Reduce NN startup time by reducing the processing time of block reports
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Key: HDFS-1147
URL: https://issues.apache.org/jira/browse/HDFS-1147
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Reporter: dhruba borthakur
The NameNode restart times are impacted to a large extent by the processing
time of block reports. For a cluster with 150 millions blocks, the block report
processing in the NN can take upto 20 minutes or so. The NN is open for
business only after it has processed the block reports from most of the
datanodes. If we can reduce the processing time of a block report, that will
directly reduce the restart time of the NN.
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