------------------------------------ 2011-04-22 19:38:49+0200 [-] Log opened. 2011-04-22 19:38:49+0200 [-] twistd 10.2.0 (/usr/bin/python 2.6.6) starting up. 2011-04-22 19:38:49+0200 [-] reactor class: twisted.internet.selectreactor.SelectReactor. 2011-04-22 19:38:49+0200 [-] opscenterd.WebServer.OpsCenterdWebServer starting on 8888 2011-04-22 19:38:49+0200 [-] Starting factory <opscenterd.WebServer.OpsCenterdWebServer instance at 0x17a8b00> 2011-04-22 19:38:49+0200 [-] morbid.morbid.StompFactory starting on 61619 2011-04-22 19:38:49+0200 [-] Starting factory <morbid.morbid.StompFactory instance at 0x17c26c8> 2011-04-22 19:38:49+0200 [-] morbid.morbid.StompFactory starting on 61620 2011-04-22 19:38:49+0200 [-] set uid/gid 0/0 2011-04-22 19:38:49+0200 [-] OpsCenterdService startService 2011-04-22 19:38:49+0200 [-] JmxJythonService started. State is now "startup". 2011-04-22 19:38:49+0200 [-] Starting CassandraCluster service 2011-04-22 19:38:49+0200 [-] Adding connection to <CassandraNode 127.0.0.1:9160 @0x17c6dd0> 2011-04-22 19:38:49+0200 [-] Adding connection to <CassandraNode 127.0.0.1:9160 @0x17c6dd0> 2011-04-22 19:38:49+0200 [-] Adding connection to <CassandraNode 127.0.0.1:9160 @0x17c6dd0> 2011-04-22 19:38:49+0200 [-] Adding connection to <CassandraNode 127.0.0.1:9160 @0x17c6dd0> 2011-04-22 19:38:49+0200 [-] Adding connection to <CassandraNode 127.0.0.1:9160 @0x17c6dd0> 2011-04-22 19:38:49+0200 [CassandraPoolParticipantClient,client] /usr/lib/pymodules/python2.6/telephus/pool.py:274: telephus.pool.NoKeyspacesAvailable: Can't gather information about the Cassandra ring; no non-system keyspaces available 2011-04-22 19:38:49+0200 [CassandraPoolParticipantClient,client] Successfully added connection to <CassandraNode 127.0.0.1:9160 @0x17c6dd0> to the pool 2011-04-22 19:38:49+0200 [CassandraPoolParticipantClient,client] Successfully added connection to <CassandraNode 127.0.0.1:9160 @0x17c6dd0> to the pool 2011-04-22 19:38:49+0200 [CassandraPoolParticipantClient,client] Successfully added connection to <CassandraNode 127.0.0.1:9160 @0x17c6dd0> to the pool 2011-04-22 19:38:49+0200 [CassandraPoolParticipantClient,client] Successfully added connection to <CassandraNode 127.0.0.1:9160 @0x17c6dd0> to the pool 2011-04-22 19:38:49+0200 [CassandraPoolParticipantClient,client] Successfully added connection to <CassandraNode 127.0.0.1:9160 @0x17c6dd0> to the pool 2011-04-22 19:38:49+0200 [CassandraPoolParticipantClient,client] acquired initial keyspace list: [CassandraKeyspace(keyspace=system, column_families=['IndexInfo', 'Schema', 'Migrations', 'LocationInfo', 'HintsColumnFamily'], attributes={'strategy_options': None, 'replica_placement_strategy': 'org.apache.cassandra.locator.LocalStrategy', 'replication_factor': 1})] 2011-04-22 19:38:49+0200 [CassandraPoolParticipantClient,client] acquired snitch: org.apache.cassandra.locator.SimpleSnitch 2011-04-22 19:38:49+0200 [CassandraPoolParticipantClient,client] acquired cluster name: Test Cluster 2011-04-22 19:38:49+0200 [CassandraPoolParticipantClient,client] acquired partitioner: org.apache.cassandra.dht.ByteOrderedPartitioner 2011-04-22 19:38:51+0200 [StompProtocol,0,127.0.0.1] agent for ip 127.0.0.1 is version u'1.0.0' 2011-04-22 19:38:53+0200 [-] JmxJythonService got jmxjython startup message. State is now "normal". --------------------------------------------------------------- # opscenterd.conf [jmx] cassandra_classpath = /usr/share/opscenter/lib/*.jar port = 8080 [webserver] port = 8888 interface = 127.0.0.1 staticdir = /usr/share/opscenter/content [cassandra] forget_nodes_after = 2629800 ; average month # a comma-separated list of places to try for a connection to your Cassandra # cluster: seed_hosts = 127.0.0.1 # the API (Thrift) port on your Cassandra cluster api_port = 9160 [collection] basic_info_period = 3600 node_poll_period = 120 [authentication] # if this file does not exist, there will be no password protection. Use the # set_passwd.py tool (included with OpsCenter) to set passwords. passwd_file = /etc/opscenter/.passwd --------------------------------------------------------------------------- # Cassandra storage config YAML # NOTE: # See <a href="http://wiki.apache.org/cassandra/StorageConfiguration" rel="nofollow">http://wiki.apache.org/cassandra/StorageConfiguration</a> for # full explanations of configuration directives # /NOTE # The name of the cluster. This is mainly used to prevent machines in # one logical cluster from joining another. cluster_name: 'Test Cluster' # You should always specify InitialToken when setting up a production # cluster for the first time, and often when adding capacity later. # The principle is that each node should be given an equal slice of # the token ring; see <a href="http://wiki.apache.org/cassandra/Operations" rel="nofollow">http://wiki.apache.org/cassandra/Operations</a> # for more details. # # If blank, Cassandra will request a token bisecting the range of # the heaviest-loaded existing node. If there is no load information # available, such as is the case with a new cluster, it will pick # a random token, which will lead to hot spots. initial_token: # Set to true to make new [non-seed] nodes automatically migrate data # to themselves from the pre-existing nodes in the cluster. Defaults # to false because you can only bootstrap N machines at a time from # an existing cluster of N, so if you are bringing up a cluster of # 10 machines with 3 seeds you would have to do it in stages. Leaving # this off for the initial start simplifies that. auto_bootstrap: false # See <a href="http://wiki.apache.org/cassandra/HintedHandoff" rel="nofollow">http://wiki.apache.org/cassandra/HintedHandoff</a> hinted_handoff_enabled: true # this defines the maximum amount of time a dead host will have hints # generated. After it has been dead this long, hints will be dropped. max_hint_window_in_ms: 3600000 # one hour # Sleep this long after delivering each row or row fragment hinted_handoff_throttle_delay_in_ms: 50 # authentication backend, implementing IAuthenticator; used to identify users authenticator: org.apache.cassandra.auth.AllowAllAuthenticator # authorization backend, implementing IAuthority; used to limit access/provide permissions authority: org.apache.cassandra.auth.AllowAllAuthority # The partitioner is responsible for distributing rows (by key) across # nodes in the cluster. Any IPartitioner may be used, including your # own as long as it is on the classpath. Out of the box, Cassandra # provides org.apache.cassandra.dht.RandomPartitioner # org.apache.cassandra.dht.ByteOrderedPartitioner, # org.apache.cassandra.dht.OrderPreservingPartitioner (deprecated), # and org.apache.cassandra.dht.CollatingOrderPreservingPartitioner # (deprecated). # # - RandomPartitioner distributes rows across the cluster evenly by md5. # When in doubt, this is the best option. # - ByteOrderedPartitioner orders rows lexically by key bytes. BOP allows # scanning rows in key order, but the ordering can generate hot spots # for sequential insertion workloads. # - OrderPreservingPartitioner is an obsolete form of BOP, that stores # - keys in a less-efficient format and only works with keys that are # UTF8-encoded Strings. # - CollatingOPP colates according to EN,US rules rather than lexical byte # ordering. Use this as an example if you need custom collation. # # See <a href="http://wiki.apache.org/cassandra/Operations" rel="nofollow">http://wiki.apache.org/cassandra/Operations</a> for more on # partitioners and token selection. partitioner: org.apache.cassandra.dht.ByteOrderedPartitioner # directories where Cassandra should store data on disk. data_file_directories: - /home/elzorro/projects/cassandra/database/data # commit log commitlog_directory: /home/elzorro/projects/cassandra/database/commitlog # saved caches saved_caches_directory: /home/elzorro/projects/cassandra/database/saved_caches # Size to allow commitlog to grow to before creating a new segment commitlog_rotation_threshold_in_mb: 128 # commitlog_sync may be either "periodic" or "batch." # When in batch mode, Cassandra won't ack writes until the commit log # has been fsynced to disk. It will wait up to # CommitLogSyncBatchWindowInMS milliseconds for other writes, before # performing the sync. commitlog_sync: periodic # the other option is "periodic" where writes may be acked immediately # and the CommitLog is simply synced every commitlog_sync_period_in_ms # milliseconds. commitlog_sync_period_in_ms: 10000 # emergency pressure valve: each time heap usage after a full (CMS) # garbage collection is above this fraction of the max, Cassandra will # flush the largest memtables. # # Set to 1.0 to disable. Setting this lower than # CMSInitiatingOccupancyFraction is not likely to be useful. # # RELYING ON THIS AS YOUR PRIMARY TUNING MECHANISM WILL WORK POORLY: # it is most effective under light to moderate load, or read-heavy # workloads; under truly massive write load, it will often be too # little, too late. flush_largest_memtables_at: 0.75 # emergency pressure valve #2: the first time heap usage after a full # (CMS) garbage collection is above this fraction of the max, # Cassandra will reduce cache maximum _capacity_ to the given fraction # of the current _size_. Should usually be set substantially above # flush_largest_memtables_at, since that will have less long-term # impact on the system. # # Set to 1.0 to disable. Setting this lower than # CMSInitiatingOccupancyFraction is not likely to be useful. reduce_cache_sizes_at: 0.85 reduce_cache_capacity_to: 0.6 # Addresses of hosts that are deemed contact points. # Cassandra nodes use this list of hosts to find each other and learn # the topology of the ring. You must change this if you are running # multiple nodes! seeds: - 127.0.0.1 # Access mode. mmapped i/o is substantially faster, but only practical on # a 64bit machine (which notably does not include EC2 "small" instances) # or relatively small datasets. "auto", the safe choice, will enable # mmapping on a 64bit JVM. Other values are "mmap", "mmap_index_only" # (which may allow you to get part of the benefits of mmap on a 32bit # machine by mmapping only index files) and "standard". # (The buffer size settings that follow only apply to standard, # non-mmapped i/o.) disk_access_mode: auto # For workloads with more data than can fit in memory, Cassandra's # bottleneck will be reads that need to fetch data from # disk. "concurrent_reads" should be set to (16 * number_of_drives) in # order to allow the operations to enqueue low enough in the stack # that the OS and drives can reorder them. # # On the other hand, since writes are almost never IO bound, the ideal # number of "concurrent_writes" is dependent on the number of cores in # your system; (8 * number_of_cores) is a good rule of thumb. concurrent_reads: 16 concurrent_writes: 32 # This sets the amount of memtable flush writer threads. These will # be blocked by disk io, and each one will hold a memtable in memory # while blocked. If you have a large heap and many data directories, # you can increase this value for better flush performance. # By default this will be set to the amount of data directories defined. #memtable_flush_writers: 1 # Buffer size to use when performing contiguous column slices. # Increase this to the size of the column slices you typically perform sliced_buffer_size_in_kb: 64 # TCP port, for commands and data storage_port: 7000 # Address to bind to and tell other Cassandra nodes to connect to. You # _must_ change this if you want multiple nodes to be able to # communicate! # # Leaving it blank leaves it up to InetAddress.getLocalHost(). This # will always do the Right Thing *if* the node is properly configured # (hostname, name resolution, etc), and the Right Thing is to use the # address associated with the hostname (it might not be). # # Setting this to 0.0.0.0 is always wrong. listen_address: localhost # The address to bind the Thrift RPC service to -- clients connect # here. Unlike ListenAddress above, you *can* specify 0.0.0.0 here if # you want Thrift to listen on all interfaces. # # Leaving this blank has the same effect it does for ListenAddress, # (i.e. it will be based on the configured hostname of the node). rpc_address: localhost # port for Thrift to listen for clients on rpc_port: 9160 # enable or disable keepalive on rpc connections rpc_keepalive: true # Cassandra uses thread-per-client for client RPC. This can # be expensive in memory used for thread stack for a large # enough number of clients. (Hence, connection pooling is # very, very strongly recommended.) # # Uncomment rpc_min|max|thread to set request pool size. # You would primarily set max as a safeguard against misbehaved # clients; if you do hit the max, Cassandra will block until # one disconnects before accepting more. The defaults are # min of 16 and max unlimited. # # rpc_min_threads: 16 # rpc_max_threads: 2048 # uncomment to set socket buffer sizes on rpc connections # rpc_send_buff_size_in_bytes: # rpc_recv_buff_size_in_bytes: # Frame size for thrift (maximum field length). # 0 disables TFramedTransport in favor of TSocket. This option # is deprecated; we strongly recommend using Framed mode. thrift_framed_transport_size_in_mb: 15 # The max length of a thrift message, including all fields and # internal thrift overhead. thrift_max_message_length_in_mb: 16 # Set to true to have Cassandra create a hard link to each sstable # flushed or streamed locally in a backups/ subdirectory of the # Keyspace data. Removing these links is the operator's # responsibility. incremental_backups: false # Whether or not to take a snapshot before each compaction. Be # careful using this option, since Cassandra won't clean up the # snapshots for you. Mostly useful if you're paranoid when there # is a data format change. snapshot_before_compaction: false # change this to increase the compaction thread's priority. In java, 1 is the # lowest priority and that is our default. # compaction_thread_priority: 1 # Add column indexes to a row after its contents reach this size. # Increase if your column values are large, or if you have a very large # number of columns. The competing causes are, Cassandra has to # deserialize this much of the row to read a single column, so you want # it to be small - at least if you do many partial-row reads - but all # the index data is read for each access, so you don't want to generate # that wastefully either. column_index_size_in_kb: 64 # Size limit for rows being compacted in memory. Larger rows will spill # over to disk and use a slower two-pass compaction process. A message # will be logged specifying the row key. in_memory_compaction_limit_in_mb: 64 # Track cached row keys during compaction, and re-cache their new # positions in the compacted sstable. Disable if you use really large # key caches. compaction_preheat_key_cache: true # Time to wait for a reply from other nodes before failing the command rpc_timeout_in_ms: 10000 # phi value that must be reached for a host to be marked down. # most users should never need to adjust this. # phi_convict_threshold: 8 # endpoint_snitch -- Set this to a class that implements # IEndpointSnitch, which will let Cassandra know enough # about your network topology to route requests efficiently. # Out of the box, Cassandra provides # - org.apache.cassandra.locator.SimpleSnitch: # Treats Strategy order as proximity. This improves cache locality # when disabling read repair, which can further improve throughput. # - org.apache.cassandra.locator.RackInferringSnitch: # Proximity is determined by rack and data center, which are # assumed to correspond to the 3rd and 2nd octet of each node's # IP address, respectively # org.apache.cassandra.locator.PropertyFileSnitch: # - Proximity is determined by rack and data center, which are # explicitly configured in cassandra-topology.properties. endpoint_snitch: org.apache.cassandra.locator.SimpleSnitch # dynamic_snitch -- This boolean controls whether the above snitch is # wrapped with a dynamic snitch, which will monitor read latencies # and avoid reading from hosts that have slowed (due to compaction, # for instance) dynamic_snitch: true # controls how often to perform the more expensive part of host score # calculation dynamic_snitch_update_interval_in_ms: 100 # controls how often to reset all host scores, allowing a bad host to # possibly recover dynamic_snitch_reset_interval_in_ms: 600000 # if set greater than zero and read_repair_chance is < 1.0, this will allow # 'pinning' of replicas to hosts in order to increase cache capacity. # The badness threshold will control how much worse the pinned host has to be # before the dynamic snitch will prefer other replicas over it. This is # expressed as a double which represents a percentage. Thus, a value of # 0.2 means Cassandra would continue to prefer the static snitch values # until the pinned host was 20% worse than the fastest. dynamic_snitch_badness_threshold: 0.0 # request_scheduler -- Set this to a class that implements # RequestScheduler, which will schedule incoming client requests # according to the specific policy. This is useful for multi-tenancy # with a single Cassandra cluster. # NOTE: This is specifically for requests from the client and does # not affect inter node communication. # org.apache.cassandra.scheduler.NoScheduler - No scheduling takes place # org.apache.cassandra.scheduler.RoundRobinScheduler - Round robin of # client requests to a node with a separate queue for each # request_scheduler_id. The scheduler is further customized by # request_scheduler_options as described below. request_scheduler: org.apache.cassandra.scheduler.NoScheduler # Scheduler Options vary based on the type of scheduler # NoScheduler - Has no options # RoundRobin # - throttle_limit -- The throttle_limit is the number of in-flight # requests per client. Requests beyond # that limit are queued up until # running requests can complete. # The value of 80 here is twice the number of # concurrent_reads + concurrent_writes. # - default_weight -- default_weight is optional and allows for # overriding the default which is 1. # - weights -- Weights are optional and will default to 1 or the # overridden default_weight. The weight translates into how # many requests are handled during each turn of the # RoundRobin, based on the scheduler id. # # request_scheduler_options: # throttle_limit: 80 # default_weight: 5 # weights: # Keyspace1: 1 # Keyspace2: 5 # request_scheduler_id -- An identifer based on which to perform # the request scheduling. Currently the only valid option is keyspace. # request_scheduler_id: keyspace # The Index Interval determines how large the sampling of row keys # is for a given SSTable. The larger the sampling, the more effective # the index is at the cost of space. index_interval: 128 </code>