Wenwu Peng created HDFS-6316:
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Summary: Only one replica for each block in single-rack cluster
Key: HDFS-6316
URL: https://issues.apache.org/jira/browse/HDFS-6316
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 1.2.1
Reporter: Wenwu Peng
In HDFS 1,only one replica for each block when in single rack cluster when
enble nodegroup awareness. in my environment, there is single rack and four
nodegroup
even though the replication=3.
Steps:
1. setup a hadoop cluster with all pyhsical in same rack
2. Run hadoop fs -copyFromLocal /data /test
3. Run hadoop fsck /test -files -locations -blocks -racks
Topology:
192.168.0.1 /default-rack/nodegroup1
192.168.0.2 /default-rack/odegroup1
192.168.0.3 /default-rack/nodegroup1
192.168.0.4 /default-rack/nodegroup2
192.168.0.5 /default-rack/nodegroup2
192.168.0.6 /default-rack/nodegroup2
192.168.0.7 /default-rack/nodegroup3
192.168.0.8 /default-rack/nodegroup3
192.168.0.9 /default-rack/nodegroup4
192.168.0.19 /default-rack/nodegroup4
Namenode.log
2014-01-14 00:51:19,884 WARN
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Not able to place enough
replicas, still in need of 2 to reach 3
Not able to place enough replicas
Note:
1. Not exist in Hadoop 2.2.0
2. Not exist when have more than one rack
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