Re: Java GC pauses, reality check

Hi Hari Could you share your G1GC settings please? On Sun, Nov 27, 2016 at 9:57 PM, Harikrishnan Pillai < hpil...@walmartlabs.com> wrote: > Hi @Kant Kodali, > > We have multiple clusters running zing . > > One cluster has 11/11 and another one also has 11/11.(190 GB mem,6TB hard > disk and 16 Ph

Compactions

Does Cassandra use mmap during reading and writing phase of compaction? -- Cheers Bill

Bootstrap code

Hi All Can someone please point me to where the code for bootstrapping a new node exists? -- Cheers Bill

Paxos in 1.2

What is Paxos used for? Only CAS related operations?

sorting columns by time

Hi All I have a requirement where I need to have my columns sorted by the creation time. However I would like to have my own naming scheme for the columns and not use TimeUUID as column names. Please advice as to how I can achieve this in Cassandra as this has been pretty confusing to me.

C++ Thrift client

Hi All I am doing very small inserts into Cassandra in the range of say 64 bytes. I use a C++ Thrift client and seem consistently get latencies anywhere between 35-45 ms. Could some one please advise as to what might be happening? thanks

Bloom Filters in Cassandra

How are bloom filters used in Cassandra? Is my understanding correct in that there is one per SSTable encapsulating what keys are in the SSTable? Please advise.

Bootstrap code path

Could someone please tell me where I should start looking at code to understand how cassandra bootstrap process works? I am sure it is complicated but I have time. Also is my understanding correct that the new nodes that are added are not joining the ring till the bootstrap process is complete i.e

How does NetworkStrategy work?

If I have a replication factor set up as 3 and I want data replicated across data centers would I get 3 replicas per DC or is each replica placed in a different Data centers?

Range scan

How does range scan work in Cassandra? Does the read of a key perform the read across all the SSTables that contain the key and return the row or are SSTables processed sequentially? If I have a key k and its columns are spread across N SSTables then does the read of key k return the row with all t

checksumming

Are checksum errors detected in Cassandra and if so how are they resolved?

Re: Cassandra-2252

This > is the Nth time :). > > Avinash > > > On Tue, Aug 2, 2011 at 8:17 PM, Bill Hastings wrote: > >> Is this part of trunk and used? I see the code for MemtableAllocator but I >> don't see it being used. >> >> Avinash >> > >

Cassandra-2252

Is this part of trunk and used? I see the code for MemtableAllocator but I don't see it being used. Avinash

Maybe OT

I was wondering if the datastax folks could please share their settings for the thrift build. We would like to make some additions/changes to thrift and have basic build issues. Not much support in their avenues it looks like. -- Cheers Bill

memory utilization

Hi All Memory utilization reported by JCOnsole for Cassandra seems to be much lesser than that reported by top ("RES" memory). Can someone explain this? Maybe off topic but would appreciate a response. -- Cheers Bill

Re: Commit log files

> On 22 Oct 2010, at 03:40, Bill Hastings wrote: > > > Does Cassandra maintain a commit log per table? Or are they co-mingled? > > > > -- > > Cheers > > Bill > > -- Cheers Bill

Commit log files

Does Cassandra maintain a commit log per table? Or are they co-mingled? -- Cheers Bill

Map/Reduce over Cassandra

Hi All How performant is M/R on Cassandra when compared to running it on HDFS? Anyone have any numbers they can share? Specifically how much of data the M/R job was run against and what was the throughput etc. Any information would be very helpful. -- Cheers Bill

Re: The stability of Hadoop jobs outputting to Cassandra

I am curious to know the reasons you are moving away from HBase. It would be great if you could state them. On Sun, Aug 15, 2010 at 4:24 PM, Keith Stevens wrote: > Hello, > > I'm currently working on a project that is using HBase and Hadoop, but i'm > currently looking into alternatives to HBase.

Re: Newbie to cassandra

Or perhaps this one. This is the Cassandra paper from the guys at FB. http://www.cs.cornell.edu/projects/ladis2009/program.htm#session3 On Sun, Jul 18, 2010 at 1:21 PM, Jonathan Ellis wrote: > Start with the "recommended" articles on > http://wiki.apache.org/cassandra/ArticlesAndPresentation

0.7 source code

Where can I find it? -- Cheers Bill

Bootstrap source code

Hi I have looking at the bootstrap source and seem to understand it for the most part. This is what I do not follow: (1) New node joins and doesn't advertise its token. (2) Requests nodes to send it data. The nodes that need to send it data first flush memtables and then transfer SSTables. Once