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mck commented on CASSANDRA-4886: -------------------------------- AFAIK everything thrift related is frozen :( so i presume the patch isn't going to be applied to master. > Remote ColumnFamilyInputFormat > ------------------------------ > > Key: CASSANDRA-4886 > URL: https://issues.apache.org/jira/browse/CASSANDRA-4886 > Project: Cassandra > Issue Type: Improvement > Components: Hadoop > Reporter: Scott Fines > Fix For: 3.0 > > Attachments: CASSANDRA-4886.patch > > > As written, the ColumnFamilyInputFormat does not have a great deal of fault > tolerance. > It only attempts to perform a read from a single replica, with an infinite > timeout. If that replica is not available, then the Task fails, and must be > retried on a different node. > This is fine if the TaskTrackers are colocated with Cassandra nodes, but is > very fragile when this is not possible. When the Tasktrackers are remote to > cassandra, the same rules about clients should apply--there should be a > strict (configurable) timeout, and the ability to retry requests on a > different replica if at single request fails. > It seems obvious that we'd want to support both types of architecture; to do > that, we should probably have a configuration which allows the user to > specify his architecture choices explicitely. -- This message was sent by Atlassian JIRA (v6.3.4#6332)