nodetool

问题 From the documentation: Using the nodetool repair -pr (–partitioner-range) option repairs only the primary range for that node, the other replicas for that range still have to perform the Merkle tree calculation, causing a validation compaction. Because all the replicas are compacting at the same time, all the nodes may be slow to respond for that portion of the data . There is probably never a time where I can accept all nodes to be slow for a certain portion of the data. But I wonder: Why

问题 From the documentation: Using the nodetool repair -pr (–partitioner-range) option repairs only the primary range for that node, the other replicas for that range still have to perform the Merkle tree calculation, causing a validation compaction. Because all the replicas are compacting at the same time, all the nodes may be slow to respond for that portion of the data . There is probably never a time where I can accept all nodes to be slow for a certain portion of the data. But I wonder: Why

问题 From the documentation: Using the nodetool repair -pr (–partitioner-range) option repairs only the primary range for that node, the other replicas for that range still have to perform the Merkle tree calculation, causing a validation compaction. Because all the replicas are compacting at the same time, all the nodes may be slow to respond for that portion of the data . There is probably never a time where I can accept all nodes to be slow for a certain portion of the data. But I wonder: Why

问题 I've got a problem with monitoring my Cassandra node. I ran nodetool cfstats keyspaceName.tableName Unfortunately Read Count is always 0 and Read Latency is NaN. I am doing reads and writes but only writes metrics are updated. Here is what I got as an output: Starting NodeTool Keyspace: realtimetrader Read Count: 0 Read Latency: NaN ms. Write Count: 402 Write Latency: 0.09648756218905473 ms. Pending Flushes: 0 Table: currencies SSTable count: 1 Space used (live): 5254 Space used (total): 5254

问题 We have a big Cassandra cluster 18 Servers (on one server near 5T data ) http://docs.datastax.com/en/cassandra/2.0/cassandra/operations/ops_add_node_to_cluster_t.html - We have added a new nodes following this documentation . After we have added new servers, we began the process of cleaning data (nodetool cleanup) In the documentation advise: After all new nodes are running, run nodetool cleanup on each of the previously existing nodes to remove the keys no longer belonging to those nodes.

问题 To remove a node from 2 node cluster in AWS I ran nodetool removenode <Host ID> After this I was supposed to get my cluster back if I put all the cassandra.yaml and cassandra-rackdc.properties correctly. I did it but still, I am not able to get back my cluster. nodetool status is displaying only one node. significant system.log on cassandra is : INFO [main] 2017-08-14 13:03:46,409 StorageService.java:553 - Cassandra version: 3.9 INFO [main] 2017-08-14 13:03:46,409 StorageService.java:554 -

问题 To remove a node from 2 node cluster in AWS I ran nodetool removenode <Host ID> After this I was supposed to get my cluster back if I put all the cassandra.yaml and cassandra-rackdc.properties correctly. I did it but still, I am not able to get back my cluster. nodetool status is displaying only one node. significant system.log on cassandra is : INFO [main] 2017-08-14 13:03:46,409 StorageService.java:553 - Cassandra version: 3.9 INFO [main] 2017-08-14 13:03:46,409 StorageService.java:554 -

问题 I am trying to setup environment variables so that any user on a particular server can run commands like nodetool or cqlsh from any where in linux file system . The effort to traverse to bin directory everytime should be saved . How can we achieve this ? My DSE 4.8 is a tarball install . 回答1: Nodetool is usually available to any user that has execution privileges in your linux boxes For cqlsh, you can set any configuration inside the cqlshrc file (usually found in $HOME/.cassandra/cqlshrc; we

问题 I`m using Cassandra dsc 2.1.5 with 3 nodes, and the following table description: cqlsh> DESCRIBE TABLE mykeyspace.mytable; CREATE TABLE mykeyspace.mytable ( a text, b text, c timestamp, d timestamp, e text, PRIMARY KEY ((a, b), c) ) WITH CLUSTERING ORDER BY (c ASC) AND bloom_filter_fp_chance = 0.01 AND caching = '{"keys":"ALL", "rows_per_partition":"NONE"}' AND comment = '' AND compaction = {'min_threshold': '4', 'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max

问题 Recently I've started working on Grails integration with Cassandra using the Java driver for cassandra(cassandra-driver-core-2.0.2). So I was curious to know how we can find out how much size our table is taking to store the data in cassandra DB. I have created a keyspace with name Customkeyspace and a column family called Movie in it. So I was curious to know which tool/Command I have to use to know the size of the keyspace/Column family ? 回答1: To get statistics regarding column families in