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From "huaxiang sun (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-18247) Hbck to fix the case that replica region shows as key in the meta table
Date Wed, 21 Jun 2017 00:27:00 GMT
huaxiang sun created HBASE-18247:

             Summary: Hbck to fix the case that replica region shows as key in the meta table
                 Key: HBASE-18247
                 URL: https://issues.apache.org/jira/browse/HBASE-18247
             Project: HBase
          Issue Type: Bug
    Affects Versions: 2.0.0-alpha-1
            Reporter: huaxiang sun
            Assignee: huaxiang sun
            Priority: Minor

Recently, we run into one case with read replica, the replica region shows up as key in meta
table (it is not supposed to happen, we are still working on why it showed up in the meta

However, hbck always reported the error about the primary region. Please see the error attached.

test,92b0201b,1492546349354_0001.c3e6f235fe7caef75f8b0fb92a012da3. column=info:regioninfo,
timestamp=1494958820573, value={ENCODED => c3e6f235fe7caef75f8b0fb92a012da3, NAME =>
'test,92b0201b,1492546349354_0001.c3e6f235fe7caef75f8b0fb92a012da3.', STARTKEY => '92b0201b',
ENDKEY => '92f1a952', REPLICA_ID => 1}

ERROR: Region { meta => test,92b0201b,1492546349354.d2c637715f31a072f174e70d407fb458.,
hdfs => null, deployed => , replicaId => 0 } found in META, but not in HDFS or deployed
on any region server.

Traced the code, in the following line, it does not consider the case that replicaId in regionInfo
could be non-default. 


If it is changed to get replicaId from regionInfo, then hbck should be able to fix this by

diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/MetaTableAccessor.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/MetaTableAccessor.java
index 9eb5111..1649e53 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/MetaTableAccessor.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/MetaTableAccessor.java
@@ -982,7 +982,7 @@ public class MetaTableAccessor {
     List<HRegionLocation> locations = new ArrayList<>(1);
     NavigableMap<byte[],NavigableMap<byte[],byte[]>> familyMap = r.getNoVersionMap();
-    locations.add(getRegionLocation(r, regionInfo, 0));
+    locations.add(getRegionLocation(r, regionInfo, regionInfo.getReplicaId()));
     NavigableMap<byte[], byte[]> infoMap = familyMap.get(getCatalogFamily());
     if (infoMap == null) return new RegionLocations(locations);

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