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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11886) Ozone : improve error handling for putkey operation
Date Tue, 30 May 2017 22:25:05 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11886?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Anu Engineer updated HDFS-11886:
    Attachment: design-notes-putkey.pdf

[~xyao], [~szetszwo], [~cheersyang] uploading a doc that captures the off-line discussion
that me and [~xyao] had. Please let me know if you have any questions. 

[~vagarychen] This is also useful when we have to support multi-stage keys -- That is keys
which are uploaded as independent transactions but appear as a single key. Both s3 and azure
supports that. 

> Ozone : improve error handling for putkey operation
> ---------------------------------------------------
>                 Key: HDFS-11886
>                 URL: https://issues.apache.org/jira/browse/HDFS-11886
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>            Reporter: Chen Liang
>         Attachments: design-notes-putkey.pdf
> Ozone's putKey operations involve a couple steps:
> 1. KSM calls allocateBlock to SCM, writes this info to KSM's local metastore
> 2. allocatedBlock gets returned to client, client checks to see if container needs to
be created on datanode, if yes, create the container
> 3. writes the data to container.
> it is possible that 1 succeeded, but 2 or 3 failed, in this case there will be an entry
in KSM's local metastore, but the key is actually nowhere to be found. We need to revert 1
is 2 or 3 failed in this case. 
> To resolve this, we need at least two things to be implemented first.
> 1. We need deleteKey() to be added KSM first. 
> 2. We also need container reports to be implemented first such that SCM can track whether
the container is actually added.

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