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https://issues.apache.org/jira/browse/SOLR-15883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17467894#comment-17467894
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Arkadiusz Robiński commented on SOLR-15883:
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Pull request with a potential fix: https://github.com/apache/solr/pull/488
> OpenExchangeRatesOrgProvider downloads currencies during a search request and
> can cause a request timeout
> ---------------------------------------------------------------------------------------------------------
>
> Key: SOLR-15883
> URL: https://issues.apache.org/jira/browse/SOLR-15883
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Arkadiusz Robiński
> Priority: Minor
>
> In OpenExchangeRatesOrgProvider.java there is a method getExchangeRate which
> is called during a search request, when a currency convertion is needed (eg.
> when filtering or sorting by a field of type solr.CurrencyFieldType). Before
> it returns the exchange rate, it calls reloadIfExpired(), which checks if the
> configured amount of time passed since the last reload and then fetches data
> from openexchangerates.org. If there is any delay (eg. the
> openexchangerates.org server takes long to respond), it will just wait for
> the response and block the thread. Maybe there is a timeout, but still, it
> will block a search thread until it timeouts. If timeAllowed is used in the
> search request, the request will end with an error when timeAllowed passes.
> Also, I don't see any locks or any synchronization there, so I think it tries
> to download the exchange rates in every search thread that uses a currency
> field. If there is an outage of openexchangerates.org, all search requests
> are blocked until openexchangerates.org is available again.
> There should be an option to have the currency rates downloaded in a thread
> that is not related to a search request.
> One idea for a fix is to have an option to reload exchange rates when a new
> searcher is opened, similarly to ExternalFileFieldReloader.
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