Hi Scott, As far as I know, peer class loading does not work for data classes (which are stored in a cache). It works for tasks sended for execution using IgniteCompute.
It is only a partial answer. Could you describe your use case in more details? вт, 28 мая 2019 г. в 23:35, Scott Cote <sc...@etcc.com>: > > Whoops – sent to the wrong list … > > > > From: Scott Cote > Sent: Tuesday, May 28, 2019 1:04 PM > To: d...@ignite.apache.org > Subject: class loading, peer class loading, jars, fun times in ignite > > > > I am fairly certain that I don’t know how to use peer class loading properly. > > > > Am using Apache Ignite 2.7. If I have a node running on 192.168.1.2 with a > peer class loading enabled, and I start up a second node – 192.168.1.3, > client mode enabled and peer class loading enabled, then I expected the > following: > > > > Running the snippet (based on > https://apacheignite.readme.io/docs/getting-started#section-first-ignite-data-grid-application > ) on the client (192.168.1.3): > > > > try (Ignite ignite = Ignition.start("examples/config/example-ignite.xml")) { > > IgniteCache<Integer, MyWrapperOfString> cache = > ignite.getOrCreateCache("myCacheName"); > > > > // Store keys in cache (values will end up on different cache nodes). > > for (int i = 0; i < 10; i++) > > cache.put(i,new MyWrapperOfString( Integer.toString(i))); > > > > for (int i = 0; i < 10; i++) > > System.out.println("Got [key=" + i + ", val=" + cache.get(i) + ']'); > > } > > > > > > Would cause the cache of “MyWrapperOfString” instances to be available on > 192.168.1.2 and on 192.168.1.3 . Also be able to observe the cache using > visor, etc …. > > > > However – I instead get an error that the class “MyWrapperOfString” is not > available on 192.168.1.2. Now if I take the jar that the class is packed, > and place it in the lib folder, all is happy. > > > > Should I have to do this? > > If yes – how do I update the jar if I have a cluster of nodes doing this? > Do I have to shutdown the entire cluster in order to not have class loader > problems? > > I thought the peer class loading is supposed to solve this problem. > > > > I think it would be VERY INSTRUCTIVE for the snippet that I anchored to not > use a standard java library cache object, but to demonstrate the need to > package value object into a jar and stuff it into the lib folder (If this is > what is expected). Running lambdas that use basic java primitives is > cool, but is this the normal? > > > > Switching up …. Is there interest in me creating class loader that would load > java classes into the vm that could be incorporated into ignite? So instead > of reading a jar, you load the class bytes into a cache . You want to hot > load a new class? Fine ! pump into the DISTRIBUTED_CLASS_PATH_CACHE . > > > > Cheers. > > > > SCott > > -- Best regards, Ivan Pavlukhin
