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https://issues.apache.org/jira/browse/HBASE-3514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12992091#comment-12992091
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Matteo Bertozzi commented on HBASE-3514:
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@stack The first patch that I've written hasn't the preallocated
ByteArrayOutputStream and has similar performance if block is small (64k). The
speedup comes from writing in memory and flushing everything to the
OutputStream on finishBlock().
> Speedup HFile.Writer append
> ---------------------------
>
> Key: HBASE-3514
> URL: https://issues.apache.org/jira/browse/HBASE-3514
> Project: HBase
> Issue Type: Improvement
> Components: io
> Affects Versions: 0.90.0
> Reporter: Matteo Bertozzi
> Priority: Minor
> Attachments: HBASE-3514-append.patch,
> HBASE-3514-metaBlock-bsearch.patch
>
>
> Remove double writes when block cache is specified, by using, only, the
> ByteArrayDataStream.
> baos is flushed with the compress stream on finishBlock.
> On my machines HFilePerformanceEvaluation SequentialWriteBenchmark passes
> from 4000ms to 2500ms.
> Running SequentialWriteBenchmark for 1000000 rows took 4247ms.
> Running SequentialWriteBenchmark for 1000000 rows took 4512ms.
> Running SequentialWriteBenchmark for 1000000 rows took 4498ms.
> Running SequentialWriteBenchmark for 1000000 rows took 2697ms.
> Running SequentialWriteBenchmark for 1000000 rows took 2770ms.
> Running SequentialWriteBenchmark for 1000000 rows took 2721ms.
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