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https://issues.apache.org/jira/browse/HBASE-14735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15158469#comment-15158469
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Shuaifeng Zhou commented on HBASE-14735:
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In our clusters fixed like this, and this problem never happened again during
the passed few monthes.
> Region may grow too big and can not be split
> --------------------------------------------
>
> Key: HBASE-14735
> URL: https://issues.apache.org/jira/browse/HBASE-14735
> Project: HBase
> Issue Type: Bug
> Components: Compaction, regionserver
> Affects Versions: 1.1.2, 0.98.15
> Reporter: Shuaifeng Zhou
> Assignee: Shuaifeng Zhou
> Attachments: 14735-0.98.patch, 14735-branch-1.1.patch,
> 14735-branch-1.2.patch, 14735-branch-1.2.patch, 14735-master (2).patch,
> 14735-master.patch, 14735-master.patch
>
>
> When a compaction completed, may there are also many storefiles in the store,
> and CompactPriority < 0, then compactSplitThread will do a "Recursive
> enqueue" compaction request instead of request a split:
> {code:title=CompactSplitThread.java|borderStyle=solid}
> if (completed) {
> // degenerate case: blocked regions require recursive enqueues
> if (store.getCompactPriority() <= 0) {
> requestSystemCompaction(region, store, "Recursive enqueue");
> } else {
> // see if the compaction has caused us to exceed max region size
> requestSplit(region);
> }
> {code}
> But in some situation, the "recursive enqueue" request may return null, and
> not build up a new compaction runner. For example, an other compaction of the
> same region is running, and compaction selection will exclude all files older
> than the newest files currently compacting, this may cause no enough files
> can be selected by the "recursive enqueue" request. When this happen, split
> will not be trigged. If the input load is high enough, compactions aways
> running on the region, and split will never be triggered.
> In our cluster, this situation happened, and a huge region more than 400GB
> and 100+ storefiles appeared. Version is 0.98.10, and the trank also have the
> problem.
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