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https://issues.apache.org/jira/browse/HBASE-20727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16511939#comment-16511939
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Allan Yang commented on HBASE-20727:
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{quote}Since operator cannot take any action seeing the above, I think DEBUG
log would be better.
{quote}
modified in the new patch.
{quote}The above is added to expireServer(). If there're multiple servers
expiring around the same time, does the flush need to happen for every server ?
{quote}
No, Just trigger the chore here, only one will execute.
{quote}Does the chore need to start when the enable flag is false ?
{quote}
No, I will check in the startChore() method.
{quote}removeDeletedRegionFromLoadedFlushedSequenceIds iterates
flushedSequenceIdByRegion twice. It seems using iterator one traversal should
suffice.
{quote}
modified in the new patch.
Also modified according to checkstyle, thanks, [[email protected]]
> Persist FlushedSequenceId to speed up WAL split after cluster restart
> ---------------------------------------------------------------------
>
> Key: HBASE-20727
> URL: https://issues.apache.org/jira/browse/HBASE-20727
> Project: HBase
> Issue Type: New Feature
> Affects Versions: 2.0.0
> Reporter: Allan Yang
> Assignee: Allan Yang
> Priority: Major
> Fix For: 3.0.0
>
> Attachments: HBASE-20727.002.patch, HBASE-20727.patch
>
>
> We use flushedSequenceIdByRegion and storeFlushedSequenceIdsByRegion in
> ServerManager to record the latest flushed seqids of regions and stores. So
> during log split, we can use seqids stored in those maps to filter out the
> edits which do not need to be replayed. But, those maps are not persisted.
> After cluster restart or master restart, info of flushed seqids are all lost.
> Here I offer a way to persist those info to HDFS, even if master restart, we
> can still use those info to filter WAL edits and then to speed up replay.
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