HDFS-2397. Undeprecate SecondaryNameNode. Contributed by Eli Collins
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1235135 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Eli Collins
parent
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@ -753,11 +753,6 @@
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<section>
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<title> secondarynamenode </title>
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<note>
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The Secondary NameNode has been deprecated. Instead, consider using the
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<a href="http://hadoop.apache.org/hdfs/docs/current/hdfs_user_guide.html#Checkpoint+Node">Checkpoint Node</a> or
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<a href="http://hadoop.apache.org/hdfs/docs/current/hdfs_user_guide.html#Backup+Node">Backup Node</a>.
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</note>
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<p>
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Runs the HDFS secondary
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namenode. See <a href="http://hadoop.apache.org/hdfs/docs/current/hdfs_user_guide.html#Secondary+NameNode">Secondary NameNode</a>
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@ -276,6 +276,8 @@ Release 0.23.1 - UNRELEASED
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HDFS-2818. Fix a missing space issue in HDFS webapps' title tags. (Devaraj K via harsh)
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HDFS-2397. Undeprecate SecondaryNameNode (eli)
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OPTIMIZATIONS
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HDFS-2130. Switch default checksum to CRC32C. (todd)
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@ -112,17 +112,18 @@
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problems.
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</li>
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<li>
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Secondary NameNode (deprecated): performs periodic checkpoints of the
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Secondary NameNode: performs periodic checkpoints of the
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namespace and helps keep the size of file containing log of HDFS
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modifications within certain limits at the NameNode.
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Replaced by Checkpoint node.
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</li>
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<li>
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Checkpoint node: performs periodic checkpoints of the namespace and
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helps minimize the size of the log stored at the NameNode
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containing changes to the HDFS.
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Replaces the role previously filled by the Secondary NameNode.
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NameNode allows multiple Checkpoint nodes simultaneously,
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Replaces the role previously filled by the Secondary NameNode,
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though is not yet battle hardened.
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The NameNode allows multiple Checkpoint nodes simultaneously,
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as long as there are no Backup nodes registered with the system.
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</li>
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<li>
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@ -132,6 +133,7 @@
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which is always in sync with the active NameNode namespace state.
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Only one Backup node may be registered with the NameNode at once.
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</li>
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</ul>
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</li>
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</ul>
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@ -234,12 +236,6 @@
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</section>
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<section> <title>Secondary NameNode</title>
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<note>
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The Secondary NameNode has been deprecated.
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Instead, consider using the
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<a href="hdfs_user_guide.html#Checkpoint+node">Checkpoint Node</a> or
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<a href="hdfs_user_guide.html#Backup+node">Backup Node</a>.
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</note>
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<p>
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The NameNode stores modifications to the file system as a log
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appended to a native file system file, <code>edits</code>.
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@ -287,7 +283,9 @@
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<a href="http://hadoop.apache.org/common/docs/current/commands_manual.html#secondarynamenode">secondarynamenode</a>.
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</p>
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</section><section> <title> Checkpoint Node </title>
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</section>
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<section> <title> Checkpoint Node </title>
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<p>NameNode persists its namespace using two files: <code>fsimage</code>,
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which is the latest checkpoint of the namespace and <code>edits</code>,
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a journal (log) of changes to the namespace since the checkpoint.
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@ -87,7 +87,6 @@ import com.google.common.collect.ImmutableList;
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* primary NameNode.
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*
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**********************************************************/
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@Deprecated // use BackupNode with -checkpoint argument instead.
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@InterfaceAudience.Private
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public class SecondaryNameNode implements Runnable {
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@ -204,7 +204,6 @@ public class TestCheckpoint extends TestCase {
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/*
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* Simulate namenode crashing after rolling edit log.
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*/
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@SuppressWarnings("deprecation")
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public void testSecondaryNamenodeError1()
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throws IOException {
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LOG.info("Starting testSecondaryNamenodeError1");
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@ -266,7 +265,6 @@ public class TestCheckpoint extends TestCase {
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/*
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* Simulate a namenode crash after uploading new image
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*/
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@SuppressWarnings("deprecation")
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public void testSecondaryNamenodeError2() throws IOException {
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LOG.info("Starting testSecondaryNamenodeError2");
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Configuration conf = new HdfsConfiguration();
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@ -325,7 +323,6 @@ public class TestCheckpoint extends TestCase {
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/*
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* Simulate a secondary namenode crash after rolling the edit log.
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*/
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@SuppressWarnings("deprecation")
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public void testSecondaryNamenodeError3() throws IOException {
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LOG.info("Starting testSecondaryNamenodeError3");
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Configuration conf = new HdfsConfiguration();
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@ -395,7 +392,6 @@ public class TestCheckpoint extends TestCase {
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* back to the name-node.
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* Used to truncate primary fsimage file.
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*/
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@SuppressWarnings("deprecation")
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public void testSecondaryFailsToReturnImage() throws IOException {
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LOG.info("Starting testSecondaryFailsToReturnImage");
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Configuration conf = new HdfsConfiguration();
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@ -472,7 +468,6 @@ public class TestCheckpoint extends TestCase {
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* @param errorType the ErrorSimulator type to trigger
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* @param exceptionSubstring an expected substring of the triggered exception
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*/
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@SuppressWarnings("deprecation")
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private void doSendFailTest(int errorType, String exceptionSubstring)
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throws IOException {
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Configuration conf = new HdfsConfiguration();
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@ -587,7 +582,6 @@ public class TestCheckpoint extends TestCase {
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/**
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* Test that the SecondaryNameNode properly locks its storage directories.
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*/
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@SuppressWarnings("deprecation")
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public void testSecondaryNameNodeLocking() throws Exception {
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// Start a primary NN so that the secondary will start successfully
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Configuration conf = new HdfsConfiguration();
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@ -680,7 +674,6 @@ public class TestCheckpoint extends TestCase {
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* 2. if the NN does not contain an image, importing a checkpoint
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* succeeds and re-saves the image
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*/
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@SuppressWarnings("deprecation")
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public void testImportCheckpoint() throws Exception {
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Configuration conf = new HdfsConfiguration();
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Path testPath = new Path("/testfile");
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@ -761,16 +754,12 @@ public class TestCheckpoint extends TestCase {
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throw new IOException("Cannot create directory " + dir);
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}
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// This deprecation suppress warning does not work due to known Java bug:
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// http://bugs.sun.com/view_bug.do?bug_id=6460147
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@SuppressWarnings("deprecation")
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SecondaryNameNode startSecondaryNameNode(Configuration conf
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) throws IOException {
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conf.set(DFSConfigKeys.DFS_NAMENODE_SECONDARY_HTTP_ADDRESS_KEY, "0.0.0.0:0");
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return new SecondaryNameNode(conf);
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}
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@SuppressWarnings("deprecation")
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SecondaryNameNode startSecondaryNameNode(Configuration conf, int index)
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throws IOException {
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Configuration snnConf = new Configuration(conf);
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@ -783,7 +772,6 @@ public class TestCheckpoint extends TestCase {
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/**
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* Tests checkpoint in HDFS.
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*/
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@SuppressWarnings("deprecation")
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public void testCheckpoint() throws IOException {
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Path file1 = new Path("checkpoint.dat");
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Path file2 = new Path("checkpoint2.dat");
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@ -1010,7 +998,6 @@ public class TestCheckpoint extends TestCase {
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* - it then fails again for the same reason
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* - it then tries to checkpoint a third time
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*/
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@SuppressWarnings("deprecation")
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public void testCheckpointAfterTwoFailedUploads() throws IOException {
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MiniDFSCluster cluster = null;
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SecondaryNameNode secondary = null;
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@ -1065,7 +1052,6 @@ public class TestCheckpoint extends TestCase {
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*
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* @throws IOException
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*/
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@SuppressWarnings("deprecation")
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public void testMultipleSecondaryNamenodes() throws IOException {
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Configuration conf = new HdfsConfiguration();
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String nameserviceId1 = "ns1";
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@ -1115,7 +1101,6 @@ public class TestCheckpoint extends TestCase {
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* Test that the secondary doesn't have to re-download image
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* if it hasn't changed.
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*/
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@SuppressWarnings("deprecation")
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public void testSecondaryImageDownload() throws IOException {
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LOG.info("Starting testSecondaryImageDownload");
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Configuration conf = new HdfsConfiguration();
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@ -1198,7 +1183,6 @@ public class TestCheckpoint extends TestCase {
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* It verifies that this works even though the earlier-txid checkpoint gets
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* uploaded after the later-txid checkpoint.
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*/
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@SuppressWarnings("deprecation")
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public void testMultipleSecondaryNNsAgainstSameNN() throws Exception {
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Configuration conf = new HdfsConfiguration();
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@ -1284,7 +1268,6 @@ public class TestCheckpoint extends TestCase {
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* It verifies that one of the two gets an error that it's uploading a
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* duplicate checkpoint, and the other one succeeds.
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*/
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@SuppressWarnings("deprecation")
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public void testMultipleSecondaryNNsAgainstSameNN2() throws Exception {
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Configuration conf = new HdfsConfiguration();
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@ -1383,7 +1366,6 @@ public class TestCheckpoint extends TestCase {
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* is running. The secondary should shut itself down if if talks to a NN
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* with the wrong namespace.
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*/
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@SuppressWarnings("deprecation")
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public void testReformatNNBetweenCheckpoints() throws IOException {
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MiniDFSCluster cluster = null;
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SecondaryNameNode secondary = null;
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@ -1638,7 +1620,6 @@ public class TestCheckpoint extends TestCase {
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/**
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* Test that the 2NN triggers a checkpoint after the configurable interval
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*/
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@SuppressWarnings("deprecation")
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public void testCheckpointTriggerOnTxnCount() throws Exception {
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MiniDFSCluster cluster = null;
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SecondaryNameNode secondary = null;
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@ -1692,7 +1673,6 @@ public class TestCheckpoint extends TestCase {
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* logs that connect the 2NN's old checkpoint to the current txid
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* get archived. Then, the 2NN tries to checkpoint again.
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*/
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@SuppressWarnings("deprecation")
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public void testSecondaryHasVeryOutOfDateImage() throws IOException {
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MiniDFSCluster cluster = null;
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SecondaryNameNode secondary = null;
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@ -1730,7 +1710,6 @@ public class TestCheckpoint extends TestCase {
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}
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}
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@SuppressWarnings("deprecation")
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public void testCommandLineParsing() throws ParseException {
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SecondaryNameNode.CommandLineOpts opts =
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new SecondaryNameNode.CommandLineOpts();
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@ -1765,7 +1744,6 @@ public class TestCheckpoint extends TestCase {
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} catch (ParseException e) {}
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}
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@SuppressWarnings("deprecation")
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private void cleanup(SecondaryNameNode snn) {
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if (snn != null) {
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try {
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* Assert that if any two files have the same name across the 2NNs
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* and NN, they should have the same content too.
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*/
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@SuppressWarnings("deprecation")
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private void assertParallelFilesInvariant(MiniDFSCluster cluster,
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ImmutableList<SecondaryNameNode> secondaries) throws Exception {
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List<File> allCurrentDirs = Lists.newArrayList();
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@ -1793,7 +1770,6 @@ public class TestCheckpoint extends TestCase {
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ImmutableSet.of("VERSION"));
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}
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@SuppressWarnings("deprecation")
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private List<File> getCheckpointCurrentDirs(SecondaryNameNode secondary) {
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List<File> ret = Lists.newArrayList();
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for (URI u : secondary.getCheckpointDirs()) {
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@ -1803,7 +1779,6 @@ public class TestCheckpoint extends TestCase {
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return ret;
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}
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@SuppressWarnings("deprecation")
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private CheckpointStorage spyOnSecondaryImage(SecondaryNameNode secondary1) {
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CheckpointStorage spy = Mockito.spy((CheckpointStorage)secondary1.getFSImage());;
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secondary1.setFSImage(spy);
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@ -1813,7 +1788,6 @@ public class TestCheckpoint extends TestCase {
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/**
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* A utility class to perform a checkpoint in a different thread.
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*/
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@SuppressWarnings("deprecation")
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private static class DoCheckpointThread extends Thread {
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private final SecondaryNameNode snn;
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private volatile Throwable thrown = null;
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@ -120,9 +120,6 @@ public class TestNameEditsConfigs {
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assertTrue(!fileSys.exists(name));
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}
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// This deprecation suppress warning does not work due to known Java bug:
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// http://bugs.sun.com/view_bug.do?bug_id=6460147
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@SuppressWarnings("deprecation")
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SecondaryNameNode startSecondaryNameNode(Configuration conf
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) throws IOException {
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conf.set(DFSConfigKeys.DFS_NAMENODE_SECONDARY_HTTP_ADDRESS_KEY, "0.0.0.0:0");
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@ -142,7 +139,6 @@ public class TestNameEditsConfigs {
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* sure we are reading proper edits and image.
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* @throws Exception
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*/
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@SuppressWarnings("deprecation")
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@Test
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public void testNameEditsConfigs() throws Exception {
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Path file1 = new Path("TestNameEditsConfigs1");
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@ -30,7 +30,6 @@ import org.junit.Test;
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public class TestSecondaryWebUi {
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@SuppressWarnings("deprecation")
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@Test
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public void testSecondaryWebUi() throws IOException {
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Configuration conf = new Configuration();
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@ -121,7 +121,6 @@ public class TestStartup extends TestCase {
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* start MiniDFScluster, create a file (to create edits) and do a checkpoint
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* @throws IOException
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*/
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@SuppressWarnings("deprecation")
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public void createCheckPoint() throws IOException {
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LOG.info("--starting mini cluster");
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// manage dirs parameter set to false
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@ -303,7 +302,6 @@ public class TestStartup extends TestCase {
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* secondary node copies fsimage and edits into correct separate directories.
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* @throws IOException
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*/
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@SuppressWarnings("deprecation")
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public void testSNNStartup() throws IOException{
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//setUpConfig();
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LOG.info("--starting SecondNN startup test");
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@ -155,7 +155,6 @@ public class TestStorageRestore {
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* 7. run doCheckpoint
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* 8. verify that all the image and edits files are the same.
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*/
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@SuppressWarnings("deprecation")
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@Test
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public void testStorageRestore() throws Exception {
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int numDatanodes = 0;
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@ -312,7 +311,6 @@ public class TestStorageRestore {
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* then try to perform a checkpoint. The NN should not serve up the image or
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* edits from the restored (empty) dir.
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*/
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@SuppressWarnings("deprecation")
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@Test
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public void testMultipleSecondaryCheckpoint() throws IOException {
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@ -95,7 +95,7 @@ Hadoop MapReduce Next Generation - Cluster Setup
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*--------------------------------------+--------------------------------------+
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| DataNode | HADOOP_DATANODE_OPTS |
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*--------------------------------------+--------------------------------------+
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| Backup NameNode | HADOOP_SECONDARYNAMENODE_OPTS |
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| Secondary NameNode | HADOOP_SECONDARYNAMENODE_OPTS |
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*--------------------------------------+--------------------------------------+
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| ResourceManager | YARN_RESOURCEMANAGER_OPTS |
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*--------------------------------------+--------------------------------------+
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@ -537,15 +537,15 @@ Hadoop MapReduce Next Generation - Cluster Setup
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It's recommended to have them share a Unix group, for e.g. <<<hadoop>>>.
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*--------------------------------------+--------------------------------------+
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*--------------------------------------+----------------------------------------------------------------------+
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|| User:Group || Daemons |
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*--------------------------------------+--------------------------------------+
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| hdfs:hadoop | NameNode, Backup NameNode, DataNode |
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*--------------------------------------+--------------------------------------+
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*--------------------------------------+----------------------------------------------------------------------+
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| hdfs:hadoop | NameNode, Secondary NameNode, Checkpoint Node, Backup Node, DataNode |
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*--------------------------------------+----------------------------------------------------------------------+
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| yarn:hadoop | ResourceManager, NodeManager |
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*--------------------------------------+--------------------------------------+
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*--------------------------------------+----------------------------------------------------------------------+
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| mapred:hadoop | MapReduce JobHistory Server |
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*--------------------------------------+--------------------------------------+
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*--------------------------------------+----------------------------------------------------------------------+
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* <<<Permissions for both HDFS and local fileSystem paths>>>
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