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https://issues.apache.org/jira/browse/HBASE-12213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14623363#comment-14623363
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ramkrishna.s.vasudevan commented on HBASE-12213:
------------------------------------------------
JMH result to indicate the benefit we get for doing ByteBuffer.get(index) with
and without Unsafe usage.
{code}
Benchmark Mode Cnt Score
Error Units
ByteBufferOperations.getFromDBB thrpt 5 553436792.275 ±
2439422.938 ops/s
ByteBufferOperations.getFromHBB thrpt 5 350390020.038 ±
7289682.918 ops/s
ByteBufferOperations.getUsingBbUtilsFromDBB thrpt 5 822765318.322 ±
31032738.527 ops/s
ByteBufferOperations.getUsingBbUtilsFromHBB thrpt 5 551660820.090 ±
13224452.563 ops/s
{code}
> HFileBlock backed by Array of ByteBuffers
> -----------------------------------------
>
> Key: HBASE-12213
> URL: https://issues.apache.org/jira/browse/HBASE-12213
> Project: HBase
> Issue Type: Sub-task
> Components: regionserver, Scanners
> Reporter: Anoop Sam John
> Assignee: ramkrishna.s.vasudevan
> Attachments: HBASE-12213_1.patch, HBASE-12213_10_withBBI.patch,
> HBASE-12213_2.patch, HBASE-12213_4.patch, HBASE-12213_8_withBBI.patch,
> HBASE-12213_9_withBBI.patch, HBASE-12213_jmh.zip
>
>
> In L2 cache (offheap) an HFile block might have been cached into multiple
> chunks of buffers. If HFileBlock need single BB, we will end up in recreation
> of bigger BB and copying. Instead we can make HFileBlock to serve data from
> an array of BBs.
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