diff --git a/hbase-common/src/main/java/org/apache/hadoop/hbase/HConstants.java b/hbase-common/src/main/java/org/apache/hadoop/hbase/HConstants.java
index 664ec6f..dca85a0 100644
--- a/hbase-common/src/main/java/org/apache/hadoop/hbase/HConstants.java
+++ b/hbase-common/src/main/java/org/apache/hadoop/hbase/HConstants.java
@@ -794,7 +794,10 @@ public final class HConstants {
/** Conf key that enables unflushed WAL edits directly being replayed to region servers */
public static final String DISTRIBUTED_LOG_REPLAY_KEY = "hbase.master.distributed.log.replay";
- public static final boolean DEFAULT_DISTRIBUTED_LOG_REPLAY_CONFIG = false;
+ /**
+ * Default 'distributed log replay' as true since hbase 0.99.0
+ */
+ public static final boolean DEFAULT_DISTRIBUTED_LOG_REPLAY_CONFIG = true;
public static final String DISALLOW_WRITES_IN_RECOVERING =
"hbase.regionserver.disallow.writes.when.recovering";
public static final boolean DEFAULT_DISALLOW_WRITES_IN_RECOVERING_CONFIG = false;
diff --git a/hbase-common/src/main/resources/hbase-default.xml b/hbase-common/src/main/resources/hbase-default.xml
index 5be15e2..48166e3 100644
--- a/hbase-common/src/main/resources/hbase-default.xml
+++ b/hbase-common/src/main/resources/hbase-default.xml
@@ -220,6 +220,16 @@ possible configurations would overwhelm and obscure the important.
The HLog file writer implementation.
+ hbase.master.distributed.log.replay
+ true
+ Enable 'distributed log replay' as default engine splitting
+ WAL files on server crash. This default is new in hbase 1.0. To fall
+ back to the old mode 'distributed log splitter', set the value to
+ 'false'. 'Disributed log replay' improves MTTR because it does not
+ write intermediate files. 'DLR' required that 'hfile.format.version'
+ be set to version 3 or higher.
+
+
hbase.regionserver.global.memstore.size
0.4
Maximum size of all memstores in a region server before new
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogSplitter.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogSplitter.java
index d03a96c..a152c39 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogSplitter.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogSplitter.java
@@ -76,6 +76,7 @@ import org.apache.hadoop.hbase.client.Mutation;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.exceptions.RegionOpeningException;
import org.apache.hadoop.hbase.io.HeapSize;
+import org.apache.hadoop.hbase.io.hfile.HFile;
import org.apache.hadoop.hbase.master.SplitLogManager;
import org.apache.hadoop.hbase.monitoring.MonitoredTask;
import org.apache.hadoop.hbase.monitoring.TaskMonitor;
@@ -1972,7 +1973,13 @@ public class HLogSplitter {
* @return true when distributed log replay is turned on
*/
public static boolean isDistributedLogReplay(Configuration conf) {
- return conf.getBoolean(HConstants.DISTRIBUTED_LOG_REPLAY_KEY,
+ boolean dlr = conf.getBoolean(HConstants.DISTRIBUTED_LOG_REPLAY_KEY,
HConstants.DEFAULT_DISTRIBUTED_LOG_REPLAY_CONFIG);
+ int version = conf.getInt(HFile.FORMAT_VERSION_KEY, HFile.MAX_FORMAT_VERSION);
+ if (LOG.isTraceEnabled()) {
+ LOG.trace("Distributed log replay=" + dlr + ", " + HFile.FORMAT_VERSION_KEY + "=" + version);
+ }
+ // For distributed log replay, hfile version must be 3 at least; we need tag support.
+ return dlr && (version >= 3);
}
}