Vladimir Rodionov created HBASE-13883:
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Summary: Fix Memstore Flush section in HBase book
Key: HBASE-13883
URL: https://issues.apache.org/jira/browse/HBASE-13883
Project: HBase
Issue Type: Bug
Components: documentation
Reporter: Vladimir Rodionov
{quote}
65.7.2. MemStore Flush
A MemStore flush can be triggered under any of the conditions listed below. The
minimum flush unit is per region, not at individual MemStore level.
1. When a MemStore reaches the size specified by
hbase.hregion.memstore.flush.size, all MemStores that belong to its region will
be flushed out to disk.
2. When the overall MemStore usage reaches the value specified by
hbase.regionserver.global.memstore.upperLimit, MemStores from various regions
will be flushed out to disk to reduce overall MemStore usage in a RegionServer.
The flush order is based on the descending order of a region’s MemStore usage.
Regions will have their MemStores flushed until the overall MemStore usage
drops to or slightly below hbase.regionserver.global.memstore.lowerLimit.
3. When the number of WAL per region server reaches the value specified in
hbase.regionserver.max.logs, MemStores from various regions will be flushed out
to disk to reduce WAL count. The flush order is based on time. Regions with the
oldest MemStores are flushed first until WAL count drops below
hbase.regionserver.max.logs.
{quote}
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