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Bug#40264: Aborted cached query causes query to hang indefinitely on next cache hit

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The problem is that the query cache was storing partial results
if the statement failed when sending the results to the client.
This could cause clients to hang when trying to read the results
from the cache as they would, for example, wait indefinitely for
a eof packet that wasn't saved.

The solution is to always discard the caching of a query that
failed to send its results to the associated client.

mysql-test/r/query_cache_notembedded.result:
  Add test case result for Bug#40264
mysql-test/t/query_cache_notembedded.test:
  Add test case for Bug#40264
sql/sql_cache.cc:
  Abort if a unreported error was raised.
This commit is contained in:
Davi Arnaut 2009-01-22 08:28:01 -02:00
commit ecfdc3560c
3 changed files with 53 additions and 1 deletions
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7
sql/sql_cache.cc
View file

@ -710,7 +710,12 @@ void query_cache_end_of_result(THD *thd)
if (thd->net.query_cache_query == 0)
DBUG_VOID_RETURN;
if (thd->killed)
/*
Check if the NET layer raised a unreported error -- my_error() and
as a consequence query_cache_abort() haven't been called. Abort the
cached result as it might be only partially complete.
*/
if (thd->killed || thd->net.report_error)
{
query_cache_abort(&thd->net);
DBUG_VOID_RETURN;