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Posted to issues@hbase.apache.org by "chenxu (JIRA)" <ji...@apache.org> on 2019/08/07 07:37:00 UTC
[jira] [Assigned] (HBASE-22802) Avoid temp ByteBuffer allocation in
FileIOEngine#read
[ https://issues.apache.org/jira/browse/HBASE-22802?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
chenxu reassigned HBASE-22802:
------------------------------
Assignee: chenxu
> Avoid temp ByteBuffer allocation in FileIOEngine#read
> -----------------------------------------------------
>
> Key: HBASE-22802
> URL: https://issues.apache.org/jira/browse/HBASE-22802
> Project: HBase
> Issue Type: Improvement
> Components: BucketCache
> Reporter: chenxu
> Assignee: chenxu
> Priority: Major
> Attachments: profile_mem_alloc.png
>
>
> a temp ByteBuffer was allocated each time FileIOEngine#read was called
> {code:java}
> public Cacheable read(BucketEntry be) throws IOException {
> long offset = be.offset();
> int length = be.getLength();
> Preconditions.checkArgument(length >= 0, "Length of read can not be less than 0.");
> ByteBuffer dstBuffer = ByteBuffer.allocate(length);
> ...
> }
> {code}
> we can avoid this by use of ByteBuffAllocator#allocate(length) after HBASE-21879
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