Hello everybody! If you look at the stackTrace, the error is that deserialized objects are being sent to listeners. It may be more correct to send a raw arrays of bytes, and each plugin will be able to process it if needed.
18.12.2020, 12:18, "Nikolay Izhikov" <nizhi...@apache.org>: > Hello, Denis. > > It’s a known issue for me. > Metastore is a private API, isn’t it? > AFAICU it can occur for two reasons: > > * User migrates from custom Ignite fork that has private improvements or > plugins that write to the metastore. > * We have a blocker bug and just remove some internal class that can be > written into metastore from distribution. > > I planned to fix it with some system flag. > During startup administrator just sets a list of the metastore items that > should be ignored. > Please, take a look at the PR [1] > > WDYT? > >> it’s better to limit the metastorage with storing primitives only > > I think that ability to write object is very useful and should stay. > > [1] https://github.com/apache/ignite/pull/8221 > >> 18 дек. 2020 г., в 12:06, Mekhanikov Denis <dmekhani...@gmail.com> >> написал(а): >> >> Hi everyone! >> >> Ignite has a limitation that it can’t work with custom classes put into >> metastorage: https://issues.apache.org/jira/browse/IGNITE-13642 >> If you put a POJO into the metastorage, then Ignite will try to deserialize >> it using the classes it finds on the classpath. If it can’t do the >> deserialization, then the node will fail. >> >> There is an opinion that the metastorage wasn’t design for a case when >> classes that can disappear from Ignite distribution. >> If we follow this path, then it’s better to limit the metastorage with >> storing primitives only, so that it’s impossible to occasionally put >> anything breaking. >> If a piece of configuration is put into the metastorage by a plugin, then >> the plugin will be in charge of deserializing the configuration, and not >> Ignite. >> >> Alternatively we can try to fix the metastorage and make it ignore >> deserialization errors when they occur. >> >> What do you think? >> >> Denis
