[jira] [Created] (JAMES-3769) ElasticSearch search overrides

["Benoit Tellier (Jira)" <se...@james.apache.org>]

Benoit Tellier created JAMES-3769:
-------------------------------------

             Summary: ElasticSearch search overrides
                 Key: JAMES-3769
                 URL: https://issues.apache.org/jira/browse/JAMES-3769
             Project: James Server
          Issue Type: Improvement
          Components: elasticsearch
            Reporter: Benoit Tellier


h3. Context

IMAP SEARCH requests can of course be used for user searches. But many applications (eg Samsung email client) also uses
IMAP SEARCH for resynchronization.

The use of ElasticSearch in the context of resynchronization is a problem as:

 - Resynchronization incurs many requests that ElasticSearch is not made to cope with.
 - This have a performance impact and some 60+ seconds can be spotted.
 - ElasticSearch indexing is asynchronous wich is not ideal for resynchronization
 - An ElasticSearch downtime would imply a full downtime for these clients.
 
Those resynchronization queries would better be served by the metadata database

h3. Decision

Define an API, `SearchOverride` that can be called on matching search queries and thus offload ElasticSearch.

Provide an extension mechanism for search overrides, where potentially custom implementations can be loaded from the
configuration.

Provide well targeted `SearchOverride`, implemented on top of `Cassandra` database.

h3. Consequences

We expect to :

 - Observe less IMAP SEARCH slow requests
 - ElasticSearch downtime should not impact IMAP clients using IMAP SEARCH like IMAP Samsung application
 - Thus also be able to support a higher IMAP workload as Cassandra is more suited to resynchronisation requests

## Sample IMAP requests

{code:java}
SearchOperation{key=SearchKey{type=TYPE_UID, date=null, size=0, value=null, seconds=-1, modSeq=-1, uids=[IdRange : TYPE: FROM UID: MessageUid{uid=1}:MessageUid{uid=9223372036854775807}], sequences=null, keys=Optional.empty}, options=[]}
{code}

{code:java}
SearchOperation{key=SearchKey{type=TYPE_AND, date=null, size=0, value=null, seconds=-1, modSeq=-1, uids=null, sequences=null, keys=Optional[[
    SearchKey{type=TYPE_SEQUENCE_SET, date=null, size=0, value=null, seconds=-1, modSeq=-1, uids=null, sequences=[IdRange ( 1->9223372036854775807 )], keys=Optional.empty}, 
    SearchKey{type=TYPE_DELETED, date=null, size=0, value=null, seconds=-1, modSeq=-1, uids=null, sequences=null, keys=Optional.empty}]]},
    options=[COUNT]}
{code}

{code:java}
SearchOperation{key=SearchKey{type=TYPE_AND, date=null, size=0, value=null, seconds=-1, modSeq=-1, uids=null, sequences=null, keys=Optional[[
    SearchKey{type=TYPE_UID, date=null, size=0, value=null, seconds=-1, modSeq=-1, uids=[IdRange : TYPE: FROM UID: MessageUid{uid=1}:MessageUid{uid=9223372036854775807}], sequences=null, keys=Optional.empty}, 
    SearchKey{type=TYPE_UNSEEN, date=null, size=0, value=null, seconds=-1, modSeq=-1, uids=null, sequences=null, keys=Optional.empty}]]}, options=[COUNT]}
{code}

{code:java}
SearchOperation{key=SearchKey{type=TYPE_AND, date=null, size=0, value=null, seconds=-1, modSeq=-1, uids=null, sequences=null, keys=Optional[[
    SearchKey{type=TYPE_SEQUENCE_SET, date=null, size=0, value=null, seconds=-1, modSeq=-1, uids=null, sequences=[IdRange ( 1->9223372036854775807 )], keys=Optional.empty}, 
     SearchKey{type=TYPE_NOT, date=null, size=0, value=null, seconds=-1, modSeq=-1, uids=null, sequences=null, keys=Optional[[
        SearchKey{type=TYPE_DELETED, date=null, size=0, value=null, seconds=-1, modSeq=-1, uids=null, sequences=null, keys=Optional.empty}]]}]]}, options=[ALL]}
{code}

{code:java}
SearchOperation{key=SearchKey{type=TYPE_ALL, date=null, size=0, value=null, seconds=-1, modSeq=-1, uids=null, sequences=null, keys=Optional.empty}, options=[]}
{code}



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