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https://issues.apache.org/jira/browse/HBASE-19083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16321920#comment-16321920
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Duo Zhang commented on HBASE-19083:
-----------------------------------
Your question #1 is the answer to question #2. I want to make sure in the
compile time that you must have at least one writer instance, so that for #2,
your will never use the null to complete the future since the length can only
be null when you call sync the first time and the index is 0 but the length is
at least 1.
> Introduce a new log writer which can write to two HDFSes
> --------------------------------------------------------
>
> Key: HBASE-19083
> URL: https://issues.apache.org/jira/browse/HBASE-19083
> Project: HBase
> Issue Type: Sub-task
> Components: Replication, wal
> Reporter: Duo Zhang
> Assignee: Duo Zhang
> Labels: HBASE-19064
> Fix For: HBASE-19064
>
> Attachments: HBASE-19083.patch
>
>
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