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https://issues.apache.org/jira/browse/HDDS-2375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16975861#comment-16975861
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Tsz-wo Sze commented on HDDS-2375:
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[~xyao], thanks a lot for reviewing and merging the pull-request.
> Refactor BlockOutputStream to allow flexible buffering
> ------------------------------------------------------
>
> Key: HDDS-2375
> URL: https://issues.apache.org/jira/browse/HDDS-2375
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Components: Ozone Client
> Reporter: Tsz-wo Sze
> Assignee: Tsz-wo Sze
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.5.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> In HDDS-2331, we found that Ozone client allocates a ByteBuffer with chunk
> size (e.g. 16MB ) to store data, unregarded the actual data size. The
> ByteBuffer will create a byte[] with chunk size. When the ByteBuffer is
> wrapped to a ByteString the byte[] remains in the ByteString.
> As a result, when the actual data size is small (e.g. 1MB), a lot of memory
> spaces (15MB) are wasted.
> In this JIRA, we refactor BlockOutputStream so that the buffering becomes
> more flexible. In a later JIRA (HDDS-2386), we implement chunk buffer using
> a list of smaller buffers which are allocated only if needed.
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