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https://issues.apache.org/jira/browse/HBASE-3514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999029#comment-12999029
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Ted Yu commented on HBASE-3514:
-------------------------------
Since the buffer managed by ByteArrayOutputStream can grow, we don't need to
allocate a huge buffer in its ctor.
We can bound the buffer size by a constant:
{code}
long sz = blocksize;
sz += (blocksize / 4);
if (sz > 140000000) sz = 140000000;
this.baos = new ByteArrayOutputStream((int)sz);
{code}
TestMultipleTimestamps passes with the above change in patch.
> 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-0.90.patch, 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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