Re: cold vs hot data

re efficient? > Is there a way to somehow automatically move the old data to different > storage (rack, dc, etc)? > Any ideas? We solved it using lvmcache. -- Mateusz (...) mam brata - poważny, domator, liczykrupa, hipokryta, pobożniś, krótko mówiąc - podpora społeczeństwa.&q

Re: storing indexes on ssd

e we are > doing 2 random reads (index + data). Considered putting cassandra data on lvmcache? We are using this on small (3x2TB compressed data, 128/256MB cache) clusters since reaching I/O limits of 2xHDD in RAID10. -- Mateusz Korniak "(...) mam brata - poważny, domator, liczykrupa, hip

Re: Is it safe to upgrade between minor releases without first performing a repair?

cy among nodes, you may get different query results (old/missing data, etc...) during node restarts. -- Mateusz Korniak "(...) mam brata - poważny, domator, liczykrupa, hipokryta, pobożniś, krótko mówiąc - podpora społeczeństwa."

Re: Bootstraping a Node With a Newer Version

ent major versions. Regards, -- Mateusz Korniak "(...) mam brata - poważny, domator, liczykrupa, hipokryta, pobożniś, krótko mówiąc - podpora społeczeństwa." Nikos Kazantzakis - "Grek Zorba" ---

Re: cassandra disks cache on SSD

On Friday 01 April 2016 21:48:08 vincent gromakowski wrote: > 2016-04-01 19:27 GMT+02:00 Mateusz Korniak : > > We are using lvmcache for that. > > Can you provide me a approximate estimation of performance gain ? I suspect it depends on frequently read data size. If it fits int

Re: cassandra disks cache on SSD

On Friday 01 April 2016 13:16:53 vincent gromakowski wrote: > (...) looking > for a way to use some kind of tiering with few SSD caching hot data from > HDD. > I have identified two solutions (...) We are using lvmcache for that. Regards, -- Mateusz Korniak "(...) mam brata -

Re: can I have a mix of 32 and 64 bit machines in a cluster?

r our daily operations for months now without issue. Regards, -- Mateusz Korniak

Re: lost keyspace

ame schema version on all nodes first. Regards, -- Mateusz Korniak

Re: Cassandra 1.0 hangs during GC

up to numbers you presented ( many seconds)... [2]: INFO [main] 2012-07-27 12:18:27,135 CLibrary.java (line 109) JNA mlockall successful -- Mateusz Korniak

Re: Cassandra 1.0 hangs during GC

Networking > - What else??? - JNA. If it's working and swapping is disabled for cassandra binary. - IO subsystem. kernel, io schedulers, performance of IO, HDDs performance/errors. -- Mateusz Korniak

How schema disagreement can be fixed faster on 1.0.10 cluster ?

. 3. Than stop cassandra, 4. Copy files back. 5. Start cassandra. Will it work ? Extra option is to disable thrift during above process (can it be done in config ? In cassandra.yaml rpc_port: 0 ? ) Thanks in advance for any hints, regards, -- Mateusz Korniak

Meaning of compression chunk_length_kb

compressed range ? Or it means approximately chunk_length_kb of sstable data is compressed and stored on disk, so similar values must be in chunk_length_kb range to make compression efficient ? Or something else ? Thanks in advance, regards, -- Mateusz Korniak

Re: Advice on architecture

DDs 4x smaller should be twice faster in reads than 2x bigger. > Should I use hardware raid or linux raid is ok? Instead of buying hardware raids buy more disks/nodes - should give more performance gain. > I mostly concerned with read performance. -- Mateusz Korniak "(...) mam

Re: Bootstrapping a new node to a running cluster (setting RF > N)

another > node. If it is sent to the new node (at CL ONE) the read will fail. If you > are running at a high CL it will always involve the old nodes. 4. Update > the RF to 4. Every node is now a replica for every key. > 5. Roll back the CL change. > 6. Repair the new node. > 7. Turn on the clients for the new node. Regards, -- Mateusz Korniak

Re: Doubt regarding CQL

, THttpClient.pyo, TSocket.pyc, TSocket.pyo, TTransport.pyc, TTransport.pyo, TTwisted.pyc, TTwisted.pyo, __init__.pyc, __init__.pyo Regards, -- Mateusz Korniak

Re: [0.8.x] Node join stuck with all network transfers done

the logs on .17 for errors. No exceptions, just "Finished streaming session", netstats empty, node idling (net, cpu, io ) and rising number of pending tasks without doing anything. Big thanks for caring to answer, regards ! > http://www.thelastpickle.com > > On 9/01/2012

[0.8.x] Node join stuck with all network transfers done

nses n/a 02963742 -- Mateusz Korniak

Re: Strange nodetool repair behaviour

Up Normal 12.13 GB25.00% 85070591730234615865843651857942052864 [2]: like twenty or more: progress=0/2086059022 - 0% progress=0/2085191380 - 0% -- Mateusz Korniak

Re: [0.7.2] Compacting exception

Mar 18, 2011 at 6:44 AM, Mateusz Korniak > > wrote: > > Hi ! > > I have run with Cassandra 0.7.2 out of disc space and after moving to > > bigger partition I experience compaction failures[1]. > > > > 1) I suspect one of SSTables is broken. If I am right how can

[0.7.2] Compacting exception

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) Caused by: java.io.EOFException at org.apache.cassandra.io.sstable.IndexHelper.skipIndex(IndexHelper.java:65) at org.apache.cassandra.io.sstable.SSTableIdentityIterator.(SSTableIdentityIterator.java:70) ... 20 more -- Mateusz Korniak

Re: Cassandra from unprivileged user

On Tuesday 15 of February 2011, ruslan usifov wrote: > Is it possible to launch cassandra from unprivileged user? On linux - yes. -- Mateusz Korniak

Reading data problems during bootstrap. [pycassa 0.7.0 rc4]

approach or there is better one ? question 4: I hoped that during above operations I would be able to _read_ whole dataset as it was at beginning in one node cluster, is it possible ? Thanks in advance for any answers, regards, -- Mateusz Korniak