How the index data are managed within the cluster?

Hello

We are evaluating the consistency.

Regarding indexes, am I right in thinking that the data in the index are stored in a (managed internally) cache on the same node that the attendant at the following indexed values? I'm not interested in getting the data in the index, but rather just to understand how the data in the index itself are stored or processed within the cluster.

So in a 2 cluster node where an index is applied to a distributed cache that has only 2 entries, will there be a key cache on each node 1 {binary,} to enter key where the key points to the value that is stored on this same node? In other words, I'm sure that the index data to be spread out in the cluster in the case of a partitioned topology?

Concerning
Peter

user11279467 wrote:
Hello

We are evaluating the consistency.

Regarding indexes, am I right in thinking that the data in the index are stored in a (managed internally) cache on the same node that the attendant at the following indexed values? I'm not interested in getting the data in the index, but rather just to understand how the data in the index itself are stored or processed within the cluster.

So in a 2 cluster node where an index is applied to a distributed cache that has only 2 entries, will there be a key cache on each node 1 {binary,} to enter key where the key points to the value that is stored on this same node? In other words, I'm sure that the index data to be spread out in the cluster in the case of a partitioned topology?

Concerning
Peter

Hi Peter,.

up to 3.4.x index have been supported only on partitioned topology, and Yes, the index on each node contain only the data corresponding to the entries that have their main copy on this node (referred to as entered local subsequently).

The indexes are not stored in a cache, but they are managed under the information that maintains consistency in terms of backup (the map that contains local entries).

The indexes are in 2 parts:

-index to the front: this is a mapping of the cache key in an internal representation (Playback key card in the future) the value extracted with the extractor used to create the index of the entry to membership of the cache key (value extracted later)

-reverse index (aka. reversed card): this is a map of the value extracted from a backup set of the keys of the map of entries which we extract the index key reversed with the extractor used to create the index

The index can be sorted, which means that the index reversed a SortedMap (sort order is the order of the extracted values)

Let's see an example. Assuming you have the contents of the following cache within a particular extension storage node:

A--> Object (PositionX = 5,...)
B--> object (getA = 3,...)
C--> object (getA = 3,...)
D--> object (getA = 4,...)

The index forward in this node will contain:

Binary (A)--> 5
Binary (B)--> 3
Binary (C)--> 3
Binary (D)--> 4

The reverse index will contain:

3--> {Binary (B), Binary (C)}
4--> {Binary (D)}
5--> {Binary (A)}

Where Binary (...) designates the internal representation (binary) of the... object.

If the index is not ordered, then the order of iteration over the entries in the index reversed are not deterministic.

If the index is ordered, the iteration of the entries into the inverted index will be as stated above. Also, you can convert the SortedMap inverted index in order to have the very useful headMap and tailMap and firstKey and lastKey methods.

I hope this helps.

Best regards

Robert

Tags: Fusion Middleware

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