[jira] [Resolved] (GEODE-9427) Radish HSCAN implementation does not accept values for CURSOR argument that match Redis

["Donal Evans (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GEODE-9427?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Donal Evans resolved GEODE-9427.
--------------------------------
    Fix Version/s: 1.15.0
       Resolution: Fixed

The Redis documentation states that *SCAN behaviour is undefined for CURSOR values other than 0 or the value returned by the previous *SCAN command. Given that it is not possible for a *SCAN command to return a value greater than Integer.MAX_VALUE, any value greater than that is not a valid CURSOR and so the behaviour of the command is undefined.

For this reason, it was decided that returning an error for CURSOR values greater than Long.MAX_VALUE was an acceptable compromise that prevented the need to create BigInteger objects that are only used for corner-case input validation while still allowing behaviour that's the same as native Redis for all valid inputs.

> Radish HSCAN implementation does not accept values for CURSOR argument that match Redis
> ---------------------------------------------------------------------------------------
>
>                 Key: GEODE-9427
>                 URL: https://issues.apache.org/jira/browse/GEODE-9427
>             Project: Geode
>          Issue Type: Bug
>          Components: redis
>    Affects Versions: 1.15.0
>            Reporter: Donal Evans
>            Assignee: Donal Evans
>            Priority: Major
>             Fix For: 1.15.0
>
>
> The HSCAN command takes an argument, CURSOR, which in native Redis can be any value between -18446744073709551615 and 18446744073709551615 (the maximum value of an unsigned long). The Radish implementation of HSCAN only accepts values in the range {{Integer.MIN_VALUE}} -> {{Integer.MAX_VALUE}} and returns an error if values outside this range are used.
> The Radish HSCAN implementation should be modified to accept the same range of values as Redis. Examples of this can be found in the implementations of the currently unsupported SCAN and SSCAN commands.



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