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Add sharded DNS publishing capability

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This enables sharded DNS publishing on a per-TLD basis. Instead of a TLD-wide lock, the sharded scheme locks each update on the shard number, allowing parallel writes to DNS.

We allow N (the number of shards) to be 0 or 1 for no sharding, and N > 1 for an N-way sharding scheme. Unless explicitly set, all TLDs default to a numShards of 0, so we don't have to reload all registry objects explicitly.

WARNING: This will change the lock name upon deployment for the PublishDnsAction from "<TLD> Dns Updates" to "<TLD> Dns Updates shard 0". This may cause concurrency issues if the underlying DNSWriter is not parallel-write tolerant (currently all production usages are ZonemanWriter, which is parallel-tolerant, so no issues are expected).

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=187525655
This commit is contained in:
larryruili 2018-03-01 13:33:46 -08:00 • committed by jianglai
parent 24799b394d
commit fa989e754b
16 changed files with 474 additions and 64 deletions
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2
java/google/registry/dns/DnsMetrics.java
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@ -41,7 +41,7 @@ public class DnsMetrics {
public enum CommitStatus { SUCCESS, FAILURE }
/** Disposition of the publish action. */
public enum ActionStatus { SUCCESS, COMMIT_FAILURE, LOCK_FAILURE, BAD_WRITER }
public enum ActionStatus { SUCCESS, COMMIT_FAILURE, LOCK_FAILURE, BAD_WRITER, BAD_LOCK_INDEX }
private static final ImmutableSet<LabelDescriptor> LABEL_DESCRIPTORS_FOR_PUBLISH_REQUESTS =
ImmutableSet.of(