Ye Zihao created IMPALA-11998:
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Summary: The iterator provided by ImpalaServer::GetQueryRecord()
may become invalid
Key: IMPALA-11998
URL: https://issues.apache.org/jira/browse/IMPALA-11998
Project: IMPALA
Issue Type: Bug
Components: be
Affects Versions: Impala 4.2.0
Reporter: Ye Zihao
Assignee: Ye Zihao
{code:c++}
Status ImpalaServer::GetQueryRecord(const TUniqueId& query_id,
QueryLogIndex::const_iterator* query_record) {
lock_guard<mutex> l(query_log_lock_);
*query_record = query_log_index_.find(query_id);
...
return Status::OK();
}
{code}
This may cause the caller to access invalid iterators, although the function
locks query_log_lock_ in the execution, the query_record it provides cannot
guarantee to be valid, because it is out of the protection of query_log_lock_
after returning, if query_log_index_ just deletes the corresponding record at
this time, then query_record will be an invalid iterator.
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