Kevan Jahanshahi created UNOMI-670:
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Summary: Unomi purge system is not working
Key: UNOMI-670
URL: https://issues.apache.org/jira/browse/UNOMI-670
Project: Apache Unomi
Issue Type: Bug
Components: unomi(-core)
Affects Versions: unomi-1.6.1, unomi-2.0.0
Reporter: Kevan Jahanshahi
h2. Bug 1: disabling the profile purge will end up with all profiles to be
purge everyday
Using this conf:
{code:java}
org.apache.unomi.profile.purge.existTime = -1
org.apache.unomi.profile.purge.inactiveTime = -1
org.apache.unomi.monthly.index.purge.existTime= 12 {code}
To only enable events/session purge will have a bad side effect: all profiles
of the system will be removed everyday.
h2. bug 2: OOM issue for profile purge.
The persistence service is implementing a method:
{code:java}
/**
* Deletes items with the specified Item subclass matching the specified {@link
Condition}.
*
* @param <T> the type of the Item subclass we want to delete
* @param query a {@link Condition} identifying which elements we want to delete
* @param clazz the {@link Item} subclass of the items we want to delete
* @return {@code true} if the deletion was successful, {@code false} otherwise
*/
<T extends Item> boolean removeByQuery(Condition query, Class<T> clazz); {code}
The issue with the implem is that it's doing the following:
* query profiles to get the IDs of documents
* building a batch request with a delete request per profile ID
* sending the batch.
So in case of a lot profiles to be purge at once, the batch can grow a lot, and
consume all the memory available.
We should not do like that, instead we should:
* just use the ES query:
[https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-delete-by-query.html]
directly with the query to identify the profiles
h2. Bug 3: What is the cache system implemented in the persistence service.
Seem's coming from: https://issues.apache.org/jira/browse/UNOMI-166
It's used by the persistence service, and it explain why the removeByQuery
implem is bad.
The reason why the *removeByQuery* is querying all the documents IDs is to
invalidate the cache.
But it's strange, the cache system is not used at all:
{code:java}
<cm:property name="itemClassesToCache" value="" /> {code}
So I would say, we should remove this cache system, because:
* it's not tested
* nobody know what would be the effect if enabled
* it's not possible to activate it with ENV conf, or global unomi conf.
* it's not documented
* it's impacting implems like: removeByQuery, even if the cache system is not
used
* it's mostly dead code inside the core persistence of Unomi, witch is
dangerous to keep.
h2. Bug 4: Purge job seem's never unregistered.
We do register the purge job when the profile service is started, but in case
the profile service is stopped (stop the bundle for example). Then it's not
unregistered.
h2. Bug 5: what should we do in case of unomi cluster, should all of them do
the purge ?
In case of unomi cluster, all of them may try to trigger the purge, I dont
think it's an issue, but it look like something could be done to avoid doing
unecessary operations twice or more.
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