Re: Cassandra documentation (and in this case the datastax anti-entropy docs)

[Diallo Mamadou Bobo]

Hi.
I also believe that wiki are not so good for a community managed wiki even 
thought it is used as "de facto" tool for opensource projects doc.

I suggest that we use drupal's book module, it is really full featured and easy 
to use.

I would be happy to do some wireframing and set-up a demo if neccessary.


Envoyé de mon iPhone

Le 1 avr. 2011 à 01:27, Nick Telford  a écrit :

> I agree that wikis are great for contribution; what I meant was that they're
> rather poor at organising information for ease of discovery, especially by
> new users.
> 
> I still like the idea of some more structured docs being managed by the
> community though.
> 
> On 1 April 2011 02:16, Eric Evans  wrote:
> 
>> On Thu, 2011-03-31 at 18:57 +0100, Nick Telford wrote:
>>> I don't think the Wiki is the right place for community maintained
>>> user docs; it doesn't have the necessary structure.
>> 
>> The wiki is great at what wikis are great at, lowering the barrier to
>> contribution.  There is a lot of good stuff (some of it is even
>> translated to other languages!); I'm guessing there would be much less
>> if people had to jump through more hoops.
>> 
>>> Perhaps some generated docs maintained in-tree and hosted somewhere on
>>> cassandra.apache.org might be an idea? This would also enforce some
>>> order over changes made to them as changes would be controlled by
>>> committers and managed through JIRA.
>> 
>> I had this exact idea, I even checked the CQL language documentation
>> into the tree as doc/cql/CQL.textile.  I had expected that to either set
>> a precedent, or to be told to get it out of there, but neither
>> happened. :)
>> 
>> I don't think we need to choose one or the other.  If someone would
>> rather add documentation to the wiki, we should let them (thank them
>> even).  People interested in something maintained with more rigor can
>> invite the wiki peeps to submit patches, and steal their content if they
>> won't!
>> 
>> --
>> Eric Evans
>> eev...@rackspace.com
>> 
>> 

Build failed in Jenkins: Cassandra-0.7 #417

[Apache Hudson Server]

See 

Changes:

[jbellis] revert whirr change, it's for 0.8 only

[jbellis] upgrade to whirr 0.4
patch by Pavel Yaskevich for CASSANDRA-2265

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[junit]  WARN 08:11:58,137 Generated random token 
Token(bytes[e48f5dd51190b38480b15c67f7ef5226]). Random tokens will result in an 
unbalanced ring; see http://wiki.apache.org/cassandra/Operations
[junit] -  ---
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[junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 1.381 sec
[junit] 
[junit] - Standard Error -
[junit]  WARN 08:12:20,175 Invalid file '.svn' in data directory 

[junit]  WARN 08:12:20,774 Invalid file '.svn' in data directory 

[junit] -  ---
[junit] Testsuite: org.apache.cassandra.io.sstable.SSTableReaderTest
[junit] Tests run: 3, Failures: 0, Errors: 0, Time elapsed: 0.823 sec
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Some thoughts on client abstraction and connection pooling

[Nick Telford]

Hi everyone,

While prototyping ideas for the PHP CQL driver, I started thinking about
client responsibilities that are agnostic of the underlying transport (be it
Thrift, Avro or an arbitrary binary protocol) and indeed the client's
interface, e.g. Thrift API or CQL.

Drivers for most databases (e.g. MySQL, Mongo, Oracle etc.) connect to a
node, specified by hostname and port. Obviously, as a distributed database,
the last thing we want is clients all connecting to the same node when we
can more efficiently load balance them across the cluster. At present, all
high-level clients have to tackle this problem and they do so in a variety
of different ways. But this is something that has nothing to do with the
client API - it's a configuration concern.

So my thought is: we define a standard means for clients to be configured
with information about the cluster topology, we then create language
abstractions for using this configuration to select the most appropriate
node to connect to on-demand and, most importantly, we expose the cluster to
the high-level API as a single entity that it connects to. The high-level
client can focus on it's job, and the currently disparate boilerplate gets
unified into something much-improved. We could also do similar things for
connection fail-over policies, although that would likely be a part of the
selection policy.

I've already had some ideas on how best to implement such an abstraction:
Using a Strategy Pattern to define different selection policies, (e.g.
"Random" and "NetworkTopologyAware") would parallel the internal
ReplicaPlacementStrategy's nicely in how they route client connections.

I haven't really come to any concrete conclusions about this yet, but I
wanted to open this up to discussion among the various client devs to see
what you think. Would such an abstraction be useful? Is this something worth
pursuing?
--
Nick Telford

Added a wiki page for people having issues building...

[Stephen Connolly]

http://wiki.apache.org/cassandra/HowToBuild

A number of people have had issues building Cassandra...

Things like:
1. Not using ANT 1.8 or newer (you might get away with 1.7 though but
1.6 is a no go)
2. Not using JDK 1.6 or newer (you might get part of the way with 1.5
as that is the required minimum for Maven ANT tasks, but Cassandra
depends on 1.6 classes... trying to build with GCJ ain't going to
work)
3. Not having an internet connection to download the dependencies initially.
4. Not having proxy settings configured for ANT.

-Stephen

Build failed in Jenkins: Cassandra #823

[Apache Hudson Server]

See 

Changes:

[jbellis] move stress package from o.a.c.contrib to o.a.c

[jbellis] move example code from contrib/ to examples/, and tools from contrib/ 
to tools/

[jbellis] Revert incomplete move of sstable [ex/im]port code

[jbellis] upgrade to whirr 0.4
patch by Pavel Yaskevich for CASSANDRA-2265

[jbellis] modernize column name quoting

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Build failed in Jenkins: Cassandra #824

[Apache Hudson Server]

See 

Changes:

[jbellis] really revert SSTableExport move

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[junit] - Standard Error -
[junit]  WARN 11:15:11,472 Invalid file '.svn' in data directory 

[junit]  WARN 11:15:12,077 Invalid file '.svn' in data directory 

[junit] -  ---
[junit] Testsuite: org.apache.cassandra.io.sstable.SSTableReaderTest
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[junit] Tests run: 7, Failures: 0, Errors: 0, Time elapsed: 0.964 sec
[junit] 
[junit] - Standard Error -
[junit]  WARN 11:15:34,604 Generated random token 
Token(bytes[dc4d749ede3b069db313d6190af00486]). Random tokens will result in an 
unbalanced ring; see http://wiki.apache.org/cas

Build failed in Jenkins: Cassandra #825

[Apache Hudson Server]

See 

Changes:

[jbellis] isFrozen needs to be volatile

[jbellis] revert #1954 for now

[jbellis] r/m unused code

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[junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 1.345 sec
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[junit] - Standard Error -
[junit]  WARN 16:14:23,799 Invalid file '.svn' in data directory 

[junit]  WARN 16:14:24,406 Invalid file '.svn' in data directory 

[junit] -  ---
[junit] Testsuite: org.apache.cassandra.io.sstable.SSTableReaderTest
[junit] Tests run: 3, Failures: 0, Errors: 0, Time elapsed: 0.772 sec
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[junit] 
[junit] Testsuite: org.apache.cassandra.io.util.BufferedRandomAccessFileTest
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[junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 6.122 sec
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[junit] Tests run: 2, Failures: 0, Errors: 0, Time elapsed: 0.385 sec
[junit] 
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org.apache.cassandra.locator.OldNetworkTopologyStrategyTest
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[junit] Tests run: 4, Failures: 0, Errors: 0, Time elapsed: 0.537 sec
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[junit] Testsuite: org.apache.cassandra.locator.TokenMetadataTest
[junit] Tests run: 3, Failures: 0, Errors: 0, Time elapsed: 0.367 sec
[junit] 
[junit] Testsuite: 
org.apache.cassandra.service.AntiEntropyServiceCounterTest
[junit] Tests run: 7, Failures: 0, Errors: 0, Time elapsed: 0.952 sec
[junit] 
[junit] - Standard Error -
[junit]  WARN 16:14:46,608 Generated random token 
Token(bytes[c502071cd53c210024f440bf688e8b24]). Random tokens will resul

Build failed in Jenkins: Cassandra-0.7-Coverage #17

[Apache Hudson Server]

See 

Changes:

[jbellis] revert whirr change, it's for 0.8 only

[jbellis] upgrade to whirr 0.4
patch by Pavel Yaskevich for CASSANDRA-2265

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org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
[junit] ... 3 more
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[junit] Cobertura: Loaded information on 1002 classes.
[junit] Cobertura: Saved information on 1002 classes.
[junit] Testsuite: org.apache.cassandra.service.CassandraServerTest
[junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 0.485 sec
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[junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 0.756 sec
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[junit] Cobertura: Saved information on 1002 classes.
[junit] Testsuite: org.apache.cassandra.service.EmbeddedCassandraServiceTest
[junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 1.051 sec
[junit] 
[junit] - Standard Error -
[junit]  WARN 17:28:20,319 Unable to lock JVM memory (ENOMEM). This can 
result in part of the JVM being swapped out, especially with mmapped I/O 
enabled. Increase RLIMIT_MEMLOCK or run Cassandra as root.
[junit]  WARN 17:28:20,703 Generated random token 
Token(bytes[3d09b201c50855602026584372928a09]). Random tokens will result in an 
unbalanced ring; see http://wiki.apache.org/cassandra/Operations
[junit] -  ---
[junit] Flushing results...
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[junit] Cobertura: Loaded information on 1002 classes.
[junit] Cobertura: Saved information on 1002 classes.
[junit] Testsuite: org.apache.cassandra.service.InitClientTest
[junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 5.479 sec
[junit] 
[junit] - Standard Error -
[junit] ERROR 17:28:26,173 Received untranslated stream from newer protcol 
version. Terminating connection!
[junit] -  ---
[junit] Flushing results...
[junit] Flushing results done
[junit] Cobertura: Loaded information on 1002 classes.
[junit] Cobertura: Saved information on 1002 classes.
[junit] Testsuite: org.apache.cassandra.service.MoveTest
[junit] Tests run: 6, Failures: 0, Errors: 0, Time elapsed: 1.294 sec
[junit] 
[junit] - Standard Error -
[junit]  WARN 17:28:33,074 Node /127.0.0.3 'leaving' token mismatch. Long 
network partition?
[junit] -  ---
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[junit] Flushing results done
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[junit] Testsuite: org.apache.cassandra.service.RemoveTest
[junit] Tests run: 5, Failures: 0, Errors: 0, Time elapsed: 1.988 sec
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[junit] Testsuite: org.apache.cassandra.service.RowResolverTest
[junit] Tests run: 5, Failures: 0, Errors: 0, Time elapsed: 0.491 sec
[junit] 
[junit] Flushing results...
[junit] Flushing results done
[junit] Cobertura: Loaded information on 1002 classes.
[junit] Cobertura: Saved information on 1002 classes.
[junit] Testsuite: org.apache.cassandra.service.SerializationsTest
[junit] Tests run: 2, Failures: 0, Errors: 0, Time elapsed: 0.486 sec
[junit] 
[junit] Flushing results...
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[junit] Testsuite: org.apache.cassandra.service.StorageProxyTest
[junit] Tests run: 4, Failures: 0, Errors: 0, Time elapsed: 0.529 sec
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[junit] Testsuite: org.apache.cassandra.service.StorageServiceClientTest
[junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 5.494 sec
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[junit] Flushing results done
[junit] Cobertura: Loaded information on 1002 classes.
[junit] Cobertura: Saved information on 1002 classes.
[junit] Testsuite: org.apache.cassandra.service.StorageServic

Build failed in Jenkins: Cassandra-Coverage #19

[Apache Hudson Server]

See 

Changes:

[jbellis] isFrozen needs to be volatile

[jbellis] revert #1954 for now

[jbellis] r/m unused code

[jbellis] really revert SSTableExport move

[jbellis] move stress package from o.a.c.contrib to o.a.c

[jbellis] move example code from contrib/ to examples/, and tools from contrib/ 
to tools/

[jbellis] Revert incomplete move of sstable [ex/im]port code

[jbellis] upgrade to whirr 0.4
patch by Pavel Yaskevich for CASSANDRA-2265

[jbellis] modernize column name quoting

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[junit] Testcase: 
testStartRemoving(org.apache.cassandra.service.RemoveTest):   Caused an 
ERROR
[junit] null
[junit] java.lang.NullPointerException
[junit] at 
org.apache.cassandra.net.MessagingService.shutdown(MessagingService.java:407)
[junit] at 
org.apache.cassandra.service.RemoveTest.tearDown(RemoveTest.java:90)
[junit] 
[junit] 
[junit] Testcase: 
testFinishRemoving(org.apache.cassandra.service.RemoveTest):  Caused an 
ERROR
[junit] /127.0.0.1:7010 is in use by another process.  Change 
listen_address:storage_port in cassandra.yaml to values that do not conflict 
with other services
[junit] org.apache.cassandra.config.ConfigurationException: /127.0.0.1:7010 
is in use by another process.  Change listen_address:storage_port in 
cassandra.yaml to values that do not conflict with other services
[junit] at 
org.apache.cassandra.net.MessagingService.getServerSocket(MessagingService.java:195)
[junit] at 
org.apache.cassandra.net.MessagingService.listen(MessagingService.java:168)
[junit] at 
org.apache.cassandra.service.RemoveTest.setup(RemoveTest.java:74)
[junit] 
[junit] 
[junit] Testcase: 
testFinishRemoving(org.apache.cassandra.service.RemoveTest):  Caused an 
ERROR
[junit] null
[junit] java.lang.NullPointerException
[junit] at 
org.apache.cassandra.net.MessagingService.shutdown(MessagingService.java:407)
[junit] at 
org.apache.cassandra.service.RemoveTest.tearDown(RemoveTest.java:90)
[junit] 
[junit] 
[junit] Flushing results...
[junit] Flushing results done
[junit] Cobertura: Loaded information on 812 classes.
[junit] Cobertura: Saved information on 812 classes.
[junit] Test org.apache.cassandra.service.RemoveTest FAILED
[junit] Testsuite: org.apache.cassandra.service.RowResolverTest
[junit] Tests run: 5, Failures: 0, Errors: 0, Time elapsed: 0.453 sec
[junit] 
[junit] Flushing results...
[junit] Flushing results done
[junit] Cobertura: Loaded information on 812 classes.
[junit] Cobertura: Saved information on 812 classes.
[junit] Testsuite: org.apache.cassandra.service.SerializationsTest
[junit] Tests run: 2, Failures: 0, Errors: 0, Time elapsed: 0.45 sec
[junit] 
[junit] Flushing results...
[junit] Flushing results done
[junit] Cobertura: Loaded information on 812 classes.
[junit] Cobertura: Saved information on 812 classes.
[junit] Testsuite: org.apache.cassandra.service.StorageProxyTest
[junit] Tests run: 4, Failures: 0, Errors: 0, Time elapsed: 0.496 sec
[junit] 
[junit] Flushing results...
[junit] Flushing results done
[junit] Cobertura: Loaded information on 812 classes.
[junit] Cobertura: Saved information on 812 classes.
[junit] Testsuite: org.apache.cassandra.service.StorageServiceClientTest
[junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 5.477 sec
[junit] 
[junit] Flushing results...
[junit] Flushing results done
[junit] Cobertura: Loaded information on 812 classes.
[junit] Cobertura: Saved information on 812 classes.
[junit] Testsuite: org.apache.cassandra.service.StorageServiceServerTest
[junit] Tests run: 3, Failures: 0, Errors: 0, Time elapsed: 0.821 sec
[junit] 
[junit] - Standard Error -
[junit]  WARN 17:29:11,337 Generated random token 
Token(bytes[fb88b7e7024fb63fbb43492cb3935727]). Random tokens will result in an 
unbalanced ring; see http://wiki.apache.org/cassandra/Operations
[junit] -  ---
[junit] Flushing results...
[junit] Flushing results done
[junit] Cobertura: Loaded information on 812 classes.
[junit] Cobertura: Saved information on 812 classes.
[junit] Testsuite: org.apache.cassandra.streaming.BootstrapTest
[junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 0.672 sec
[junit] 
[junit] Flushing results...
[junit] Flushing results done
[junit] Cobertura: Loaded information on 812 classes.
[junit] Cobertura: Saved information on 812 classes.
[junit] Testsuite: org.apache.cassandra.streaming.SerializationsTest
[junit] Tests run: 4, Failures: 0, Errors: 0, Time elapsed: 0.521 sec
[junit] 
[junit] Flushing results...
[junit] Flush