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18a44b4298A spider_conn may outlive its associated ha_spider (in the field queued_ping_spider) used for connecting to and pinging the data node (a call to spider_db_ping(), guarded by the boolean field queued_ping). In a call to ha_spider::close() (which is often preceded with the deletion of the ha_spider itself), many cleanups happen, including freeing the associated spider_share, which is used by the spider_conn in spider_db_ping. Therefore it is necessary to reset both the queued_ping_spider and queued_ping fields, so that any further spider interaction with the data node will not trigger the call using the ha_spider including its freed spider_share. Also out of caution added an assert and internal error in case a connection has not been established (the db_conn field of type MYSQL * is NULL), and attempt to connect is skipped because both queued_connect and queued_ping are false. Note that this unlikely (if not impossible) scenario would not be a regression caused by this change, as it strictly falls under the scenario of this bug. |
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| .. | ||
| archive | ||
| blackhole | ||
| cassandra | ||
| columnstore | ||
| connect | ||
| csv | ||
| example | ||
| federated | ||
| federatedx | ||
| heap | ||
| innobase | ||
| maria | ||
| mroonga | ||
| myisam | ||
| myisammrg | ||
| oqgraph | ||
| perfschema | ||
| rocksdb | ||
| sequence | ||
| sphinx | ||
| spider | ||
| test_sql_discovery | ||
| tokudb | ||