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https://issues.apache.org/jira/browse/HDDS-271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16558327#comment-16558327
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Nanda kumar commented on HDDS-271:
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As this is an iterator we can throw NoSuchElementException if the iteration has
no more element instead of returning null.
If {{hasNext}} returns true we should be able to return the next block on
{{nextBlock}} call.
Consider a case where we have two blocks [key1:block1, #deleting#key2:block2].
For the first {{hasNext}} call we will return {{true}} and the {{nextBlock}}
call will return key1:block1. For the second {{hasNext}} call we will return
{{true}} but the {{nextBlock}} call will return {{null}}. This will create
inconsistent behavior in code wherever the iterator is used. We cannot fully
rely on {{hasNext}} call anymore.
> Create a block iterator to iterate blocks in a container
> --------------------------------------------------------
>
> Key: HDDS-271
> URL: https://issues.apache.org/jira/browse/HDDS-271
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Reporter: Bharat Viswanadham
> Assignee: Bharat Viswanadham
> Priority: Major
> Fix For: 0.2.1
>
> Attachments: HDDS-271.00.patch, HDDS-271.01.patch, HDDS-271.02.patch,
> HDDS-271.03.patch
>
>
> Create a block iterator to scan all blocks in a container.
> This one will be useful during implementation of container scanner.
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