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https://issues.apache.org/jira/browse/ARROW-7495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17116386#comment-17116386
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Ji Liu commented on ARROW-7495:
-------------------------------
Issue resolved by pull request 6433
[https://github.com/apache/arrow/pull/6433|https://github.com/apache/arrow/pull/7211]
> [Java] Remove "empty" concept from ArrowBuf, replace with custom
> referencemanager
> ---------------------------------------------------------------------------------
>
> Key: ARROW-7495
> URL: https://issues.apache.org/jira/browse/ARROW-7495
> Project: Apache Arrow
> Issue Type: Task
> Components: Java
> Reporter: Jacques Nadeau
> Assignee: Ji Liu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 4h 20m
> Remaining Estimate: 0h
>
> With the introduction of ReferenceManager in the codebase, the need for a
> separate ArrowBuf is no longer necessary. Instead, once can create a new
> reference manager that is used for the empty ArrowBuf. For reminder/review,
> empty arrowbufs have a special behavior in that they don't actually have any
> reference counting semantics and always stay at one. This allow us to better
> troubleshoot unallocated memory than what would otherwise be an NPE after
> calling ValueVector.clear()
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