Xiping Zhang created HDFS-17915:
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Summary: Changes to the DN rack configuration on the NameNode do
not take effect immediately.
Key: HDFS-17915
URL: https://issues.apache.org/jira/browse/HDFS-17915
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Xiping Zhang
After adding a batch of DataNodes, we found that their rack information was
incorrect and needed to be updated. However, the updated rack configuration did
not take effect immediately after the DataNodes were restarted. Analysis showed
that the NameNode was still caching the previous rack information, and the
issue could only be resolved by restarting the NameNode.
Restarting the NameNode is a costly operation, especially in very large
clusters.
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