Re: storing indexes on ssd

2018-02-12 Thread Mateusz Korniak
gt; 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, hipokryta, po

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

2017-07-21 Thread Mateusz Korniak
ong 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

2017-05-16 Thread Mateusz Korniak
ent major versions. Regards, -- Mateusz Korniak "(...) mam brata - poważny, domator, liczykrupa, hipokryta, pobożniś, krótko mówiąc - podpora społeczeństwa." Nikos Kazant

Re: cassandra disks cache on SSD

2016-04-03 Thread Mateusz Korniak
On Friday 01 April 2016 21:48:08 vincent gromakowski wrote: > 2016-04-01 19:27 GMT+02:00 Mateusz Korniak <mateusz-li...@ant.gliwice.pl>: > > We are using lvmcache for that. > > Can you provide me a approximate estimation of performance gain ? I suspect it depends on freq

Re: cassandra disks cache on SSD

2016-04-01 Thread Mateusz Korniak
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?

2012-10-10 Thread Mateusz Korniak
operations for months now without issue. Regards, -- Mateusz Korniak

Re: lost keyspace

2012-08-08 Thread Mateusz Korniak
. Regards, -- Mateusz Korniak

Re: Cassandra 1.0 hangs during GC

2012-07-30 Thread Mateusz Korniak
and swapping is disabled for cassandra binary. - IO subsystem. kernel, io schedulers, performance of IO, HDDs performance/errors. -- Mateusz Korniak

Re: Cassandra 1.0 hangs during GC

2012-07-30 Thread Mateusz Korniak
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

How schema disagreement can be fixed faster on 1.0.10 cluster ?

2012-07-26 Thread Mateusz Korniak
. 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

2012-06-14 Thread Mateusz Korniak
? 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

2012-03-28 Thread Mateusz Korniak
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 brata - poważny, domator

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

2012-03-15 Thread Mateusz Korniak
. 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

2012-02-22 Thread Mateusz Korniak
, 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

2012-01-09 Thread Mateusz Korniak
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, at 8:20 PM, Mateusz Korniak wrote: Hi ! I

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

2012-01-08 Thread Mateusz Korniak
/a 02963742 -- Mateusz Korniak

Re: Strange nodetool repair behaviour

2011-04-04 Thread Mateusz Korniak
GB25.00% 85070591730234615865843651857942052864 [2]: like twenty or more: progress=0/2086059022 - 0% progress=0/2085191380 - 0% -- Mateusz Korniak

[0.7.2] Compacting exception

2011-03-18 Thread Mateusz Korniak
) 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.init(SSTableIdentityIterator.java:70) ... 20 more -- Mateusz Korniak

Re: [0.7.2] Compacting exception

2011-03-18 Thread Mateusz Korniak
:44 AM, Mateusz Korniak mateusz-li...@ant.gliwice.pl 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 I find which one exactly ? 2

Re: Cassandra from unprivileged user

2011-02-15 Thread Mateusz Korniak
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]

2011-01-04 Thread Mateusz Korniak
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