Comments (2)
I want to warn against fixing this by treating missing metadata as an interval that did not contain data, as long as s3 remains a possible storage layer. S3 consistency issues in that case will cause us to miss valid buckets.
from druid.
Yes, I think the proper mechanism to fix this is to have it use a similar mechanism to how the determine_partitions job communicates back the partitions: it writes to the local working path (hdfs) and the subsequent job reads from there.
Basically, I think the fix is to have the IndexGeneratorJobs write out the descriptor to the working directory as well as the output directory. The DbUpdaterJob then reads the descriptors from the working directory instead of the output directory. It will look weird to anybody who only uses HDFS and doesn't care about the eventual consistency of S3, but it's not the end of the world.
from druid.
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from druid.