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https://issues.apache.org/jira/browse/HDFS-11921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16039377#comment-16039377
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Chen Liang commented on HDFS-11921:
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Yes, I already changed that part in HDFS-11920 :)
> Ozone: KSM: Unable to put keys with zero length
> -----------------------------------------------
>
> Key: HDFS-11921
> URL: https://issues.apache.org/jira/browse/HDFS-11921
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
> Affects Versions: HDFS-7240
> Reporter: Anu Engineer
> Assignee: Anu Engineer
> Priority: Minor
>
> As part of working on HDFS-11909, I was trying to put zero length keys. I
> found that put key refuses to do that. Here is the call trace,
> bq. at ScmBlockLocationProtocolClientSideTranslatorPB.allocateBlock
> we check if the block size is greater than 0, which makes sense since we
> should not call into SCM to allocate a block of zero size.
> However these 2 calls are invoked for creating the key, so that metadata for
> key can be created, we should probably take care of this behavior here.
> bq. ksm.KeyManagerImpl.allocateKey
> bq. ksm.KeySpaceManager.allocateKey(KeySpaceManager.java:428)
> Another way to fix this might be to just allocate a block with at least 1
> byte always, which might be easier than special casing code.
> [~vagarychen] Would you like to fix this in the next patch you are working on
> ?
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