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HDFS-14238. A log in NNThroughputBenchmark should change log level to INFO instead of ERROR. Contributed by Shen Yinjie.

HDFS-14162. [SBN read] Allow Balancer to work with Observer node. Add a new ProxyCombiner allowing for multiple related protocols to be combined. Allow AlignmentContext to be passed in NameNodeProxyFactory. Contributed by Erik Krogen.

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    ./balancer/TestBalancerWithHANameNodes.java
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HDFS-14754. Erasure Coding : The number of Under-Replicated Blocks never reduced(addendum). Contributed by Surendra Singh Lilhore.

HDFS-14754. Erasure Coding : The number of Under-Replicated Blocks never reduced(addendum). Contributed by Surendra Singh Lilhore.

(cherry picked from commit d76e2655ace56490a92da70bde9e651ce515f80c)

HDFS-14754. Erasure Coding : The number of Under-Replicated Blocks never reduced(addendum). Contributed by Surendra Singh Lilhore.

(cherry picked from commit d76e2655ace56490a92da70bde9e651ce515f80c)

HDFS-14859. Prevent unnecessary evaluation of costly operation getNumLiveDataNodes when dfs.namenode.safemode.min.datanodes is not zero. Contributed by Srinivasu Majeti.

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    ./blockmanagement/TestBlockManagerSafeMode.java
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HDFS-14859. Prevent unnecessary evaluation of costly operation getNumLiveDataNodes when dfs.namenode.safemode.min.datanodes is not zero. Contributed by Srinivasu Majeti.

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    ./blockmanagement/TestBlockManagerSafeMode.java
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HDFS-14859. Prevent unnecessary evaluation of costly operation getNumLiveDataNodes when dfs.namenode.safemode.min.datanodes is not zero. Contributed by Srinivasu Majeti.

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    ./blockmanagement/TestBlockManagerSafeMode.java
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HDFS-14637. Namenode may not replicate blocks to meet the policy after enabling upgradeDomain. Contributed by Stephen O'Donnell.

Reviewed-by: Ayush Saxena <ayushsaxena@apache.org>

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>

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    ./blockmanagement/BlockManagerTestUtil.java
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    ./blockmanagement/TestBlockPlacementStatusDefault.java
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    ./blockmanagement/TestBlockPlacementStatusWithUpgradeDomain.java
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    ./blockmanagement/TestBlocksWithNotEnoughRacks.java
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HDFS-14637. Namenode may not replicate blocks to meet the policy after enabling upgradeDomain. Contributed by Stephen O'Donnell.

Reviewed-by: Ayush Saxena <ayushsaxena@apache.org>

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>

(cherry picked from commit c99a12167ff9566012ef32104a3964887d62c899)

Conflicts:

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlocksWithNotEnoughRacks.java

hadoop-tools/hadoop-dynamometer/hadoop-dynamometer-infra/src/main/java/org/apache/hadoop/tools/dynamometer/BlockPlacementPolicyAlwaysSatisfied.java

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    ./blockmanagement/BlockManagerTestUtil.java
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    ./blockmanagement/TestBlockPlacementStatusDefault.java
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    ./blockmanagement/TestBlockPlacementStatusWithUpgradeDomain.java
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    ./blockmanagement/TestBlocksWithNotEnoughRacks.java
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HDFS-14637. Namenode may not replicate blocks to meet the policy after enabling upgradeDomain. Contributed by Stephen O'Donnell.

Reviewed-by: Ayush Saxena <ayushsaxena@apache.org>

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>

(cherry picked from commit c99a12167ff9566012ef32104a3964887d62c899)

Conflicts:

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlocksWithNotEnoughRacks.java

hadoop-tools/hadoop-dynamometer/hadoop-dynamometer-infra/src/main/java/org/apache/hadoop/tools/dynamometer/BlockPlacementPolicyAlwaysSatisfied.java

(cherry picked from commit 966193153f9cd75e009c8db3502e1b3ba2cdfa25)

Conflicts:

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlocksWithNotEnoughRacks.java

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    ./blockmanagement/BlockManagerTestUtil.java
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    ./blockmanagement/TestBlockPlacementStatusDefault.java
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    ./blockmanagement/TestBlockPlacementStatusWithUpgradeDomain.java
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    ./blockmanagement/TestBlocksWithNotEnoughRacks.java
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HDFS-14889. Ability to check if a block has a replica on provided storage. Contributed by Ashvin Agrawal. (#1573)"

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    ./blockmanagement/TestBlockInfo.java
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HDFS-12979. StandbyNode should upload FsImage to ObserverNode after checkpointing. Contributed by Chen Liang.

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    ./namenode/ha/TestStandbyCheckpoints.java
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HDFS-14858. [SBN read] Allow configurably enable/disable AlignmentContext on NameNode. Contributed by Chen Liang.

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    ./namenode/ha/TestConsistentReadsObserver.java
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    ./namenode/ha/TestMultiObserverNode.java
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HDFS-14858. [SBN read] Allow configurably enable/disable AlignmentContext on NameNode. Contributed by Chen Liang.

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    ./namenode/ha/TestConsistentReadsObserver.java
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    ./namenode/ha/TestMultiObserverNode.java
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HDFS-14858. [SBN read] Allow configurably enable/disable AlignmentContext on NameNode. Contributed by Chen Liang.

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    ./namenode/ha/TestConsistentReadsObserver.java
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    ./namenode/ha/TestMultiObserverNode.java
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HDFS-14858. [SBN read] Allow configurably enable/disable AlignmentContext on NameNode. Contributed by Chen Liang.

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    ./namenode/ha/TestConsistentReadsObserver.java
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    ./namenode/ha/TestMultiObserverNode.java
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Revert "HDFS-14492. Snapshot memory leak. Contributed by Wei-Chiu Chuang. (#1370)"

This reverts commit 6ef6594c7ee09b561e42c16ce4e91c0479908ad8.

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HDFS-14492. Snapshot memory leak. Contributed by Wei-Chiu Chuang. (#1370)

* HDFS-14492. Snapshot memory leak. Contributed by Wei-Chiu Chuang.

Change-Id: I9e5e450c07ad70aa1905973896c4f627042dbd37

* Fix checkstyle

Change-Id: I16d4bd4f03a971e1ed36cf57d89dc42357ef8fbf

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HDFS-14305. Fix serial number calculation in BlockTokenSecretManager to avoid token key ID overlap between NameNodes. Contributed by Konstantin V Shvachko.

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    ./namenode/ha/TestFailoverWithBlockTokensEnabled.java
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HDFS-14305. Fix serial number calculation in BlockTokenSecretManager to avoid token key ID overlap between NameNodes. Contributed by Konstantin V Shvachko.

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    ./namenode/ha/TestFailoverWithBlockTokensEnabled.java
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HDFS-14305. Fix serial number calculation in BlockTokenSecretManager to avoid token key ID overlap between NameNodes. Contributed by Konstantin V Shvachko.

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    ./namenode/ha/TestFailoverWithBlockTokensEnabled.java
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HDFS-14305. Fix serial number calculation in BlockTokenSecretManager to avoid token key ID overlap between NameNodes. Contributed by Konstantin V Shvachko.

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    ./namenode/ha/TestFailoverWithBlockTokensEnabled.java
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Revert "HDFS-14305. Fix serial number calculation in BlockTokenSecretManager to avoid token key ID overlap between NameNodes. Contributed by He Xiaoqiao."

This reverts commit 0feba4396f6e96c332743a39f965de7995b67bde.

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    ./namenode/ha/TestFailoverWithBlockTokensEnabled.java
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Revert "HDFS-14305. Fix serial number calculation in BlockTokenSecretManager to avoid token key ID overlap between NameNodes. Contributed by He Xiaoqiao."

This reverts commit 0feba4396f6e96c332743a39f965de7995b67bde.

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    ./namenode/ha/TestFailoverWithBlockTokensEnabled.java
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Revert "HDFS-14305. Fix serial number calculation in BlockTokenSecretManager to avoid token key ID overlap between NameNodes. Contributed by He Xiaoqiao."

This reverts commit 0feba4396f6e96c332743a39f965de7995b67bde.

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    ./namenode/ha/TestFailoverWithBlockTokensEnabled.java
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HDFS-14849. Erasure Coding: the internal block is replicated many times when datanode is decommissioning. Contributed by HuangTao.

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    ./blockmanagement/TestBlockManager.java
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HDFS-14849. Erasure Coding: the internal block is replicated many times when datanode is decommissioning. Contributed by HuangTao.

(cherry picked from commit c4c8d5fd0e3c17ccdcf18ece8e005f510328b060)

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    ./blockmanagement/TestBlockManager.java
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HDFS-14849. Erasure Coding: the internal block is replicated many times when datanode is decommissioning. Contributed by HuangTao.

(cherry picked from commit c4c8d5fd0e3c17ccdcf18ece8e005f510328b060)

(cherry picked from commit 9a9edfa87ebb007b1dda089a166184fbb6797820)

Conflicts:

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockManager.java

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    ./blockmanagement/TestBlockManager.java
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Revert "HDFS-14849. Erasure Coding: the internal block is replicated many times when datanode is decommissioning. Contributed by HuangTao."

This reverts commit ce58c05f1d89a72c787f3571f78a9464d0ab3933.

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    ./blockmanagement/TestBlockManager.java
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