[GitHub] [geode] wabp2005 commented on a diff in pull request #7861: GEODE-10423: Document the system property “ON_DISCONNECT_CLEAR_PDXTYP…

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wabp2005 commented on code in PR #7861:
URL: https://github.com/apache/geode/pull/7861#discussion_r976126190


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geode-docs/developing/data_serialization/PDX_Serialization_Features.html.md.erb:
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@@ -31,6 +31,25 @@ When you serialize an object using PDX, <%=vars.product_name%> stores the object
 
 This centralization of object type information is advantageous for client/server installations in which clients and servers are written in different languages. Clients pass registry information to servers automatically when they store a PDX serialized object. Clients can run queries and functions against the data in the servers without compatibility between server and the stored objects. One client can store data on the server to be retrieved by another client, with no requirements on the part of the server.
 
+**Note:**
+When pdx registry is not persistent or persistent pdx registry is removed, if all the servers are stopped/crashed with clients still running, then the client with previous pdx type info connects to cluster with servers that are re-started, the client will see Unknown pdx type error.

Review Comment:
   Yes, PDX types are stored into an internal region in the cluster, this region is replicated, if any server still online, the pdx types info will not lost.



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