Eric Sirianni created HDFS-5484:
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Summary: StorageType and State in DatanodeStorageInfo in NameNode
is not accurate
Key: HDFS-5484
URL: https://issues.apache.org/jira/browse/HDFS-5484
Project: Hadoop HDFS
Issue Type: Bug
Components: datanode
Affects Versions: Heterogeneous Storage (HDFS-2832)
Reporter: Eric Sirianni
The fields in DatanodeStorageInfo are updated from two distinct paths:
# block reports
# storage reports (via heartbeats)
The {{state}} and {{storageType}} fields are updated via the Block Report.
However, as seen in the code blow, these fields are populated from a "dummy"
{{DatanodeStorage}} object constructed in the DataNode:
{code}
BPServiceActor.blockReport() {
//...
// Dummy DatanodeStorage object just for sending the block report.
DatanodeStorage dnStorage = new DatanodeStorage(storageID);
//...
}
{code}
The net effect is that the {{state}} and {{storageType}} fields are always the
default of {{NORMAL}} and {{DISK}} in the NameNode.
The recommended fix is to change {{FsDatasetSpi.getBlockReports()}} from:
{code}
public Map<String, BlockListAsLongs> getBlockReports(String bpid);
{code}
to:
{code}
public Map<DatanodeStorage, BlockListAsLongs> getBlockReports(String bpid);
{code}
thereby allowing {{BPServiceActor}} to send the "real" {{DatanodeStorage}}
object with the block report.
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