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add a comment why and when we can ignore skipTranslogRecovery in IndexShard

This commit is contained in:
Simon Willnauer 2016-03-31 15:54:21 +02:00
parent 4657796b24
commit ea055d2ac9
1 changed files with 7 additions and 0 deletions
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7
core/src/main/java/org/elasticsearch/index/shard/IndexShard.java
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@ -882,6 +882,13 @@ public class IndexShard extends AbstractIndexShardComponent {
} }
recoveryState.setStage(RecoveryState.Stage.TRANSLOG); recoveryState.setStage(RecoveryState.Stage.TRANSLOG);
final EngineConfig.OpenMode openMode; final EngineConfig.OpenMode openMode;
/* by default we recover and index and replay the translog but if the index
* doesn't exist we create everything from the scratch. Yet, if the index
* doesn't exist we don't need to worry about the skipTranslogRecovery since
* there is no translog on a non-existing index.
* The skipTranslogRecovery invariant is used if we do remote recovery since
* there the translog isn't local but on the remote host, hence we can skip it.
*/
if (indexExists == false) { if (indexExists == false) {
openMode = EngineConfig.OpenMode.CREATE_INDEX_AND_TRANSLOG; openMode = EngineConfig.OpenMode.CREATE_INDEX_AND_TRANSLOG;
} else if (skipTranslogRecovery) { } else if (skipTranslogRecovery) {