Re: [quicwg/base-drafts] Clarify QPACK eviction races (#1237)

[afrind <[e-mail]>]

afrind commented on this pull request.



> +any eviction-prone entries, which are dynamic table entries that might be
+evicted soon.  Rather than reference an eviction-prone entry, the encoder SHOULD
+emit an Indexed-Duplicate representation (see {{indexed-duplicate}}), and
+reference the duplicate instead.
+
+To identify eviction-prone entries, the encoder can maintain a draining index,
+which is the smallest absolute index in the dynamic table that it will emit a
+reference for.  As new entries are inserted, the encoder increments the
+draining index such that the amount of free and draining space in the dyanmic
+table is larger than its target threshold.
+
+~~~~~~~~~~  drawing
+   +----------------+-----------------------+------------+
+   | Eviction-prone |     Referenceable     | Free Space |
+   |    Entries     |        Entries        |            |
+   +----------------+-----------------------+------------+

There's usually some free space because it's not possible to evict a partial header.   Maybe I could make it look smaller?  The text talks about the sum of free space and draining space so I wanted to include it in the picture.

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