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https://issues.apache.org/jira/browse/IGNITE-20375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17763124#comment-17763124
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Igor Sapego commented on IGNITE-20375:
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Done.
> Thin 3.0: Review packArrayHeader usage
> --------------------------------------
>
> Key: IGNITE-20375
> URL: https://issues.apache.org/jira/browse/IGNITE-20375
> Project: Ignite
> Issue Type: Improvement
> Components: thin client
> Affects Versions: 3.0.0-beta1
> Reporter: Pavel Tupitsyn
> Assignee: Pavel Tupitsyn
> Priority: Major
> Labels: ignite-3
> Fix For: 3.0.0-beta2
>
>
> Ignite 3.x client protocol uses MsgPack for message serialization. In some
> places we use *packArrayHeader* incorrectly, for example,
> [ClientCompute.packJob|https://github.com/apache/ignite-3/blob/fa8d626f57e3497289c0aaa1bfa8efd19f1042f7/modules/client/src/main/java/org/apache/ignite/internal/client/compute/ClientCompute.java#L330]:
> {code:java}
> w.packArrayHeader(units.size());
> for (DeploymentUnit unit : units) {
> w.packString(unit.name());
> w.packString(unit.version().render());
> }
> {code}
> We pack 2N items for an array of size N, and in some cases those items can be
> of different type, which breaks the rules of MsgPack protocol.
> This creates issues with some MsgPack implemetations, such as the one used in
> C++ client (msgpack-c):
> * Exactly N items must be present
> * Entire array is deserialized at once (can't read large arrays one by one)
> Proposal: don't use *packArrayHeader* at all, replace with *packInt*, which
> allows more flexibility.
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