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https://issues.apache.org/jira/browse/HBASE-12733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15213560#comment-15213560
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mac champion commented on HBASE-12733:
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I couldn't find this log statement or any relevant TODOs in FSHLog. Maybe this
has been refactored away already?
Can this be closed, or am I mistaken?
> High volume of "Couldn't find oldest seqNum" warnings if bypassing WAL
> ----------------------------------------------------------------------
>
> Key: HBASE-12733
> URL: https://issues.apache.org/jira/browse/HBASE-12733
> Project: HBase
> Issue Type: Bug
> Reporter: Andrew Purtell
> Priority: Minor
> Labels: beginner
>
> When ingesting with the WAL bypassed, the RegionServer will log the following
> at every flush:
> {noformat}
> 2014-12-19 16:58:24,630 WARN [MemStoreFlusher.0] wal.FSHLog: Couldn't find
> oldest seqNum for the region we are about to flush:
> [86fc8c1374ebc29cc4a39a78966d48e0]
> {noformat}
> The WAL won't find a seqnum for the region until the first edit which does
> not bypass the WAL. That might not be for hundreds or thousands of flushes.
> This shouldn't be at WARN level since ingest with WAL bypass is legal if a
> bit unusual. It's concerning that the FSHLog code that emits that warning has
> a TODO above suggesting the warning should instead be an assertion.
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