[
https://issues.apache.org/jira/browse/HBASE-3514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12992252#comment-12992252
]
ryan rawson commented on HBASE-3514:
------------------------------------
the hfile writer append code does:
private void checkBlockBoundary() throws IOException {
if (this.out != null && this.out.size() < blocksize) return;
finishBlock();
newBlock();
If we did stopped at the first key > than a block we'd also have to
check that there is at least 1 KV, otherwise we'd end up stuck :-)
Perhaps it might be beneficial to undersize the blocks to the first KV
< than block size, rather than the first KV > block size?
> 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.
--
This message is automatically generated by JIRA.
-
For more information on JIRA, see: http://www.atlassian.com/software/jira
