huaxiangsun commented on a change in pull request #2640:
URL: https://github.com/apache/hbase/pull/2640#discussion_r520782327
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File path:
hbase-client/src/main/java/org/apache/hadoop/hbase/client/ReversedClientScanner.java
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@@ -64,7 +64,9 @@ protected boolean setNewStartKey() {
@Override
protected ReversedScannerCallable createScannerCallable() {
+ // In case of meta, we want to support scan over a replica region.
+ int replicaId = (scan.getConsistency() == Consistency.TIMELINE) ?
scan.getReplicaId() : 0;
Review comment:
There is no -1 involved. The flow is like that:
1. If it is Consistency.STRONG, no replica involved.
2. If it is Consistency.TIMELINE, and targetReplicaId is 0, it is the hedged
read behavior (primary first, then go to replicas if no response within
configured interval).
3. If it is Consistency.TIMELINE, and targetReplicaId is a valid replica
id, go to the target replica region within the specified replica id.
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