mirror of https://github.com/apache/druid.git
a517f8ce49
Removes the coordinator sanity check that prevents it from dropping all segments. It's useful to get rid of this, since the behavior is unintuitive for dev/testing clusters where users might regularly want to drop all their data to get back to a clean slate. But the sanity check was there for a reason: to prevent a race condition where the coordinator might drop all segments if it ran before the first metadata store poll finished. This patch addresses that concern differently, by allowing methods in MetadataSegmentManager to return null if a poll has not happened yet, and canceling coordinator runs in that case. This patch also makes the "dataSources" reference in SQLMetadataSegmentManager volatile. I'm not sure why it wasn't volatile before, but it seems necessary to me: it's not final, and it's dereferenced from multiple threads without synchronization. |
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