[
https://issues.apache.org/jira/browse/UNOMI-764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17713624#comment-17713624
]
Kevan Jahanshahi commented on UNOMI-764:
----------------------------------------
Each scroll query creates a cursor on the Elasticsearch server, which consumes
system resources, including memory, CPU, and disk I/O.
If you have a high number of concurrent scroll queries running simultaneously,
it can lead to increased resource utilization and potentially cause performance
issues or even out-of-memory errors if the system is not adequately configured
to handle the load.
This is especially true when dealing with large indices with a high volume of
data. (lot of profiles, lot of sessions in case of the merge)Seem’s there is a
ES parameter to limit the number of concurrent scroll queries:
{{max_concurrent_scroll_requests}}
{{{}{}}}But for me scrolling in the merge action that can be called
concurrently many time is a resource killer.
We never expect tons of profiles/sessions to be retrieved from the queries done
in the merge action, also in unomi 2_x improvements have been done to schedule
and defer asynchronously some part of the logic to free the request faster.
> Profile merge system is doing a lot of scroll queries
> -----------------------------------------------------
>
> Key: UNOMI-764
> URL: https://issues.apache.org/jira/browse/UNOMI-764
> Project: Apache Unomi
> Issue Type: Bug
> Affects Versions: unomi-2.2.0, unomi-1.8.0
> Reporter: Kevan Jahanshahi
> Priority: Major
> Fix For: unomi-2.3.0, unomi-1.9.0
>
>
> We experienced issues with profile merge action with errors like:
> {code:java}
> java.lang.Exception: Error loading itemType=org.apache.unomi.api.Profile
> itemId=a9abefb6-8e21-4a0b-9a38-92c8e2fcf512
> at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl$6.execute(ElasticSearchPersistenceServiceImpl.java:772)
> ~[?:?]
> at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl$6.execute(ElasticSearchPersistenceServiceImpl.java:740)
> ~[?:?]
> at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl$InClassLoaderExecute.executeInClassLoader(ElasticSearchPersistenceServiceImpl.java:2233)
> ~[?:?]
> at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl$InClassLoaderExecute.catchingExecuteInClassLoader(ElasticSearchPersistenceServiceImpl.java:2244)
> ~[?:?]
> at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl.load(ElasticSearchPersistenceServiceImpl.java:780)
> ~[?:?]
> at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl.load(ElasticSearchPersistenceServiceImpl.java:735)
> ~[?:?]
> at Proxy6d4b2959_6bef_4c34_bb5a_88734cd23613.load(Unknown Source) ~[?:?]
> at
> org.apache.unomi.plugins.baseplugin.actions.MergeProfilesOnPropertyAction$1.execute(MergeProfilesOnPropertyAction.java:226)
> ~[?:?]
> at
> org.apache.unomi.services.impl.events.EventServiceImpl.send(EventServiceImpl.java:175)
> ~[?:?]
> at
> org.apache.unomi.services.impl.events.EventServiceImpl.send(EventServiceImpl.java:144)
> ~[?:?]
> at
> org.apache.unomi.rest.service.impl.RestServiceUtilsImpl.handleEvents(RestServiceUtilsImpl.java:112)
> ~[?:?]
> at
> org.apache.unomi.rest.endpoints.ContextJsonEndpoint.handleRequest(ContextJsonEndpoint.java:364)
> ~[?:?]
> at
> org.apache.unomi.rest.endpoints.ContextJsonEndpoint.contextJSONAsPost(ContextJsonEndpoint.java:311)
> ~[?:?]{code}
> {code:java}
> Caused by: org.elasticsearch.ElasticsearchStatusException: Elasticsearch
> exception [type=circuit_breaking_exception, reason=[parent] Data too large,
> data for [indices:data/read/get[s]] would be [8308883688/7.7gb], which is
> larger than the limit of [8160437862/7.5gb], real usage: [8308883456/7.7gb],
> new bytes reserved: [232/232b], usages [request=0/0b, fielddata=36816/35.9kb,
> in_flight_requests=232/232b, model_inference=0/0b, eql_sequence=0/0b,
> accounting=106608640/101.6mb]] at
> org.elasticsearch.rest.BytesRestResponse.errorFromXContent(BytesRestResponse.java:177)
> ~[?:?] at
> org.elasticsearch.client.RestHighLevelClient.parseEntity(RestHighLevelClient.java:1727)
> ~[?:?] at
> org.elasticsearch.client.RestHighLevelClient.parseResponseException(RestHighLevelClient.java:1704)
> ~[?:?] at
> org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1467)
> ~[?:?] at
> org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1424)
> ~[?:?] at
> org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1394)
> ~[?:?] at
> org.elasticsearch.client.RestHighLevelClient.get(RestHighLevelClient.java:714)
> ~[?:?] at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl$6.execute(ElasticSearchPersistenceServiceImpl.java:757)
> ~[?:?] ... 99 more Suppressed: org.elasticsearch.client.ResponseException:
> method [GET], host [https://********:9220], URI
> [/context-profile/_doc/a9abefb6-8e21-4a0b-9a38-92c8e2fcf512], status line
> [HTTP/1.1 429 Too Many Requests]
> {"error":{"root_cause":[{"type":"circuit_breaking_exception","reason":"[parent]
> Data too large, data for [indices:data/read/get[s]] would be
> [8308883688/7.7gb], which is larger than the limit of [8160437862/7.5gb],
> real usage: [8308883456/7.7gb], new bytes reserved: [232/232b], usages
> [request=0/0b, fielddata=36816/35.9kb, in_flight_requests=232/232b,
> model_inference=0/0b, eql_sequence=0/0b,
> accounting=106608640/101.6mb]","bytes_wanted":8308883688,"bytes_limit":8160437862,"durability":"PERMANENT"}],"type":"circuit_breaking_exception","reason":"[parent]
> Data too large, data for [indices:data/read/get[s]] would be
> [8308883688/7.7gb], which is larger than the limit of [8160437862/7.5gb],
> real usage: [8308883456/7.7gb], new bytes reserved: [232/232b], usages
> [request=0/0b, fielddata=36816/35.9kb, in_flight_requests=232/232b,
> model_inference=0/0b, eql_sequence=0/0b,
> accounting=106608640/101.6mb]","bytes_wanted":8308883688,"bytes_limit":8160437862,"durability":"PERMANENT"},"status":429}
> at org.elasticsearch.client.RestClient.convertResponse(RestClient.java:253)
> ~[?:?] at
> org.elasticsearch.client.RestClient.performRequest(RestClient.java:231)
> ~[?:?] at
> org.elasticsearch.client.RestClient.performRequest(RestClient.java:205)
> ~[?:?] at
> org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1454)
> ~[?:?] at
> org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1424)
> ~[?:?] at
> org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1394)
> ~[?:?] at
> org.elasticsearch.client.RestHighLevelClient.get(RestHighLevelClient.java:714)
> ~[?:?] at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl$6.execute(ElasticSearchPersistenceServiceImpl.java:757)
> ~[?:?] at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl$6.execute(ElasticSearchPersistenceServiceImpl.java:740)
> ~[?:?] at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl$InClassLoaderExecute.executeInClassLoader(ElasticSearchPersistenceServiceImpl.java:2233)
> ~[?:?] at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl$InClassLoaderExecute.catchingExecuteInClassLoader(ElasticSearchPersistenceServiceImpl.java:2244)
> ~[?:?] at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl.load(ElasticSearchPersistenceServiceImpl.java:780)
> ~[?:?] at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl.load(ElasticSearchPersistenceServiceImpl.java:735)
> ~[?:?] at Proxy6d4b2959_6bef_4c34_bb5a_88734cd23613.load(Unknown Source)
> ~[?:?] at
> org.apache.unomi.plugins.baseplugin.actions.MergeProfilesOnPropertyAction$1.execute(MergeProfilesOnPropertyAction.java:226)
> ~[?:?] at
> org.apache.unomi.services.impl.events.EventServiceImpl.send(EventServiceImpl.java:175)
> ~[?:?] at
> org.apache.unomi.services.impl.events.EventServiceImpl.send(EventServiceImpl.java:144)
> ~[?:?] at
> org.apache.unomi.rest.service.impl.RestServiceUtilsImpl.handleEvents(RestServiceUtilsImpl.java:112)
> ~[?:?] at
> org.apache.unomi.rest.endpoints.ContextJsonEndpoint.handleRequest(ContextJsonEndpoint.java:364)
> ~[?:?] at
> org.apache.unomi.rest.endpoints.ContextJsonEndpoint.contextJSONAsPost(ContextJsonEndpoint.java:311)
> ~[?:?]
> {code}
> Or:
> {code:java}
> Error while executing in class loader
> java.lang.Exception: Error loading itemType=org.apache.unomi.api.Profile
> query={
> "bool" : {
> "must" : [
> {
> "match_all" : {
> "boost" : 1.0
> }
> }
> ],
> "filter" : [
> {
> "bool" : {
> "must" : [
> {
> "term" : {
> "systemProperties.mergeIdentifier" : {
> "value" : "**********************",
> "boost" : 1.0
> }
> }
> },
> {
> "bool" : {
> "must_not" : [
> {
> "exists" : {
> "field" : "mergedWith",
> "boost" : 1.0
> }
> }
> ],
> "adjust_pure_negative" : true,
> "boost" : 1.0
> }
> }
> ],
> "adjust_pure_negative" : true,
> "boost" : 1.0
> }
> }
> ],
> "adjust_pure_negative" : true,
> "boost" : 1.0
> }
> } sortBy=properties.firstVisit
> at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl$24.execute(ElasticSearchPersistenceServiceImpl.java:1757)
> ~[?:?]
> at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl$24.execute(ElasticSearchPersistenceServiceImpl.java:1650)
> ~[?:?]
> at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl$InClassLoaderExecute.executeInClassLoader(ElasticSearchPersistenceServiceImpl.java:2233)
> ~[?:?]
> at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl$InClassLoaderExecute.catchingExecuteInClassLoader(ElasticSearchPersistenceServiceImpl.java:2244)
> ~[?:?]
> at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl.query(ElasticSearchPersistenceServiceImpl.java:1767)
> ~[?:?]
> at
> org.apache.unomi.persistence.elasticsearch.ElasticSearchPersistenceServiceImpl.query(ElasticSearchPersistenceServiceImpl.java:1570)
> ~[?:?]
> at Proxy6d4b2959_6bef_4c34_bb5a_88734cd23613.query(Unknown Source)
> ~[?:?]
> at
> org.apache.unomi.plugins.baseplugin.actions.MergeProfilesOnPropertyAction.execute(MergeProfilesOnPropertyAction.java:94)
> ~[?:?]
> at
> org.apache.unomi.services.actions.impl.ActionExecutorDispatcherImpl$8.execute(ActionExecutorDispatcherImpl.java:227)
> ~[?:?]
> at
> org.apache.unomi.services.actions.impl.ActionExecutorDispatcherImpl$8.execute(ActionExecutorDispatcherImpl.java:224)
> ~[?:?]
> at
> org.apache.unomi.metrics.MetricAdapter.runWithTimer(MetricAdapter.java:38)
> ~[?:?]
> at
> org.apache.unomi.services.actions.impl.ActionExecutorDispatcherImpl.execute(ActionExecutorDispatcherImpl.java:229)
> ~[?:?]
> at
> org.apache.unomi.services.impl.rules.RulesServiceImpl.onEvent(RulesServiceImpl.java:327)
> ~[?:?]
> at
> org.apache.unomi.services.impl.events.EventServiceImpl.send(EventServiceImpl.java:170)
> ~[?:?]
> at
> org.apache.unomi.services.impl.events.EventServiceImpl.send(EventServiceImpl.java:144)
> ~[?:?]
> at
> org.apache.unomi.rest.service.impl.RestServiceUtilsImpl.handleEvents(RestServiceUtilsImpl.java:112)
> ~[?:?]
> at
> org.apache.unomi.rest.endpoints.ContextJsonEndpoint.handleRequest(ContextJsonEndpoint.java:364)
> ~[?:?]
> at
> org.apache.unomi.rest.endpoints.ContextJsonEndpoint.contextJSONAsPost(ContextJsonEndpoint.java:311)
> ~[?:?] {code}
> The merge is doing scroll queries from code:
> {code:java}
> List<Profile> profiles = persistenceService.query(c, "properties.firstVisit",
> Profile.class, 0, maxProfilesInOneMerge).getList(); {code}
> Where *maxProfilesInOneMerge* is by default set to {*}-1{*}, in persistence
> service when doing a query using size {*}-1{*}:
> {code:java}
> if (size == Integer.MIN_VALUE) {
> searchSourceBuilder.size(defaultQueryLimit);
> } else if (size != -1) {
> searchSourceBuilder.size(size);
> } else {
> // size == -1, use scroll query to retrieve all the results
> searchRequest.scroll(keepAlive);
> } {code}
> With a *keepAlive* of 1hour by default. So that can be a lot, in case of lot
> merge requests happen in a short period of time, the scroll will accumulate
> in RAM.
>
> The workaround is to set the *maxProfilesInOneMerge* to something else than
> *-1* to avoid scroll queries.
> For that we can use this configuration:
> * Unomi config: *org.apache.unomi.plugins.base.maxProfilesInOneMerge*
> * Env config: *UNOMI_MAX_PROFILES_IN_ONE_MERGE*
> A value of *10* seem's good as we never expect a lot of profiles to be merged
> together.
> *But for the current ticket we should fix the default value and we should
> never do scroll queries at all at that place. Creating a new scroll on every
> request is a bad idea.*
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
