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
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."
ent major
versions.
Regards,
--
Mateusz Korniak
"(...) mam brata - poważny, domator, liczykrupa, hipokryta, pobożniś,
krótko mówiąc - podpora społeczeństwa."
Nikos Kazant
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
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 -
operations for months now without issue.
Regards,
--
Mateusz Korniak
.
Regards,
--
Mateusz Korniak
and swapping is disabled for cassandra binary.
- IO subsystem. kernel, io schedulers, performance of IO, HDDs
performance/errors.
--
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
.
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
?
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
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
. 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
, TSocket.pyo, TTransport.pyc, TTransport.pyo,
TTwisted.pyc, TTwisted.pyo, __init__.pyc, __init__.pyo
Regards,
--
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
/a 02963742
--
Mateusz Korniak
GB25.00%
85070591730234615865843651857942052864
[2]:
like twenty or more:
progress=0/2086059022 - 0%
progress=0/2085191380 - 0%
--
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
: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
On Tuesday 15 of February 2011, ruslan usifov wrote:
Is it possible to launch cassandra from unprivileged user?
On linux - yes.
--
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
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