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https://issues.apache.org/jira/browse/HDFS-8694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Lei (Eddy) Xu updated HDFS-8694:
--------------------------------
Attachment: HDFS-8694.000.patch
The # of IOerror is kept in {{FsVolumes}} and exposes it as
{{VolumeInfo}}:{{errors}} in {{JMX}}:
{code}
{
"name" : "Hadoop:service=DataNode,name=DataNodeInfo",
"modelerType" : "org.apache.hadoop.hdfs.server.datanode.DataNode",
"XceiverCount" : 1,
"DatanodeNetworkCounts" : [ ],
"Version" : "3.0.0-SNAPSHOT",
"RpcPort" : "50002",
"HttpPort" : null,
"NamenodeAddresses" :
"{\"localhost\":\"BP-1143576736-127.0.0.1-1435617411301\"}",
"VolumeInfo" :
"{\"/foo/hadoop/test/data/dn0/vol0/current\":{\"freeSpace\":100856463360,\"errors\":0,\"usedSpace\":8192,\"reservedSpaceForRBW\":0,\"reservedSpace\":0},\"/foo/hadoop/test/data/dn0/vol1/current\":{\"freeSpace\":100856463360,\"errors\":0,\"usedSpace\":8192,\"reservedSpaceForRBW\":0,\"reservedSpace\":0}}",
"ClusterId" : "CID-022d733d-9061-4f14-a990-8a93316ca57d"
},
{code}
> Expose the stats of IOErrors on each FsVolume through JMX
> ---------------------------------------------------------
>
> Key: HDFS-8694
> URL: https://issues.apache.org/jira/browse/HDFS-8694
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode, HDFS
> Affects Versions: 2.7.0
> Reporter: Lei (Eddy) Xu
> Assignee: Lei (Eddy) Xu
> Attachments: HDFS-8694.000.patch
>
>
> Currently, once DataNode hits an {{IOError}} when writing / reading block
> files, it starts a background {{DiskChecker.checkDirs()}} thread. But if this
> thread successfully finishes, DN does not record this {{IOError}}.
> We need one measurement to count all {{IOErrors}} for each volume.
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