Disable shard idle with segment replication. #4118
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This change disables shard idle when segment replication is enabled. Primary shards will only push out new segments on refresh, we do not want to block this based on search behavior. Replicas will only refresh on an externally provided SegmentInfos, so we do not want search requests to hang waiting for a refresh. Signed-off-by: Marc Handalian <[email protected]>
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@@ Coverage Diff @@
## main #4118 +/- ##
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+ Coverage 70.61% 70.63% +0.02%
- Complexity 56983 57083 +100
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Files 4595 4595
Lines 274234 274299 +65
Branches 40181 40185 +4
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+ Hits 193638 193749 +111
+ Misses 64342 64303 -39
+ Partials 16254 16247 -7
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aabukhalil
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Aug 3, 2022
Bukhtawar
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Rishikesh1159
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This change disables shard idle when segment replication is enabled. Primary shards will only push out new segments on refresh, we do not want to block this based on search behavior. Replicas will only refresh on an externally provided SegmentInfos, so we do not want search requests to hang waiting for a refresh. Signed-off-by: Marc Handalian <[email protected]>
Rishikesh1159
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…aining segment replication changes (#4243) * [Segment Replication] Checkpoint Replay on Replica Shard (#3658) * Adding Latest Recevied checkpoint, replay checkpoint logic along with tests Signed-off-by: Rishikesh1159 <[email protected]> * [Segment Replication] Wire up segment replication with peer recovery and add ITs. (#3743) * Add null check when computing max segment version. With segment replication enabled it is possible Lucene does not set the SegmentInfos min segment version, leaving the default value as null. Signed-off-by: Marc Handalian <[email protected]> * Update peer recovery to set the translogUUID of replicas to the UUID generated on the primary. This change updates the UUID when the translog is created to the value stored in the passed segment userdata. This is to ensure during failover scenarios that the replica can be promoted and not have a uuid mismatch with the value stored in user data. Signed-off-by: Marc Handalian <[email protected]> * Wire up Segment Replication under the feature flag. This PR wires up segment replication and adds some initial integration tests. Signed-off-by: Marc Handalian <[email protected]> * Add test to ensure replicas use primary translog uuid with segrep. Signed-off-by: Marc Handalian <[email protected]> * Update SegmentReplicationIT to assert previous commit points are valid and SegmentInfos can be built. Fix nitpicks in PR feedback. Signed-off-by: Marc Handalian <[email protected]> * Fix test with Assert.fail to include a message. Signed-off-by: Marc Handalian <[email protected]> * Disable shard idle with segment replication. (#4118) This change disables shard idle when segment replication is enabled. Primary shards will only push out new segments on refresh, we do not want to block this based on search behavior. Replicas will only refresh on an externally provided SegmentInfos, so we do not want search requests to hang waiting for a refresh. Signed-off-by: Marc Handalian <[email protected]> * Fix isAheadOf logic for ReplicationCheckpoint comparison (#4112) Signed-off-by: Suraj Singh <[email protected]> * Fix waitUntil refresh policy for segrep enabled indices. (#4137) Signed-off-by: Marc Handalian <[email protected]> * Add IndexShard#getLatestReplicationCheckpoint behind segrep enable feature flag (#4163) * Add IndexShard#getLatestReplicationCheckpoint behind segrep enable feature flag Signed-off-by: Suraj Singh <[email protected]> * Address review comment. Move tests to SegmentReplicationIndexShardTests Signed-off-by: Suraj Singh <[email protected]> * Add segrep enbaled index settings in TargetServiceTests, SourceHandlerTests Signed-off-by: Suraj Singh <[email protected]> * [Segment Replication] Fix OngoingSegmentReplications to key by allocation ID instead of DiscoveryNode. (#4182) * Fix OngoingSegmentReplications to key by allocation ID instead of DiscoveryNode. This change fixes segrep to work with multiple shards per node by keying ongoing replications on allocation ID. This also updates cancel methods to ensure state is properly cleared on shard cancel. Signed-off-by: Marc Handalian <[email protected]> * Clean up cancel methods. Signed-off-by: Marc Handalian <[email protected]> Signed-off-by: Marc Handalian <[email protected]> * [Bug] [Segment Replication] Update store metadata recovery diff logic to ignore missing files causing exception (#4185) * Update Store for segment replication dif Signed-off-by: Poojita Raj <[email protected]> Signed-off-by: Poojita Raj <[email protected]> * Update recoveryDiff logic to ingore missing files causing exception on replica during copy Signed-off-by: Suraj Singh <[email protected]> * Address review comments Signed-off-by: Suraj Singh <[email protected]> Signed-off-by: Poojita Raj <[email protected]> Signed-off-by: Suraj Singh <[email protected]> Co-authored-by: Poojita Raj <[email protected]> * [Segment Replication] Adding PrimaryMode check before publishing checkpoint and processing a received checkpoint. (#4157) * Adding PrimaryMode check before publishing checkpoint. Signed-off-by: Rishikesh1159 <[email protected]> * Applying spotless check Signed-off-by: Rishikesh1159 <[email protected]> * Moving segrep specific tests to SegmentReplicationIndexShardTests. Signed-off-by: Rishikesh1159 <[email protected]> * Adding logic and tests for rejecting checkpoints if shard is in PrimaryMode. Signed-off-by: Rishikesh1159 <[email protected]> * Applying ./gradlew :server:spotlessApply. Signed-off-by: Rishikesh1159 <[email protected]> * Applying ./gradlew :server:spotlessApply Signed-off-by: Rishikesh1159 <[email protected]> * Changing log level to warn in shouldProcessCheckpoint() of IndexShard.java class. Signed-off-by: Rishikesh1159 <[email protected]> * Removing unnecessary lazy logging in shouldProcessCheckpoint(). Signed-off-by: Rishikesh1159 <[email protected]> Signed-off-by: Rishikesh1159 <[email protected]> * [Segment Replication] Wait for documents to replicate to replica shards (#4236) * [Segment Replication] Add thread sleep to account for replica lag in delete operations test Signed-off-by: Suraj Singh <[email protected]> * Address review comments, assertBusy on doc count rather than sleep Signed-off-by: Suraj Singh <[email protected]> Signed-off-by: Suraj Singh <[email protected]> * Segment Replication - Remove unnecessary call to markAllocationIdAsInSync. (#4224) This PR Removes an unnecessary call to markAllocationIdAsInSync on the primary shard when replication events complete. Recovery will manage this initial call. Signed-off-by: Marc Handalian <[email protected]> Signed-off-by: Marc Handalian <[email protected]> * Segment Replication - Add additional unit tests for update & delete ops. (#4237) * Segment Replication - Add additional unit tests for update & delete operations. Signed-off-by: Marc Handalian <[email protected]> * Fix spotless. Signed-off-by: Marc Handalian <[email protected]> Signed-off-by: Marc Handalian <[email protected]> Signed-off-by: Rishikesh1159 <[email protected]> Signed-off-by: Marc Handalian <[email protected]> Signed-off-by: Suraj Singh <[email protected]> Signed-off-by: Poojita Raj <[email protected]> Co-authored-by: Marc Handalian <[email protected]> Co-authored-by: Suraj Singh <[email protected]> Co-authored-by: Poojita Raj <[email protected]>
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Signed-off-by: Marc Handalian [email protected]
Description
This change disables shard idle when segment replication is enabled.
Primary shards will only push out new segments on refresh, we do not want to block this based on search behavior.
Replicas will only refresh on an externally provided SegmentInfos, so we do not want search requests to hang waiting for a refresh.
To achieve this - on replicas NRTReplicationEngine will never return that a refresh is needed, all refreshes will originate from within the engine itself. This also avoids the step of reading and comparing isCurrent on the latest reader, which for segrep will use StandardDirectoryReader without a writer and performs an IO operation to read the on-disk SegmentInfos. For Primary shards, the index setting is read during scheduleRefresh that controls if a refresh is pending.
This PR also introduces a method in IndexShardTestCase to improve the quality of segrep unit level tests by actually performing copy events.
Issues Resolved
closes #3834
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