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HDFS-4618. Default transaction interval for checkpoints is too low. Contributed by Todd Lipcon. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1461783 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Todd Lipcon 2013-03-27 18:46:32 +00:00
parent 81192e4e41
commit 4809bfa6ed
4 changed files with 6 additions and 4 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -373,6 +373,8 @@ Release 2.0.5-beta - UNRELEASED
HDFS-4621. Additional logging to help diagnose slow QJM syncs. (todd)
HDFS-4618. Default transaction interval for checkpoints is too low. (todd)
OPTIMIZATIONS
BUG FIXES

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
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@ -122,7 +122,7 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
public static final String DFS_NAMENODE_CHECKPOINT_PERIOD_KEY = "dfs.namenode.checkpoint.period";
public static final long DFS_NAMENODE_CHECKPOINT_PERIOD_DEFAULT = 3600;
public static final String DFS_NAMENODE_CHECKPOINT_TXNS_KEY = "dfs.namenode.checkpoint.txns";
public static final long DFS_NAMENODE_CHECKPOINT_TXNS_DEFAULT = 40000;
public static final long DFS_NAMENODE_CHECKPOINT_TXNS_DEFAULT = 1000000;
public static final String DFS_NAMENODE_CHECKPOINT_MAX_RETRIES_KEY = "dfs.namenode.checkpoint.max-retries";
public static final int DFS_NAMENODE_CHECKPOINT_MAX_RETRIES_DEFAULT = 3;
public static final String DFS_NAMENODE_HEARTBEAT_RECHECK_INTERVAL_KEY = "dfs.namenode.heartbeat.recheck-interval";

2
hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
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@ -635,7 +635,7 @@
<property>
<name>dfs.namenode.checkpoint.txns</name>
<value>40000</value>
<value>1000000</value>
<description>The Secondary NameNode or CheckpointNode will create a checkpoint
of the namespace every 'dfs.namenode.checkpoint.txns' transactions, regardless
of whether 'dfs.namenode.checkpoint.period' has expired.

4
hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HdfsUserGuide.apt.vm
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@ -193,7 +193,7 @@ HDFS Users Guide
* <<<dfs.namenode.checkpoint.period>>>, set to 1 hour by default, specifies
the maximum delay between two consecutive checkpoints, and
* <<<dfs.namenode.checkpoint.txns>>>, set to 40000 default, defines the
* <<<dfs.namenode.checkpoint.txns>>>, set to 1 million by default, defines the
number of uncheckpointed transactions on the NameNode which will
force an urgent checkpoint, even if the checkpoint period has not
been reached.
@ -232,7 +232,7 @@ HDFS Users Guide
* <<<dfs.namenode.checkpoint.period>>>, set to 1 hour by default, specifies
the maximum delay between two consecutive checkpoints
* <<<dfs.namenode.checkpoint.txns>>>, set to 40000 default, defines the
* <<<dfs.namenode.checkpoint.txns>>>, set to 1 million by default, defines the
number of uncheckpointed transactions on the NameNode which will
force an urgent checkpoint, even if the checkpoint period has not
been reached.