[IMPALA-2366] DiskIoMgr error handling with fread()

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: Impala 1.3, Impala 1.4, Impala 2.0, Impala 2.1, Impala 2.2, Impala 2.3.0
• Fix Version/s: Impala 2.3.0, Impala 2.2.8
• Target Version: Impala 2.3.0, Impala 2.2.8
• Assignee: Tim Armstrong
• Reporter: Tim Armstrong
• Created: 18/Sep/15 16:14
• Updated: 10/Nov/15 20:12
• Resolved: 20/Sep/15 05:57

Description

The fread() API specifies that it can return some number of items read less than then number of items specified. DiskIoMgr treats this case as a success and assumes all the requested data was read, whereas in reality it's possible for fread to hit an error and return a positive number.