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https://issues.apache.org/jira/browse/HBASE-2087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796271#action_12796271
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stack commented on HBASE-2087:
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The problem this issue covers is case where a regionserver has say 1k regions
and it so happens that one of these is over the store file upper limit. As is
all flushing on the regionserver is held up because one region is over the
limit. Because no flushing we will block writes and so on
> The wait on compaction because "Too many store files" holds up all flushing
> ---------------------------------------------------------------------------
>
> Key: HBASE-2087
> URL: https://issues.apache.org/jira/browse/HBASE-2087
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: stack
>
> The method MemStoreFlusher#checkStoreFileCount is called from flushRegion.
> flushRegion is called by MemStoreFlusher#run thread. If the
> checkStoreFileCount finds too many store files, it'll stick around waiting on
> a compaction to happen. While its hanging, the MemStoreFlusher#run is held
> up. No other region can flush. Meantime WALs will be rolling and memory
> will be accumulating writes.
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