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Posted to common-commits@hadoop.apache.org by we...@apache.org on 2019/09/13 17:36:59 UTC
[hadoop] 02/02: HDFS-14821. Make HDFS-14617 (fsimage sub-sections)
off by default. Contributed by Stephen O'Donnell.
This is an automated email from the ASF dual-hosted git repository.
weichiu pushed a commit to branch trunk
in repository https://gitbox.apache.org/repos/asf/hadoop.git
commit 06ad6540b3cdb8fb957f900aaebc9d1d289fabaf
Author: Stephen O'Donnell <so...@cloudera.com>
AuthorDate: Fri Sep 13 10:35:10 2019 -0700
HDFS-14821. Make HDFS-14617 (fsimage sub-sections) off by default. Contributed by Stephen O'Donnell.
Signed-off-by: Wei-Chiu Chuang <we...@apache.org>
---
.../src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java | 2 +-
.../hadoop-hdfs/src/main/resources/hdfs-default.xml | 7 ++++++-
2 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
index 6f76dc0..4b2058b 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
@@ -899,7 +899,7 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
public static final String DFS_IMAGE_PARALLEL_LOAD_KEY =
"dfs.image.parallel.load";
- public static final boolean DFS_IMAGE_PARALLEL_LOAD_DEFAULT = true;
+ public static final boolean DFS_IMAGE_PARALLEL_LOAD_DEFAULT = false;
public static final String DFS_IMAGE_PARALLEL_TARGET_SECTIONS_KEY =
"dfs.image.parallel.target.sections";
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml b/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
index 69017df..d2ca0af 100755
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
@@ -1393,7 +1393,7 @@
<property>
<name>dfs.image.parallel.load</name>
- <value>true</value>
+ <value>false</value>
<description>
If true, write sub-section entries to the fsimage index so it can
be loaded in parallel. Also controls whether parallel loading
@@ -1403,6 +1403,11 @@
Parallel loading is not compatible with image compression,
so if dfs.image.compress is set to true this setting will be
ignored and no parallel loading will occur.
+ Enabling this feature may impact rolling upgrades and downgrades if
+ the previous version does not support this feature. If the feature was
+ enabled and a downgrade is required, first set this parameter to
+ false and then save the namespace to create a fsimage with no
+ sub-sections and then perform the downgrade.
</description>
</property>
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