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This page tells you how to work with Git. See HowToContribute How To Contribute for instructions on building and testing Hadoop.
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Key Git Concepts
The key concepts of Git.
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You need a copy of git on your system. Some IDEs ship with Git support; this page assumes you are using the command line.
Clone a local Git repository from the Apache repository. The Hadoop subprojects (common, HDFS, and MapReduce) live inside a combined repository called `hadoop.git`.
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git clone git://git.apache.org/hadoop.git |
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https://git-wip-usgitbox.apache.org/repos/asf/hadoop.git |
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Then generate a patch file listing the differences between your trunk and your branch
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git diff --no-prefix trunk > ../hadoop-patches/HDFS-775-1.patch |
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diff --git src/java/org/apache/hadoop/hdfs/server/datanode/FSDataset.java src/java/org/apache/hadoop/hdfs/server/datanode/FSDataset.java
index 42ba15e..6383239 100644
--- src/java/org/apache/hadoop/hdfs/server/datanode/FSDataset.java
+++ src/java/org/apache/hadoop/hdfs/server/datanode/FSDataset.java
@@ -355,12 +355,14 @@ public class FSDataset implements FSConstants, FSDatasetInterface {
return dfsUsage.getUsed();
}
+ /**
+ * Calculate the capacity of the filesystem, after removing any
+ * reserved capacity.
+ * @return the unreserved number of bytes left in this filesystem. May be zero.
+ */
long getCapacity() throws IOException {
- if (reserved > usage.getCapacity()) {
- return 0;
- }
-
- return usage.getCapacity()-reserved;
+ long remaining = usage.getCapacity() - reserved;
+ return remaining > 0 ? remaining : 0;
}
long getAvailable() throws IOException { |
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Updating your patch
If your patch is not immediately accepted, do not be offended: it happens to us all. It introduces a problem: your branches become out of date. You need to check out the latest apache version, merge your branches with it, and then push the changes back to GitHub.
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