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https://issues.apache.org/jira/browse/HBASE-22802?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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chenxu updated HBASE-22802:
---------------------------
Release Note: HBASE-21879 introduces a utility class
(org.apache.hadoop.hbase.io.ByteBuffAllocator) used for allocating/freeing
ByteBuffers from/to NIO ByteBuffer pool, when BucketCache enabled with file or
mmap engine, we will use this ByteBuffer pool to avoid temp ByteBuffer
allocation a lot.
> 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
> Fix For: 3.0.0, 2.3.0
>
> Attachments: HBASE-22802-master-v1.patch, profile_mem_alloc.png,
> profile_mem_alloc_with_pool.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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