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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11921) Ozone: KSM: Unable to put keys with zero length
Date Fri, 02 Jun 2017 18:36:04 GMT
Anu Engineer created HDFS-11921:

             Summary: 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
            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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