[jira] Commented: (SOLR-810) changes for javabin format

["Noble Paul (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12640063#action_12640063 ] 

Noble Paul commented on SOLR-810:
---------------------------------

javabin can be as efficient as a format like say thrift/protocol buffers if we could not pay the price of a string per name. We can easily achieve it using a new type  KNOWN_STRING. 

KNOWN_STRING can be like an EXTERN_STRING but it is just that these are preconfigured string names which is a map of index -> string . The known string list can probably have a version . The client must be using a newer version known string list than the server . 

an example looks like
{code}
1:responseHeader
2:QTime
3:status
{code}

A newer version of the string list can add a new string at a new index but it must never change the index of an existing string. This is similar to an IDL file of thrift/protocol buffers but w/o any of those complexities

So when an EXTERN_STRING is written it first looks up in the KNOWN_STRING map. If it is present , it is written as a KNOWN_STRING instead of an EXTERN_STRING . The value will be the index

It can be a new type in the first 5 bits but that will make it take 2 bytes per name. we do not have any extra type in the last 3 bits , but we can have only one type for NamedList/SimpleOrderedMap and take up the other .

> changes for javabin format
> --------------------------
>
>                 Key: SOLR-810
>                 URL: https://issues.apache.org/jira/browse/SOLR-810
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Noble Paul
>
> This is really not an issue . But if we ever are going to make any changes to the next version of javabin let us not miss anything .Any new suggestions could also be welcome
> 1) support UUID

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