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HDFS-17580. Change the default value of dfs.datanode.lock.fair to false due to potential hang #6943

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HDFS-17580. Change the default value of dfs.datanode.lock.fair to false due to potential hang #6943

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2 changes: 1 addition & 1 deletion hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
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Original file line number Diff line number Diff line change
Expand Up @@ -669,7 +669,7 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
10000; //ms
public static final String DFS_DATANODE_LOCK_FAIR_KEY =
"dfs.datanode.lock.fair";
public static final boolean DFS_DATANODE_LOCK_FAIR_DEFAULT = true;
public static final boolean DFS_DATANODE_LOCK_FAIR_DEFAULT = false;

public static final String DFS_UPGRADE_DOMAIN_FACTOR = "dfs.namenode.upgrade.domain.factor";
public static final int DFS_UPGRADE_DOMAIN_FACTOR_DEFAULT = DFS_REPLICATION_DEFAULT;
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2 changes: 1 addition & 1 deletion hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
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Expand Up @@ -3540,7 +3540,7 @@

<property>
<name>dfs.datanode.lock.fair</name>
<value>true</value>
<value>false</value>
<description>If this is true, the Datanode FsDataset lock will be used in Fair
mode, which will help to prevent writer threads from being starved, but can
lower lock throughput. See java.util.concurrent.locks.ReentrantReadWriteLock
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