Hi Igniters, There is an issue IGNITE-8892 [1] related to OOM during distributed query execution. This issue is not limited with ScanQuery usage and looks like affected all query types.
The use case is quite simple. 1 server and 1 client. Client starts scan query with default flags and iterate over cursor. If whole query result is not fit to memory - JVM will crashed with OOM, but it is not expected as client takes entries one by one and throw out them immediately. Reproducer is attached to the ticket. Same query works fine if query starts on server. Seems, we have no DistributedQueryFuture in that case and all works fine. I've found GridCacheDistributedQueryFuture collects all entries and try to return the collection via onDone(). This behaviour turn on with a flag 'keepAll' which is true by default. Iterating over cache via cache.iterator() has no OOM issues as we set keepAll flag to false. Why we have keepAll=true by default as seems noone expects future.get() will return any data and all queries works through queue in paging mode? Will it be ok to get rid of 'allCol' and keepAll flag at all? I've made a PR and TC looks fine. Could someone review it, please? [1] https://issues.apache.org/jira/browse/IGNITE-8892 -- Best regards, Andrey V. Mashenkov
