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https://issues.apache.org/jira/browse/HDFS-5667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13850914#comment-13850914
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Arpit Agarwal commented on HDFS-5667:
-------------------------------------
Eric, are you looking at this? I'll pick it up otherwise.
> StorageType and State in DatanodeStorageInfo in NameNode is not accurate
> ------------------------------------------------------------------------
>
> Key: HDFS-5667
> URL: https://issues.apache.org/jira/browse/HDFS-5667
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Affects Versions: Heterogeneous Storage (HDFS-2832)
> Reporter: Eric Sirianni
> Fix For: Heterogeneous Storage (HDFS-2832)
>
>
> The fix for HDFS-5484 was accidentally regressed by the following change made
> via HDFS-5542
> {code}
> + DatanodeStorageInfo updateStorage(DatanodeStorage s) {
> synchronized (storageMap) {
> DatanodeStorageInfo storage = storageMap.get(s.getStorageID());
> if (storage == null) {
> @@ -670,8 +658,6 @@
> " for DN " + getXferAddr());
> storage = new DatanodeStorageInfo(this, s);
> storageMap.put(s.getStorageID(), storage);
> - } else {
> - storage.setState(s.getState());
> }
> return storage;
> }
> {code}
> By removing the 'else' and no longer updating the state in the BlockReport
> processing path, we effectively get the bogus state & type that is set via
> the first heartbeat (see the fix for HDFS-5455):
> {code}
> + if (storage == null) {
> + // This is seen during cluster initialization when the heartbeat
> + // is received before the initial block reports from each storage.
> + storage = updateStorage(new DatanodeStorage(report.getStorageID()));
> {code}
> Even reverting the change and reintroducing the 'else' leaves the state &
> type temporarily inaccurate until the first block report.
> As discussed with [~arpitagarwal], a better fix would be to simply include
> the full {{DatanodeStorage}} object in the {{StorageReport}} (as opposed to
> only the Storage ID). This requires adding the {{DatanodeStorage}} object to
> {{StorageReportProto}}. It needs to be a new optional field and we cannot
> remove the existing {{StorageUuid}} for protocol compatibility.
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