[jira] [Created] (CASSANDRA-13794) Fix short read protection logic for querying more rows

["Aleksey Yeschenko (JIRA)" <ji...@apache.org>]

Aleksey Yeschenko created CASSANDRA-13794:
---------------------------------------------

             Summary: Fix short read protection logic for querying more rows
                 Key: CASSANDRA-13794
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13794
             Project: Cassandra
          Issue Type: Bug
          Components: Coordination
            Reporter: Benedict
            Assignee: Aleksey Yeschenko
             Fix For: 3.0.x, 3.11.x


Discovered by [~benedict] while reviewing CASSANDRA-13747:

{quote}
While reviewing I got a little suspicious of the modified line {{DataResolver}} :479, as it seemed that n and x were the wrong way around... and, reading the comment of intent directly above, and reproducing the calculation, they are indeed.

This is probably a significant enough bug that it warrants its own ticket for record keeping, though I'm fairly agnostic on that decision.

I'm a little concerned about our current short read behaviour, as right now it seems we should be requesting exactly one row, for any size of under-read, which could mean extremely poor performance in case of large under-reads.

I would suggest that the outer unconditional {{Math.max}} is a bad idea, has been (poorly) insulating us from this error, and that we should first be asserting that the calculation yields a value >= 0 before setting to 1.
{quote}



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)

---------------------------------------------------------------------
To unsubscribe, e-mail: commits-unsubscribe@cassandra.apache.org
For additional commands, e-mail: commits-help@cassandra.apache.org