bneradt commented on code in PR #13410:
URL: https://github.com/apache/trafficserver/pull/13410#discussion_r3708496221
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src/iocore/cache/CacheVC.cc:
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@@ -210,6 +210,14 @@ CacheVC::do_io_write(Continuation *c, int64_t nbytes,
IOBufferReader *abuf, bool
vio.ndone = 0;
vio.nbytes = nbytes;
vio.vc_server = this;
+ if (nbytes == 0) {
+ // A zero-byte write represents an empty document, while closing without a
+ // write represents a header-only update.
+ f.allow_empty_doc = 1;
+ if (alternate.valid()) {
Review Comment:
Good point. I moved the debug mutex assertion above the zero-byte handling
so the locking invariant is checked before accessing alternate or
f.allow_empty_doc.
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