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Question 1:
What keeps the druid middlemanager away from pushing the indexed segments to HDFS and advertising them to zookeeper?
Question 2:
After a restart of the middlemanager, the old indexed data (that seems to be gone in the coordinator console) is still available in the basetaskdir. How am I able to push and advertise the missing segments to the historical node via HDFS manually?
Thanks in advance,
Constantin
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Restarting a middle manager fails all tasks. We use replication for HA for middle managers, although https://github.com/druid-io/druid/pull/1521 should make restarting them easier.
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Considering that you are using kafka firehose, You can setup either sharding or replication. If you are already setup to shard, unfortunately, you can't get replication (this is something we are actively working on and will fix in future versions of kafka firehose).
However, if you are not doing sharding then you can setup for replication and there will be no duplication. Druid takes care of choosing only one of the replicated segments when preparing query results.
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