Brahma Reddy Battula created HDFS-9127:
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Summary: Re-replication for files with enough replicas in single
rack
Key: HDFS-9127
URL: https://issues.apache.org/jira/browse/HDFS-9127
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Brahma Reddy Battula
Assignee: Brahma Reddy Battula
Found while debugging testcases in HDFS-8647
*Scenario:*
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Start a cluster with Single rack with three DN's
write a file with RF=3
adde two Nodes with different racks
As per blockplacement policy ([Rack
Awareness|http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/RackAwareness.html])
atleast one replica needs to replicate to newly added rack.But it is not
happening..Because of following reason.
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when cluster was single rack,block will be removed from {{neededReplications}}
after 3 replicas.
later, after adding new rack, only replications will happen which are present
in {{neededReplications}}
So for the blocks which already have enough replicas, new rack replications
will not take place..
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