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https://issues.apache.org/jira/browse/HDDS-2375?focusedWorklogId=344617&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-344617
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ASF GitHub Bot logged work on HDDS-2375:
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Author: ASF GitHub Bot
Created on: 15/Nov/19 22:19
Start Date: 15/Nov/19 22:19
Worklog Time Spent: 10m
Work Description: xiaoyuyao commented on pull request #97: HDDS-2375.
Refactor BlockOutputStream to allow flexible buffering.
URL: https://github.com/apache/hadoop-ozone/pull/97
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Issue Time Tracking
-------------------
Worklog Id: (was: 344617)
Time Spent: 20m (was: 10m)
> 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
> 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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