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Andrew Wang commented on HDFS-7331: ----------------------------------- Instead of a Map<String, Long>, couldn't we just use an object? Fairly sure Jackson can do the POJO->JSON conversion automatically. If there are also plans to put other network stats into this structure, we should consider some more fine-grained synchronization. Stat updates were a major slowdown in the FileSystem client until Colin fixed it. If it's just for error cases, this isn't necessary. > Add Datanode network counts to datanode jmx page > ------------------------------------------------ > > Key: HDFS-7331 > URL: https://issues.apache.org/jira/browse/HDFS-7331 > Project: Hadoop HDFS > Issue Type: Improvement > Components: datanode > Reporter: Charles Lamb > Assignee: Charles Lamb > Priority: Minor > Attachments: HDFS-7331.001.patch > > > Add per-datanode counts to the datanode jmx page. For example, networkErrors > could be exposed like this: > {noformat} > }, { > ... > "DatanodeNetworkCounts" : "{\"dn1\":{\"networkErrors\":1}}", > ... > "NamenodeAddresses" : > "{\"localhost\":\"BP-1103235125-127.0.0.1-1415057084497\"}", > "VolumeInfo" : > "{\"/tmp/hadoop-cwl/dfs/data/current\":{\"freeSpace\":3092725760,\"usedSpace\":28672,\"reservedSpace\":0}}", > "ClusterId" : "CID-4b38f2ae-5e58-4e15-b3cf-3ba3f46e724e" > }, { > {noformat} -- This message was sent by Atlassian JIRA (v6.3.4#6332)