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From Ognen Duzlevski <ognen.duzlev...@gmail.com>
Subject A few questions
Date Thu, 16 Apr 2015 14:01:01 GMT
Hello all,

I have a few questions as I am starting to play with Ignite in Scala:

1. It seems like every time I want to obtain a reference to a cache, I
actually "join or create a grid" with a full fledged JVM/CPU-set/dedicated
heap - is this observation correct? Is there a way to just use Ignite as a
"library" - I make a call, get a reference to a cache and execute puts and
gets. Or am I completely missing the point?

2. I am trying to create an Akka actor system where an actor commits some
data to a cache upon receiving a message. I already have a grid running and
it seems like I am able to join that local grid to use the named cache
(appropriately named "testCache"). Below is the output of what is happening
- am not sure what exactly the error message means - is it some kind of a
serialization issue? I am running my example from sbt - do I need to create
a fat jar and run/deploy that in order to make the failing class available?

[08:12:06] Topology snapshot [ver=15, nodes=1, CPUs=8, heap=1.0GB]
[08:39:07] Topology snapshot [ver=16, nodes=2, CPUs=8, heap=2.3GB]
[08:39:08,582][SEVERE][ignite-#23%sys-null%][GridCacheIoManager] Failed to
process message (note that distributed services do not support peer class
loading, if you deploy distributed service you should have all required
classes in CLASSPATH on all nodes in topology)
[senderId=5e9a1002-76de-495a-8244-8ca337907f72, err=Failed to load class
[name=com.shoutlet.datascience.socialnetworkpollers.CacheGenderData,
ctx={1785472cc41-5e9a1002-76de-495a-8244-8ca337907f72=CachedDeploymentInfo
[sndId=5e9a1002-76de-495a-8244-8ca337907f72,
ldrId=1785472cc41-5e9a1002-76de-495a-8244-8ca337907f72, userVer=0,
depMode=SHARED, participants=null]}]]
[08:39:30] Topology snapshot [ver=17, nodes=1, CPUs=8, heap=1.0GB]
[08:39:30]
[08:39:30] Cleared all cache entries for undeployed class loader for cache:
default
[08:39:30]   ^-- Cache auto-undeployment happens in SHARED deployment mode
(to turn off, switch to CONTINUOUS mode)
[08:39:30]
[08:39:30]
[08:39:30] Cleared all cache entries for undeployed class loader for cache:
testCache
[08:39:30]   ^-- Cache auto-undeployment happens in SHARED deployment mode
(to turn off, switch to CONTINUOUS mode)
[08:39:30]
[08:47:50] Topology snapshot [ver=18, nodes=2, CPUs=8, heap=2.3GB]
[08:47:53,788][SEVERE][ignite-#32%sys-null%][GridCacheIoManager] Failed to
process message (note that distributed services do not support peer class
loading, if you deploy distributed service you should have all required
classes in CLASSPATH on all nodes in topology)
[senderId=78ec49fd-bb7b-44b8-a618-0b2b0ed6584c, err=Failed to load class
[name=com.shoutlet.datascience.socialnetworkpollers.CacheGenderData,
ctx={7235c72cc41-78ec49fd-bb7b-44b8-a618-0b2b0ed6584c=CachedDeploymentInfo
[sndId=78ec49fd-bb7b-44b8-a618-0b2b0ed6584c,
ldrId=7235c72cc41-78ec49fd-bb7b-44b8-a618-0b2b0ed6584c, userVer=0,
depMode=SHARED, participants=null]}]]
[08:48:48] Topology snapshot [ver=19, nodes=1, CPUs=8, heap=1.0GB]

3. Is there a user list where people can ask questions like the above? This
is dev list and this email may not necessarily fall under that
classification. I know there is "Ask a question" on the web site but it is
rather inconvenient and does not compare to a mailing list :)

Thanks!

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