Benoit Tellier created JAMES-3769:
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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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