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https://issues.apache.org/jira/browse/HDFS-11956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16060089#comment-16060089
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Ewan Higgs commented on HDFS-11956:
-----------------------------------
Hi Andrew
{quote}
IIUC, we know the storage type even for an old client since it passes it in the
writeBlock request. Can an old client correctly pass along an unknown
StorageType (e.g. PROVIDED)?
{quote}
I think you understood correctly. I don't think an old client will be able to
deserialise a PROVIDED StorageType from the protobuf, so it will fail to pass
along that StorageType (though I have not yet done the cross-version testing
with Hadoop 2.6). I think this is the same as would be the case any time a new
StorageType is introduced (e.g. if we hypothetically added
{{StorageType.NVME}}, {{StorageType.SMR}}, etc.). Maybe the forward
compatibility of StorageTypes is another JIRA I should raise?
{quote}
If so, then I see how this works; essentially, only require storageIDs when
writing to provided storage.
{quote}
Yes.
{quote}
For 3.0.0-alpha4 I can also revert HDFS-9807 while we figure out this JIRA. We
did this internally to unblock testing.
{quote}
I'm traveling today so I won't be able to furnish a patch just yet. What's your
time frame for tagging alpha4?
> Fix BlockToken compatibility with Hadoop 2.x clients
> ----------------------------------------------------
>
> Key: HDFS-11956
> URL: https://issues.apache.org/jira/browse/HDFS-11956
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.0.0-alpha4
> Reporter: Andrew Wang
> Assignee: Ewan Higgs
> Priority: Blocker
> Attachments: HDFS-11956.001.patch, HDFS-11956.002.patch,
> HDFS-11956.003.patch
>
>
> Seems like HDFS-9807 broke backwards compatibility with Hadoop 2.x clients.
> When talking to a 3.0.0-alpha4 DN with security on:
> {noformat}
> 2017-06-06 23:27:22,568 WARN org.apache.hadoop.hdfs.server.datanode.DataNode:
> Block token verification failed: op=WRITE_BLOCK,
> remoteAddress=/172.28.208.200:53900, message=Block token with StorageIDs
> [DS-c0f24154-a39b-4941-93cd-5b8323067ba2] not valid for access with
> StorageIDs []
> {noformat}
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