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https://issues.apache.org/jira/browse/THRIFT-4024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15815139#comment-15815139
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Jens Geyer commented on THRIFT-4024:
------------------------------------
Under which circumstances can we run into a unknown type? The Thrift type
system is well-defined, there should not be an unknown type at all. Can we have
a test case?
> C# deserialization takes unnecessary time on list with unknown type of
> elements
> -------------------------------------------------------------------------------
>
> Key: THRIFT-4024
> URL: https://issues.apache.org/jira/browse/THRIFT-4024
> Project: Thrift
> Issue Type: Bug
> Components: C# - Library
> Affects Versions: 0.10.0
> Reporter: Michael Antipin
>
> I'm using TBinaryProtocol and a simple transport that reads from a given byte
> array.
> C# library contains the following code in TProtocolUtil.Skip(TProtocol prot,
> TType type):
> {code}
> case TType.List:
> TList list = prot.ReadListBegin();
> for (int i = 0; i < list.Count; i++) {
> Skip(prot, list.ElementType);
> }
> prot.ReadListEnd();
> break;
> {code}
> The type of elements is detected in ReadListBegin(), and, as Skip() does
> nothing for unknown types, the position in the binary remains the same until
> the for loop completes.
> So, when you try to deserialize invalid data, and a field type happens to be
> detected as TType.List, you may end up waiting for a random period of time
> until deserialization is completed (734707176 iterations of skipping in my
> case).
> I suggest throwing an exception immediately when list elements type is
> unknown. May be, it would be good to have a setting like *FailOnUnknownType*,
> so that Skip() will throw instead of ignoring.
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