Does Cassandra support running on Java 8?

Are there any official recomendations, validations/tests done with Cassandra >= 2.0 on Java 8? Regards /Fredrik

Performance Issue: Keeping rows in memory

Hi, I'm working on an application using a Cassandra (2.1.0) cluster where - our entire dataset is around 22GB - each node has 48GB of memory but only a single (mechanical) hard disk - in normal operation we have a low level of writes and no reads - very occa

Question on how to run incremental repairs

I'm having problems understanding how incremental repairs are supposed to be run. If I try to do "nodetool repair -inc" cassandra will complain that "It is not possible to mix sequential repair and incremental repairs". However it seems that running "nodetool repair -inc -par" does the job, but I

Re: Question on how to run incremental repairs

On Wed, Oct 22, 2014 at 2:39 PM, Juho Mäkinen wrote: > I'm having problems understanding how incremental repairs are supposed to > be run. > > If I try to do "nodetool repair -inc" cassandra will complain that "It is > not possible to mix sequential repair and incremental repairs". However it > s

Cluster/node with inconsistent schema

Hi, I have a table that I dropped, recreated with two clustering primary keys (only had a single partition key before), and loaded previous data into the table. I started noticing that a single node of mine was not able to do `ORDER BY` executions on the table (while the other nodes were). Wh

Re: Cassandra Restore data from snapshots and Different Counts

I assume that you are restoring snapshot data onto a new ring with the same topology (i.e. if the old ring has n nodes, your new ring has n nodes also). I discussed this a consultant from DataStax, and he told me that I need to make sure each new node in the new ring need to have the same token lis

Re: Cluster/node with inconsistent schema

Hi again, Follow-up: The incorrect schema propagated to other servers. Luckily this was a smaller table. I dropped the table and noticed that no sstables were removed. I then created the table again, and truncated it instead. This removed all the sstables and things look good now. Cheers

Re: Performance Issue: Keeping rows in memory

If you're using 2.1.0 the row cache has been redesigned. How did you configure it ? There is some new parameters to specify how many "CQL rows" you want to keep in the cache: http://www.datastax.com/dev/blog/row-caching-in-cassandra-2-1 On Wed, Oct 22, 2014 at 1:34 PM, Thomas Whiteway < thomas.whi

RE: stream_throughput_outbound_megabits_per_sec

Sorry, I copy-and-pasted the wrong variable name. I meant to copy and paste streaming_socket_timeout_in_ms. So my question should be: streaming_socket_timeout_in_ms is the timeout per operation on the streaming socket. The docs recommend not to set it too low (because a timeout causes strea

Is cassandra smart enough to serve Read requests entirely from Memtables in some cases?

Question about the read path in cassandra. If a partition/row is in the Memtable and is being actively written to by other clients, will a READ of that partition also have to hit SStables on disk (or in the page cache)? Or can it be serviced entirely from the Memtable? If you select all colu

Re: Performance Issue: Keeping rows in memory

First, did you run a query trace? I recommend Al Tobey's pcstat util to determine if your files are in the buffer cache: https://github.com/tobert/pcstat On Wed, Oct 22, 2014 at 4:34 AM, Thomas Whiteway wrote: > Hi, > > > > I’m working on an application using a Cassandra (2.1.0) cluster where

Re: Is cassandra smart enough to serve Read requests entirely from Memtables in some cases?

No. Consider a scenario where you supply a timestamp a week in the future, flush it to sstable, and then do a write, with the current timestamp. The record in disk will have a timestamp greater than the one in the memtable. On Wed, Oct 22, 2014 at 9:18 AM, Donald Smith < donald.sm...@audiencesci

RE: Performance Issue: Keeping rows in memory

I was using the pre-2.1.0 configuration scheme of setting caching to ‘rows_only’ on the column family. I’ve tried runs with row_cache_size_in_mb set to both 16384 and 32768. I don’t think the new settings would have helped in my case. My understanding of the rows_per_partition setting is tha

RE: Is cassandra smart enough to serve Read requests entirely from Memtables in some cases?

On the cassandra irc channel I discussed this question. I learned that the timestamp in the Memtable may be OLDER than the timestamp in some SSTable (e.g., due to hints or retries). So there’s no guarantee that the Memtable has the most recent version. But there may be cases, they say, in whi

RE: Performance Issue: Keeping rows in memory

I haven't tried running a query trace. I'm pretty confident that the difference in performance during the test is due to whether the files are cached or not as - if I explicitly empty the page cache before the test I get a 5 minute slow period - if I leave a few hours between tests but don't d

Copy Error

Hey folks, I am sure that this is a simple oversight on my part, but I just can not see the forest for the trees. Any ideas on this one? copy strevus_data.strevus_metadata_data to 'c:/temp/strevus/export/strevus_data.strevus_metadata_data.csv'; Bad Request: Undefined name 00080

Re: Increasing size of "Batch of prepared statements"

Shabab, Apologize for the late answer. On Mon, Oct 6, 2014 at 2:38 PM, shahab wrote: > But do you mean that inserting columns with large size (let's say a text > with 20-30 K) is potentially problematic in Cassandra? AFAIK, the size _warning_ you are getting relates to the size of the batch o

Re: Performance Issue: Keeping rows in memory

On Wed, Oct 22, 2014 at 4:34 AM, Thomas Whiteway < thomas.white...@metaswitch.com> wrote: > I’m working on an application using a Cassandra (2.1.0) cluster where > > - our entire dataset is around 22GB > > - each node has 48GB of memory but only a single (mechanical) > hard dis

Re: Copy Error

What's your schema for that table, and what version of Cassandra are you using? On Wed, Oct 22, 2014 at 12:25 PM, Jeremy Franzen wrote: > Hey folks, > > I am sure that this is a simple oversight on my part, but I just can not > see the forest for the trees. Any ideas on this one? > > copy st

Re: Cassandra Restore data from snapshots and Different Counts

On Wed, Oct 22, 2014 at 7:58 AM, Li, George wrote: > I assume that you are restoring snapshot data onto a new ring with the > same topology (i.e. if the old ring has n nodes, your new ring has n nodes > also). I discussed this a consultant from DataStax, and he told me that I > need to make sure

Re: Question on how to run incremental repairs

On Wed, Oct 22, 2014 at 5:47 AM, Marcus Eriksson wrote: > > no, if you get a corrupt sstable for example, you will need to run an old > style repair on that node (without -inc). > As a general statement, if you get a corrupt SSTable, restoring it from a backup (with the node down) should be done

Re: Does Cassandra support running on Java 8?

On 10/22/2014 02:42 AM, Fredrik wrote: Are there any official recomendations, validations/tests done with Cassandra >= 2.0 on Java 8? We've been running JDK8 dtest jenkins jobs on the cassandra-2.1 branch for a while, I recently added a trunk_dtest_jdk8 job, and I just now added unit test job

Re: Does Cassandra support running on Java 8?

On 10/22/2014 03:14 PM, Michael Shuler wrote: On 10/22/2014 02:42 AM, Fredrik wrote: Are there any official recomendations, validations/tests done with Cassandra >= 2.0 on Java 8? We've been running JDK8 dtest jenkins jobs on the cassandra-2.1 branch for a while, I recently added a trunk_dtest

Re: Copy Error

We are dropping the Copy command and just going with the sstableloader command instead. Sorry for the noise on the channel. Jeremy J. Franzen VP Operations | Strevus jeremy.fran...@strevus.com T: +1.415.649.6234 | M: +1.408.726.4363 Compliance Made Easy. ... . -- .--. . .-. / ..-. .. From: Ty

Re: Copy Error

For the sake of fixing a potential bug, would you mind sharing your schema and Cassandra version anyway? On Wed, Oct 22, 2014 at 4:49 PM, Jeremy Franzen wrote: > We are dropping the Copy command and just going with the sstableloader > command instead. Sorry for the noise on the channel. > > >

Cassandra Developer - Choice Hotels

Hi, I am hoping to get the word out that we are looking for a Cassandra Developer for a full time position at our office in Scottsdale, AZ. Please let me know what I can do to let folks know we are looking :)

Empty cqlsh cells vs. null

Hi, Not sure this is a Datastax specific question to be asked elsewhere. In that case, let me know. Anyway, I have populated a Cassandra table from DSE Hive. When I fire up cqlsh and execute a SELECT against the table I have columns of INT type that are empty. At first I thought these were nu