RE: ConsitencyLevel and Mutations : Behaviour if the update of the commitlog fails

OK, thanks you. De : kurt greaves [mailto:k...@instaclustr.com] Envoyé : mardi 19 septembre 2017 06:35 À : User Objet : Re: ConsitencyLevel and Mutations : Behaviour if the update of the commitlog fails ​Does the coordinator "cancel" the mutation on the "committed" nodes (and how)? No. Those mu

ConsitencyLevel and Mutations : Behaviour if the update of the commitlog fails

Hi Cassandra users, I have a question about the ConsistencyLevel and the MUTATION operation. According to the write path documentation, the first action executed by a replica node is to write the mutation into the commitlog, the mutation is ACK only if this action is performed. I suppose that th

RE: Max Capacity per Node

Hi, I’m not a Cassandra expert but according this reference : http://docs.datastax.com/en/landing_page/doc/landing_page/planning/planningHardware.html#planningHardware__capacity-per-node You already reached (even exceeded) the recommended limit for HDD. As usual, I guess the maximum limits depen

RE: CsvReporter not spitting out metrics in cassandra

Hi, I configured this reporter recently thought the Apache Cassandra v2.1.x and I had no troubles. Here is some points to check : - The directory “/etc/dse/Cassandra” has to be in the classpath (I’m not a DSE user so I don’t know if it is already the case.) - If the CVSReport

RE: High read latency

Execution time of the GC Avg. 400ms. I do not see long pauses of GC anywhere in the log file. On Tue, Sep 22, 2015 at 5:34 AM, Leleu Eric mailto:eric.le...@worldline.com>> wrote: Hi, Before speaking about tuning, can you provide some additional information ? -

RE: High read latency

Hi, Before speaking about tuning, can you provide some additional information ? - Number of req/s - Schema details - JVM settings about the heap - Execution time of the GC 43ms for a read latency may be acceptable according to the number of request per s

RE: Cassandra Query using UDF

Hi, I'm not a Mongo user and I never used the Cassandra UDF feature but I found this (You may have already found it): https://issues.apache.org/jira/browse/CASSANDRA-8488 Eric -Message d'origine- De : Michael Scriney [mailto:mscri...@computing.dcu.ie] Envoyé : mercredi 16 septembre 20

RE: CPU consumption of Cassandra

possible cause. There is a little extra work but not anything that I think would be that obvious. tracing (can enable with nodetool) or profiling (ie with yourkit) can give more exposure to the bottleneck. Id run test from separate system first. --- Chris Lohfink On Sep 23, 20

RE : CPU consumption of Cassandra

tleneck. Collections will very likely hurt more then help. --- Chris Lohfink On Sep 23, 2014, at 9:39 AM, Leleu Eric mailto:eric.le...@worldline.com>> wrote: I tried to run “cassandra-stress” on some of my table as proposed by Jake Luciani. For a simple table, this tool is able to perform 8

RE: CPU consumption of Cassandra

LE but its really more of a wait state that may throw some profilers off, it may be a red haring. --- Chris Lohfink On Sep 22, 2014, at 11:39 AM, Leleu Eric mailto:eric.le...@worldline.com>> wrote: Hi, I'm currently testing Cassandra 2.0.9 (and since the last week 2.1) under some

CPU consumption of Cassandra

Hi, I'm currently testing Cassandra 2.0.9 (and since the last week 2.1) under some read heavy load... I have 2 cassandra nodes (RF : 2) running under CentOS 6 with 16GB of RAM and 8 Cores. I have around 93GB of data per node (one Disk of 300GB with SAS interface and a Rotational Speed of 105

Question about MemoryMeter liveRatio

Hi, I'm trying to understand what is the liveRatio and if I have to care about it. I found some reference on the web and if I understand them, the liveRatio represents the Memtable size divided by the amount of data serialized on the disk. Is it the truth? When I see the following log, what

RE: Secondary index or dedicated CF?

best thing to do is to benchmark both solutions and takes the approach giving you the best results. Be careful with benchmarks, it should be representative of the data pattern you likely have in production. On Fri, Aug 22, 2014 at 7:47 AM, Leleu Eric mailto:eric.le...@worldline.com>> wrote:

Secondary index or dedicated CF?

Hi, I'm new with Cassandra and I wondering what is the best design for my case. I have a set of buckets that contain one or thousands of contents. Here is my Content CF : CREATE TABLE IF NOT EXISTS contents (tenantID varchar, key varchar, type varchar, bucket varchar, owne