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Piotr Kołaczkowski updated CASSANDRA-6268: ------------------------------------------ Attachment: 0001-DSP-2572-Adds-ability-to-set-target-DCs-where-a-Hado.patch > Poor performance of Hadoop if any DC is using VNodes > ---------------------------------------------------- > > Key: CASSANDRA-6268 > URL: https://issues.apache.org/jira/browse/CASSANDRA-6268 > Project: Cassandra > Issue Type: Improvement > Components: Hadoop > Reporter: Piotr Kołaczkowski > Assignee: Piotr Kołaczkowski > Attachments: > 0001-DSP-2572-Adds-ability-to-set-target-DCs-where-a-Hado.patch > > > Some customers are complaining about huge number of splits in Hadoop caused > by VNodes. Disabling vnodes only in Hadoop DC does not fix it, because splits > are generated from the results of describe_ring, which returns a huge number > of ranges. > The proposed fix: > - allows for specifying the DCs the Hadoop job should be run > - merges the consecutive ranges before generating Hadoop splits, so we don't > have artificial range splitting caused by vnodes in the other DCs -- This message was sent by Atlassian JIRA (v6.1#6144)