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https://issues.apache.org/jira/browse/HBASE-19369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16307604#comment-16307604
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Duo Zhang commented on HBASE-19369:
-----------------------------------
{quote}
hflush() and hsync() on DFSStripedOutputStream are no-op. Thus calling hflush()
or hsync() on an erasure coded file can not guarantee data being persistent.
{quote}
This is enough to say that WAL can not use it. We need to make sure the data is
persistent, then we can return success to user.
> 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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