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https://issues.apache.org/jira/browse/ACCUMULO-2866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14020055#comment-14020055
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Josh Elser commented on ACCUMULO-2866:
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One nice thing about setting a very large block size on the WALs (which is
really like 1.05% of the configured value) is that when insufficient DFS space
exists, we fail quickly. Granted, it fails in a really obscure way (looks more
like a permission error iirc), but it still fails immediately instead of some
time later.
I'd be curious in some basic before/after numbers too. I am not knowledgeable
enough off the top of my head if something in the DFS pipeline would be
suffering by us doing this.
> Default WAL size should be based on HDFS Block Size
> ---------------------------------------------------
>
> Key: ACCUMULO-2866
> URL: https://issues.apache.org/jira/browse/ACCUMULO-2866
> Project: Accumulo
> Issue Type: Improvement
> Components: tserver
> Reporter: Mike Drob
> Priority: Minor
> Labels: wal
> Fix For: 1.7.0
>
>
> HBase automatically defaults their WAL size to 0.95 * HDFS block size. This
> makes a lot of sense from a resource management perspective, and we should do
> the same.
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