Index: src/docbkx/performance.xml
===================================================================
--- src/docbkx/performance.xml (revision 1146162)
+++ src/docbkx/performance.xml (working copy)
@@ -199,7 +199,21 @@
}
-
+
+
+ Table Creation: Deferred Log Flush
+
+
+The default behavior for Puts using the Write Ahead Log (WAL) is that HLog edits will be written immediately. If deferred log flush is used,
+WAL edits are kept in memory until the flush period. The benefit is aggregated and asynchronous HLog- writes, but the potential downside is that if
+ the RegionServer goes down the yet-to-be-flushed edits are lost. This is safer, however, than not using WAL at all with Puts.
+
+
+Deferred log flush can be configured on tables via HTableDescriptor. The default value of hbase.regionserver.optionallogflushinterval is 1000ms.
+
+
+
HBase Client