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https://issues.apache.org/jira/browse/HBASE-19369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16307588#comment-16307588
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Duo Zhang commented on HBASE-19369:
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{quote}
EC doesn't support hsync or hflush.
{quote}
Does this means EC will write data directly to DN even if you do not call hsync
or hflush? I guess not...
I think the implementation is that we will buffer data locally and then
calculate the EC block when full, and then write different block to different
DNs. Then it can not be used by WAL...
> HBase Should use Builder Pattern to Create Log Files while using WAL on
> Erasure Coding
> --------------------------------------------------------------------------------------
>
> Key: HBASE-19369
> URL: https://issues.apache.org/jira/browse/HBASE-19369
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: Alex Leblang
> Assignee: Alex Leblang
> Attachments: HBASE-19369.master.001.patch,
> HBASE-19369.master.002.patch, HBASE-19369.master.003.patch,
> HBASE-19369.master.004.patch, HBASE-19369.v5.patch, HBASE-19369.v6.patch,
> HBASE-19369.v7.patch, HBASE-19369.v8.patch
>
>
> Right now an HBase instance using the WAL won't function properly in an
> Erasure Coded environment. We should change the following line to use the
> hdfs.DistributedFileSystem builder pattern
> https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/ProtobufLogWriter.java#L92
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