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https://issues.apache.org/jira/browse/HBASE-17172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15711517#comment-15711517
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Jingcheng Du commented on HBASE-17172:
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Thanks [~huaxiang].
If we skip the compacted files, the threshold is not that useful anymore. I
have three options for the solution.
One is to decrease the threshold, and use the compaction policy in HBASE-16981
in the compaction.
The second one is we can skip the minor compaction if there is only one mob
file (or two mob files) and one _del file. But we have to suffer the
unnecessary compaction in major compaction ( although the major compaction is
not recommended).
The last one is we group the _del files by regions, but this is very difficult
to allign the keys in _del files and the partitions in mob files.
> Optimize major mob compaction with _del files
> ---------------------------------------------
>
> Key: HBASE-17172
> URL: https://issues.apache.org/jira/browse/HBASE-17172
> Project: HBase
> Issue Type: Improvement
> Components: mob
> Affects Versions: 2.0.0
> Reporter: huaxiang sun
> Assignee: huaxiang sun
>
> Today, when there is a _del file in mobdir, with major mob compaction, every
> mob file will be recompacted, this causes lots of IO and slow down major mob
> compaction (may take months to finish). This needs to be improved. A few
> ideas are:
> 1) Do not compact all _del files into one, instead, compact them based on
> groups with startKey as the key. Then use firstKey/startKey to make each mob
> file to see if the _del file needs to be included for this partition.
> 2). Based on the timerange of the _del file, compaction for files after that
> timerange does not need to include the _del file as these are newer files.
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