[ARROW-13152] Plasma server hangs on Get requests containing duplicate object IDs

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 4.0.1
• Component/s: C++, C++ - Plasma
• Environment: tested on Linux/Python 3.8/pyarrow 4.0.1
• External issue URL: https://github.com/apache/arrow/issues/28852
• Assignee: Unassigned
• Reporter: Bruce Martin
• Created: 23/Jun/21 18:26
• Updated: 11/Jan/23 08:31

Description

If a plasma client issues a Get request containing duplicate object IDs, and a timeout of -1, the server will hang.

The logic at the end of `PlasmaStore::ProcessGetRequest()` only returns a response when the number of satisfied requests match the number of unique objects to wait for.  The former is calculated using the number of requested object IDs, not the number of unique requested object IDs.

To reproduce:

 

# start the plasma store first

from pyarrow import plasma
client = plasma.connect("/tmp/plasma")
oid = client.put("hello, world")
print(client.get([oid, oid], -1))print("done.")