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https://issues.apache.org/jira/browse/HDFS-4988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13778521#comment-13778521
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Junping Du commented on HDFS-4988:
----------------------------------
Hi Arpit, as I just mentioned, the following new added code in
setFieldsFromProperties() in DataStorage.java are actually removing
verification of storageID (now is DatanodeUUID) that from VERSION file. Do we
think this is unnecessary now?
{code}
+ // Update the datanode UUID if present.
+ if (props.getProperty("datanodeUuid") != null) {
+ String dnUuid = props.getProperty("datanodeUuid");
+ setDatanodeUuid(dnUuid);
+
+ if (getDatanodeUuid() != null &&
+ getDatanodeUuid().compareTo(dnUuid) != 0) {
+ throw new InconsistentFSStateException(sd.getRoot(),
+ "Root " + sd.getRoot() + ": DatanodeUuid=" + dnUuid +
+ ", does not match " + datanodeUuid + " from other" +
+ " StorageDirectory.");
+ }
{code}
> Datanode must support all the volumes as individual storages
> ------------------------------------------------------------
>
> Key: HDFS-4988
> URL: https://issues.apache.org/jira/browse/HDFS-4988
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Reporter: Suresh Srinivas
> Assignee: Arpit Agarwal
> Attachments: HDFS-4988.01.patch, HDFS-4988.02.patch,
> HDFS-4988.05.patch, HDFS-4988.06.patch, HDFS-4988.07.patch, HDFS-4988.08.patch
>
>
> Currently all the volumes on datanode is reported as a single storage. This
> change proposes reporting them as individual storage. This requires:
> # A unique storage ID for each storage
> #* This needs to be generated during formatting
> # There should be an option to allow existing disks to be reported as single
> storage unit for backward compatibility.
> # A functionality is also needed to split the existing all volumes as single
> storage unit to to individual storage units.
> # -Configuration must allow for each storage unit a storage type attribute.
> (Now HDFS-5000)-
> # Block reports must be sent on a per storage basis. In some cases (such
> memory tier) block reports may need to be sent more frequently. That means
> block reporting period must be on a per storage type basis.
> My proposal is for new clusters to configure volumes by default as separate
> storage unit. Lets discuss.
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