From c19ea0a6f18a3d2bf9c06f9d7e6efee1779686fb Mon Sep 17 00:00:00 2001
From: Nhat Nguyen <nhat.nguyen@elastic.co>
Date: Fri, 10 May 2019 14:27:16 -0400
Subject: [PATCH] Remove global checkpoint assertion in peer recovery (#41987)

If remote recovery copies an index commit which has gaps in sequence
numbers to a follower; then these assertions (introduced in #40823)
don't hold for follower replicas.

Closes #41037
---
 .../org/elasticsearch/indices/recovery/RecoveryTarget.java | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/server/src/main/java/org/elasticsearch/indices/recovery/RecoveryTarget.java b/server/src/main/java/org/elasticsearch/indices/recovery/RecoveryTarget.java
index d0e548aa6b2f0..83ad1dc80c579 100644
--- a/server/src/main/java/org/elasticsearch/indices/recovery/RecoveryTarget.java
+++ b/server/src/main/java/org/elasticsearch/indices/recovery/RecoveryTarget.java
@@ -39,7 +39,6 @@
 import org.elasticsearch.index.mapper.MapperException;
 import org.elasticsearch.index.seqno.ReplicationTracker;
 import org.elasticsearch.index.seqno.RetentionLeases;
-import org.elasticsearch.index.seqno.SequenceNumbers;
 import org.elasticsearch.index.shard.IndexShard;
 import org.elasticsearch.index.shard.IndexShardNotRecoveringException;
 import org.elasticsearch.index.shard.IndexShardState;
@@ -288,9 +287,6 @@ public void prepareForTranslogOperations(boolean fileBasedRecovery, int totalTra
         ActionListener.completeWith(listener, () -> {
             state().getTranslog().totalOperations(totalTranslogOps);
             indexShard().openEngineAndSkipTranslogRecovery();
-            assert indexShard.getGlobalCheckpoint() >= indexShard.seqNoStats().getMaxSeqNo() ||
-                indexShard.indexSettings().getIndexVersionCreated().before(Version.V_7_2_0)
-                : "global checkpoint is not initialized [" + indexShard.seqNoStats() + "]";
             return null;
         });
     }
@@ -399,9 +395,6 @@ public void cleanFiles(int totalTranslogOps, long globalCheckpoint, Store.Metada
             if (indexShard.indexSettings().getIndexVersionCreated().before(Version.V_6_0_0_rc1)) {
                 store.ensureIndexHasHistoryUUID();
             }
-            assert globalCheckpoint >= Long.parseLong(sourceMetaData.getCommitUserData().get(SequenceNumbers.MAX_SEQ_NO))
-                || indexShard.indexSettings().getIndexVersionCreated().before(Version.V_7_2_0) :
-                "invalid global checkpoint[" + globalCheckpoint + "] source_meta_data [" + sourceMetaData.getCommitUserData() + "]";
             final String translogUUID = Translog.createEmptyTranslog(
                 indexShard.shardPath().resolveTranslog(), globalCheckpoint, shardId, indexShard.getPendingPrimaryTerm());
             store.associateIndexWithNewTranslog(translogUUID);