Comments on: Running Cassandra as an embedded service

By: mck

mck — Fri, 12 Nov 2010 12:57:35 +0000

0.7.0 has some differences i’ve found.

Instead of
System.setProperty(“storage-config”, “../../test/conf”);
you’ll need (because of the change to yaml)
System.setProperty(“cassandra.config”, “../../test/conf/cassandra.yaml”);

Also if the property value is an absolute filepath it needs to be in URL format, see DatabaseDescriptor.getStorageConfigURL()

By: Ran Tavory

Ran Tavory — Fri, 10 Sep 2010 11:54:52 +0000

@Kannan if memtables aren’t flushed then cassandra will read the commit log when it starts up next time so data isn’t lost.
Per your code, I’m now too far away from the latest on trunk so it’s best to advice with dev@cassandra

By: Kannan

Kannan — Fri, 10 Sep 2010 03:39:49 +0000

Thanks for the reply. I notice that if I kill the jvm and the memtable is not full yet, its not flushing the in-memory data to disk. Any ideas how to get around this ? Currently I am using something like this:

for(String t: DatabaseDescriptor.getTables()) {
Table table = Table.open(t);
for(ColumnFamilyStore cfs: table.getColumnFamilyStores()) {
cfs.forceBlockingFlush();
}
}

Do you see any problems with this? Is there a better way to do it ?

Thanks again

By: Ran Tavory

Ran Tavory — Thu, 09 Sep 2010 11:51:58 +0000

you mean why it cannot be killed? it’s been discussed at user@cassandra a few times. Basically it’s a design decision and was never considered important enough to rethink it

By: Kannan

Kannan — Wed, 08 Sep 2010 23:52:33 +0000

Thanks for putting up this embedded server, very helpful
Any ideas why this is a cassandra design limitation ?

By: Ran Tavory

Ran Tavory — Mon, 02 Aug 2010 18:57:51 +0000

no, that’s a design limitation in cassandra

By: Michael Zehrer

Michael Zehrer — Mon, 02 Aug 2010 15:48:15 +0000

Is there a solution for the shutdown problem? One that does not require me to kill the JVM?

By: Confluence: Team Message Archiver

Confluence: Team Message Archiver — Fri, 30 Jul 2010 17:38:40 +0000

Cassandra Research Links…

Cassandra Research Google indexing/searching…

By: Understanding Cassandra Code Base | PrettyPrint.me

Understanding Cassandra Code Base | PrettyPrint.me — Sun, 02 May 2010 14:20:14 +0000

[...] have a closer look at the internal design of the system. While with some features added, such as an embedded service, I could have certainly get away without good understanding of the codebase and design, others, [...]

By: links for 2010-04-26 « Daniel Harrison's Personal Blog

links for 2010-04-26 « Daniel Harrison's Personal Blog — Tue, 27 Apr 2010 02:02:22 +0000

[...] Running Cassandra as an embedded service | PrettyPrint.me (tags: cassandra java) [...]