Hi Moiz,
This happens due to several reasons:
- you're using peer-class-loading feature [1] that allows to load a
class definition from remote nodes if a class is missed locally.
- in your case a remote node loads Model class from the node that
created TEST cache and has its class locally;
- when the node that started the cache leaves the cluster this cache is
undeployed because DeploymentMode.SHARED mode is used. Please refer to
the description of this and other nodes for more details.
To workaround this situation you can switch to Ignite 1.5.0.final that
uses binary objects format [2] for which peer-class-loading is not
needed at the cache level and thus the undeployment will not happen.
If you don't need the peer-class-loading for the rest of functionality
(Ignite Compute, scan queries filters, etc.) then I would suggest you
turning off it at all by removing
<property name="peerClassLoadingEnabled" value="true"/>
from your config.
[1] https://apacheignite.readme.io/docs/zero-deployment
[2] https://apacheignite.readme.io/docs/binary-marshaller
--
Denis
On 2/9/2016 9:17 AM, Syed Moizuddin wrote:
Hi,
I have a ignite cluster with cache TEST created as follows:
try (Ignite ignite = Ignition.start("config/example-ignite.xml"));) {
System.out.println(">>> Cache data streamer example started.");
CacheConfiguration<Long, Model> cacheConfiguration =new
CacheConfiguration<>(CACHE_NAME);
cacheConfiguration.setCacheMode(CacheMode.PARTITIONED);// Default.
cacheConfiguration.setIndexedTypes(Long.class, Model.class);
cacheConfiguration.setBackups(1);
...
When one of the node crashes, the cache is cleared and I see the
following log on the running nodes.
[13:12:02] Topology snapshot [ver=48, servers=12, clients=2, CPUs=136,
heap=54.0GB]
[13:23:43] Topology snapshot [ver=49, servers=11, clients=2, CPUs=136,
heap=50.0GB]
[13:25:58] Cleared all cache entries for undeployed class loader
[cacheName=TEST, undeployCnt=1079679, swapUndeployCnt=0,
clsLdr=o.a.i.i.managers.deployment.GridDeploymentClassLoader]
[13:25:58] ^-- Cache auto-undeployment happens in SHARED deployment
mode (to turn off, switch to CONTINUOUS mode)
Could someone help me explain(or point to doc) what happened how to
avoid the cache getting cleared.
Regards,
Moiz
