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https://issues.apache.org/jira/browse/HBASE-10201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14243631#comment-14243631
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Jeffrey Zhong commented on HBASE-10201:
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[[email protected]] Besides [~Apache9] mentioned, we skip edits using seqId
of each relating store, the #4(which is > #3) is only set after region is full
recovered(i.e all WAL edits are already replayed).
{quote}
If master crash and loss the information, then we will not skip any edits?
{quote}
yes, we'll lose the info and will replay more edits.
> Port 'Make flush decisions per column family' to trunk
> ------------------------------------------------------
>
> Key: HBASE-10201
> URL: https://issues.apache.org/jira/browse/HBASE-10201
> Project: HBase
> Issue Type: Improvement
> Components: wal
> Reporter: Ted Yu
> Assignee: zhangduo
> Fix For: 1.0.0, 2.0.0
>
> Attachments: 3149-trunk-v1.txt, HBASE-10201-0.98.patch,
> HBASE-10201-0.98_1.patch, HBASE-10201-0.98_2.patch, HBASE-10201-0.99.patch,
> HBASE-10201.patch, HBASE-10201_1.patch, HBASE-10201_10.patch,
> HBASE-10201_11.patch, HBASE-10201_12.patch, HBASE-10201_13.patch,
> HBASE-10201_13.patch, HBASE-10201_14.patch, HBASE-10201_15.patch,
> HBASE-10201_16.patch, HBASE-10201_17.patch, HBASE-10201_18.patch,
> HBASE-10201_2.patch, HBASE-10201_3.patch, HBASE-10201_4.patch,
> HBASE-10201_5.patch, HBASE-10201_6.patch, HBASE-10201_7.patch,
> HBASE-10201_8.patch, HBASE-10201_9.patch, compactions.png, count.png, io.png,
> memstore.png
>
>
> Currently the flush decision is made using the aggregate size of all column
> families. When large and small column families co-exist, this causes many
> small flushes of the smaller CF. We need to make per-CF flush decisions.
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