[infinispan-issues] [JBoss JIRA] Assigned: (ISPN-809) CassandraCacheStore needs special handling of array type keys

[Tristan Tarrant (JIRA)]

     [ https://jira.jboss.org/browse/ISPN-809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tristan Tarrant reassigned ISPN-809:
------------------------------------

    Assignee: Tristan Tarrant  (was: Manik Surtani)


> CassandraCacheStore needs special handling of array type keys
> -------------------------------------------------------------
>
>                 Key: ISPN-809
>                 URL: https://jira.jboss.org/browse/ISPN-809
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Loaders and Stores
>    Affects Versions: 4.2.0.CR2
>            Reporter: Jonas Lasson
>            Assignee: Tristan Tarrant
>            Priority: Critical
>             Fix For: 4.2.0.CR3
>
>
> Currently the Cassandra store is creating CassandraKeys based on the keys .toString method, see below:
> 	private String hashKey(Object key) {
> 		return entryKeyPrefix + key.toString();
> 	}
> When HotRod server is used the key will be a ByteArrayKey, which has a toString that is non deterministic and outputs (3 examples with the same byte array):
> ByteArrayKey{data=ByteArray{size=8, hashCode=33d626a4, array=[2, 62, 5, 74, 79, 78, 65, 83, ..]}}
> ByteArrayKey{data=ByteArray{size=8, hashCode=2ada52a1, array=[2, 62, 5, 74, 79, 78, 65, 83, ..]}}
> ByteArrayKey{data=ByteArray{size=8, hashCode=5576b9ea, array=[2, 62, 5, 74, 79, 78, 65, 83, ..]}}
> As you can see the hashCode is differing even though the byte array is the same.
> This is because ByteArrayKey.toString is using Util.printArray(byte[],true) where true means that a hashCode should be printed as well.
> Unfortenaly, the hashcode is calculated with byte[].hashCode() which is not considering the data in the byte array.
> There are several solutions to the problem:
>  * Have another mechanism to export unique ids from the key instead of toString (with a possible toString fallback)
>  * Fix so that ByteArrayKey.toString returns deterministic data. (Still bad solution as the keys will be very long and not make sense).
>  * Special handling for ByteArrayKey to calculate the key based on the bytes in the byte array.

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