Yang Yun created HDFS-15039:
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Summary: Cache meta file length of FinalizedReplica to reduce call
File.length()
Key: HDFS-15039
URL: https://issues.apache.org/jira/browse/HDFS-15039
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode
Reporter: Yang Yun
Assignee: Yang Yun
When use ReplicaCachingGetSpaceUsed to get the volume space used. It will call
File.length() for every meta file of replica. That add more disk IO, we found
the slow log as below. For finalized replica, the size of meta file is not
changed, i think we can cache the value.
{code:java}
org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.ReplicaCachingGetSpaceUsed:
Refresh dfs used, bpid: BP-898717543-10.75.1.240-1519386995727 replicas size:
1166 dfsUsed: 72227113183 on volume: DS-3add8d62-d69a-4f5a-a29f-b7bbb400af2e
duration: 17206ms{code}
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