Arkadiusz Robiński created SOLR-15883:
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Summary: 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
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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