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HDFS-2759. Pre-allocate HDFS edit log files after writing version number. Contributed by Aaron T. Myers.

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1237153 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Aaron Myers 2012-01-28 20:26:13 +00:00
parent 934047630a
commit 976c07696d
3 changed files with 11 additions and 6 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -172,6 +172,9 @@ Trunk (unreleased changes)
HDFS-2768. BackupNode stop can not close proxy connections because
it is not a proxy instance. (Uma Maheswara Rao G via eli)
HDFS-2759. Pre-allocate HDFS edit log files after writing version number.
(atm)
Release 0.23.1 - UNRELEASED
INCOMPATIBLE CHANGES

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/EditLogFileOutputStream.java
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@ -167,10 +167,10 @@ protected void flushAndSync() throws IOException {
LOG.info("Nothing to flush");
return;
}
preallocate(); // preallocate file if necessary
doubleBuf.flushTo(fp);
fc.force(false); // metadata updates not needed because of preallocation
fc.force(false); // metadata updates not needed
fc.position(fc.position() - 1); // skip back the end-of-file marker
preallocate(); // preallocate file if necessary
}
/**

10
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestEditLogFileOutputStream.java
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@ -41,6 +41,7 @@
public class TestEditLogFileOutputStream {
private final static long PREALLOCATION_LENGTH = (1024 * 1024) + 4;
private final static int HEADER_LEN = 17;
private static final File TEST_EDITS =
new File(System.getProperty("test.build.data","/tmp"),
@ -65,8 +66,9 @@ public void testPreallocation() throws IOException {
assertEquals("Edit log should contain a header as valid length",
HEADER_LEN, validation.getValidLength());
assertEquals(1, validation.getNumTransactions());
assertEquals("Edit log should have 1MB of bytes allocated",
1024*1024, editLog.length());
assertEquals("Edit log should have 1MB pre-allocated, plus 4 bytes " +
"for the version number",
PREALLOCATION_LENGTH, editLog.length());
cluster.getFileSystem().mkdirs(new Path("/tmp"),
@ -79,8 +81,8 @@ public void testPreallocation() throws IOException {
validation.getValidLength() > oldLength);
assertEquals(2, validation.getNumTransactions());
assertEquals("Edit log should be 1MB long",
1024 * 1024, editLog.length());
assertEquals("Edit log should be 1MB long, plus 4 bytes for the version number",
PREALLOCATION_LENGTH, editLog.length());
// 256 blocks for the 1MB of preallocation space
assertTrue("Edit log disk space used should be at least 257 blocks",
256 * 4096 <= new DU(editLog, conf).getUsed());