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From "Valentin Kulichenko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-1903) CacheStore implementation is serialised to grid clients whether they require it or not
Date Tue, 21 Feb 2017 22:37:44 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-1903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15876891#comment-15876891
] 

Valentin Kulichenko commented on IGNITE-1903:
---------------------------------------------

This is actually more generic issue. When a new node joins (client or server), all existing
cache configurations (which include cache stores) are sent to this node. It then deserializes
it during startup which can cause exceptions on clients or servers where cache is not supposed
to be deployed as defined by node filter.

As a solution we can do the following:
* During discovery, send node filter and cache store factory in binary format along with the
cache configuration, not as its parts.
* On server, check node filter first and deserialize cache configuration and cache store only
if it returns true. In case of error, STOP join process (now we just print exception in log
and go on, which is very error-prone).
* On client, do not deserialize cache configuration and cache store until user's code tries
to actually use the cache (calls {{Ignite.cache}}. If cache is ATOMIC, never deserialize the
cache store.

> CacheStore implementation is serialised to grid clients whether they require it or not
> --------------------------------------------------------------------------------------
>
>                 Key: IGNITE-1903
>                 URL: https://issues.apache.org/jira/browse/IGNITE-1903
>             Project: Ignite
>          Issue Type: Bug
>    Affects Versions: 1.5.0.final
>            Reporter: Michael Griggs
>              Labels: community
>             Fix For: 2.0
>
>
> See User discussion thread:  http://apache-ignite-users.70518.x6.nabble.com/CacheStore-being-serialized-to-client-td1931.html
> Brief summary:  When a grid client joins the grid (clientMode=true) it receives a message
from the server node(s) on the grid that contains the serialized CacheStore implementation
object.  If the client does not have this class on its CLASSPATH (and there is no reason it
should, as it is a client) then the de-serialization of this message will fail, causing this
exception:
> {code}SEVERE: Failed to unmarshal discovery data for component: 1 
> class org.apache.ignite.IgniteCheckedException: Failed to find class with given class
loader for unmarshalling (make sure same versions of all classes are available on all nodes
or enable peer-class-loading): sun.misc.Launcher$AppClassLoader@14dad5dc 
>         at org.apache.ignite.marshaller.jdk.JdkMarshaller.unmarshal(JdkMarshaller.java:104)

>         at org.apache.ignite.marshaller.AbstractMarshaller.unmarshal(AbstractMarshaller.java:67)

>         at org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi.onExchange(TcpDiscoverySpi.java:1529)

>         at org.apache.ignite.spi.discovery.tcp.ClientImpl$MessageWorker.processNodeAddFinishedMessage(ClientImpl.java:1317)

>         at org.apache.ignite.spi.discovery.tcp.ClientImpl$MessageWorker.processDiscoveryMessage(ClientImpl.java:1229)

>         at org.apache.ignite.spi.discovery.tcp.ClientImpl$MessageWorker.body(ClientImpl.java:1199)

>         at org.apache.ignite.spi.IgniteSpiThread.run(IgniteSpiThread.java:62) 
> Caused by: java.lang.ClassNotFoundException: c.g.r.cachewrapper.ignite.CacheMissHandlerIgnite
> {code}
> where {{c.g.r.cachewrapper.ignite.CacheMissHandlerIgnite}} is the CacheStore implementation.
> The ostensible reason for the CacheStore serialization is so that clients of a TRANSACTIONAL
cache can begin the transaction on the underlying store.  
> The only current solution to this is to add the grid node's CacheStore implementation
class definition to the CLASSPATH of the client.  This creates an *undesirable coupling* between
server and client.



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