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https://issues.apache.org/jira/browse/HBASE-6980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13476543#comment-13476543
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Ted Yu commented on HBASE-6980:
-------------------------------
Here is javadoc for cacheFlushLock:
{code}
// This lock prevents starting a log roll during a cache flush.
// synchronized is insufficient because a cache flush spans two method calls.
private final ReentrantReadWriteLock cacheFlushLock = new
ReentrantReadWriteLock();
{code}
> Parallel Flushing Of Memstores
> ------------------------------
>
> Key: HBASE-6980
> URL: https://issues.apache.org/jira/browse/HBASE-6980
> Project: HBase
> Issue Type: New Feature
> Reporter: Kannan Muthukkaruppan
> Assignee: Kannan Muthukkaruppan
>
> For write dominated workloads, single threaded memstore flushing is an
> unnecessary bottleneck. With a single flusher thread, we are basically not
> setup to take advantage of the aggregate throughput that multi-disk nodes
> provide.
> * For puts with WAL enabled, the bottleneck is more likely the "single" WAL
> per region server. So this particular fix may not buy as much unless we
> unlock that bottleneck with multiple commit logs per region server. (Topic
> for a separate JIRA-- HBASE-6981).
> * But for puts with WAL disabled (e.g., when using HBASE-5783 style fast bulk
> imports), we should be able to support much better ingest rates with parallel
> flushing of memstores.
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