Add a block counter to DatanodeDescriptor
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Key: HDFS-1368
URL: https://issues.apache.org/jira/browse/HDFS-1368
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.22.0
Many of time, we need to count the total number of blocks in a datanode by
calling DatanodeDescriptor#numBlocks(). It has to traverse the block list to
get the counter, which may not be trivial if there are millions of blocks.
Adding a counter for each datanode does not cost much space but help save CPU
processing time.
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