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HADOOP-9152. HDFS can report negative DFS Used on clusters with very small amounts of data. Contributed by Brock Noland. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1423604 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Aaron Myers 2012-12-18 19:50:46 +00:00
parent 01c5d0eb77
commit 026873c155
3 changed files with 12 additions and 1 deletions
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3
hadoop-common-project/hadoop-common/CHANGES.txt
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@ -202,6 +202,9 @@ Release 2.0.3-alpha - Unreleased
HADOOP-9135. JniBasedUnixGroupsMappingWithFallback should log at debug HADOOP-9135. JniBasedUnixGroupsMappingWithFallback should log at debug
rather than info during fallback. (Colin Patrick McCabe via todd) rather than info during fallback. (Colin Patrick McCabe via todd)
HADOOP-9152. HDFS can report negative DFS Used on clusters with very small
amounts of data. (Brock Noland via atm)
Release 2.0.2-alpha - 2012-09-07 Release 2.0.2-alpha - 2012-09-07
INCOMPATIBLE CHANGES INCOMPATIBLE CHANGES

2
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/DU.java
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@ -136,7 +136,7 @@ public class DU extends Shell {
} }
} }
return used.longValue(); return Math.max(used.longValue(), 0L);
} }
/** /**

8
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/TestDU.java
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@ -103,4 +103,12 @@ public class TestDU extends TestCase {
duSize >= writtenSize && duSize >= writtenSize &&
writtenSize <= (duSize + slack)); writtenSize <= (duSize + slack));
} }
public void testDUGetUsedWillNotReturnNegative() throws IOException {
File file = new File(DU_DIR, "data");
assertTrue(file.createNewFile());
DU du = new DU(file, 10000);
du.decDfsUsed(Long.MAX_VALUE);
long duSize = du.getUsed();
assertTrue(String.valueOf(duSize), duSize >= 0L);
}
} }