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HADOOP-16988. Remove source code from branch-2. (aajisaka via jhung)

This closes #1959

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    ./datanode/BlockMetadataHeader.java
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    ./datanode/ReplicaNotFoundException.java
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    ./namenode/NotReplicatedYetException.java
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    ./namenode/RetryStartFileException.java
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    ./namenode/ha/AbstractNNFailoverProxyProvider.java
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    ./namenode/ha/ClientHAProxyFactory.java
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    ./namenode/ha/ConfiguredFailoverProxyProvider.java
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    ./namenode/ha/IPFailoverProxyProvider.java
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    ./namenode/ha/ObserverReadProxyProvider.java
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    ./namenode/ha/ObserverReadProxyProviderWithIPFailover.java
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    ./namenode/ha/RequestHedgingProxyProvider.java
  1. … 10832 more files in changeset.
HDFS-15197. [SBN read] Change ObserverRetryOnActiveException log to debug. Contributed by Chen Liang.

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    ./namenode/ha/ObserverReadProxyProvider.java
HDFS-15197. [SBN read] Change ObserverRetryOnActiveException log to debug. Contributed by Chen Liang.

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    ./namenode/ha/ObserverReadProxyProvider.java
HDFS-15197. [SBN read] Change ObserverRetryOnActiveException log to debug. Contributed by Chen Liang.

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    ./namenode/ha/ObserverReadProxyProvider.java
HDFS-15197. [SBN read] Change ObserverRetryOnActiveException log to debug. Contributed by Chen Liang.

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    ./namenode/ha/ObserverReadProxyProvider.java
HDFS-15118. [SBN Read] Slow clients when Observer reads are enabled but there are no Observers on the cluster. Contributed by Chen Liang

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    ./namenode/ha/ObserverReadProxyProvider.java
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[SBN Read] Slow clients when Observer reads are enabled but there are no Observers on the cluster. Conntributed by Chen Liang

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    ./namenode/ha/ObserverReadProxyProvider.java
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[SBN Read] Slow clients when Observer reads are enabled but there are no Observers on the cluster. Contributed by Chen Liang

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    ./namenode/ha/ObserverReadProxyProvider.java
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[SBN Read] Slow clients when Observer reads are enabled but there are no Observers on the cluster. Conntributed by Chen Liang

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    ./namenode/ha/ObserverReadProxyProvider.java
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Revert "[SBN Read] Slow clients when Observer reads are enabled but there are no Observers on the cluster. Contributed by Chen Liang."

This reverts commit ff8ff0f7e50cfc147fe383b18b344b46a23220df.

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    ./namenode/ha/ObserverReadProxyProvider.java
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[SBN Read] Slow clients when Observer reads are enabled but there are no Observers on the cluster. Contributed by Chen Liang.

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    ./namenode/ha/ObserverReadProxyProvider.java
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HDFS-14937. [SBN read] ObserverReadProxyProvider should throw InterruptException. Contributed by xuzq.

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    ./namenode/ha/ObserverReadProxyProvider.java
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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    ./namenode/ha/ObserverReadProxyProvider.java
  1. … 9 more files in changeset.
HDFS-14785. [SBN read] Change client logging to be less aggressive. Contributed by Chen Liang.

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    ./namenode/ha/ObserverReadProxyProvider.java
HDFS-14785. [SBN read] Change client logging to be less aggressive. Contributed by Chen Liang.

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    ./namenode/ha/ObserverReadProxyProvider.java
HDFS-14785. [SBN read] Change client logging to be less aggressive. Contributed by Chen Liang.

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    ./namenode/ha/ObserverReadProxyProvider.java
HDFS-14785. [SBN read] Change client logging to be less aggressive. Contributed by Chen Liang.

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    ./namenode/ha/ObserverReadProxyProvider.java
HDFS-14706. Checksums are not checked if block meta file is less than 7 bytes. Contributed by Stephen O'Donnell.

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

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    ./datanode/BlockMetadataHeader.java
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    ./datanode/CorruptMetaHeaderException.java
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HDFS-14706. Checksums are not checked if block meta file is less than 7 bytes. Contributed by Stephen O'Donnell.

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

(cherry picked from commit 915cbc91c0a12cc7b4d3ef4ea951941defbbcb33)

(cherry picked from commit 2c7f49743fba587e32398c81412db9eac426cf98)

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    ./datanode/BlockMetadataHeader.java
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    ./datanode/CorruptMetaHeaderException.java
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HDFS-14706. Checksums are not checked if block meta file is less than 7 bytes. Contributed by Stephen O'Donnell.

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

(cherry picked from commit 915cbc91c0a12cc7b4d3ef4ea951941defbbcb33)

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    ./datanode/BlockMetadataHeader.java
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    ./datanode/CorruptMetaHeaderException.java
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HDFS-14673. The console log is noisy when using DNSDomainNameResolver to resolve NameNode.

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    ./namenode/ha/AbstractNNFailoverProxyProvider.java
HDFS-14245. [SBN read] Enable ObserverReadProxyProvider to work with non-ClientProtocol proxy types. Contributed by Erik Krogen.

(cherry picked from 5847e0014343f60f853cb796781ca1fa03a72efd)

(cherry picked from 6630c9b75d65deefb5550e355eef7783909a57bc)

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    ./namenode/ha/AbstractNNFailoverProxyProvider.java
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    ./namenode/ha/ObserverReadProxyProvider.java
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HDFS-14245. [SBN read] Enable ObserverReadProxyProvider to work with non-ClientProtocol proxy types. Contributed by Erik Krogen.

(cherry picked from 5847e0014343f60f853cb796781ca1fa03a72efd)

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    ./namenode/ha/AbstractNNFailoverProxyProvider.java
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    ./namenode/ha/ObserverReadProxyProvider.java
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HDFS-14245. [SBN read] Enable ObserverReadProxyProvider to work with non-ClientProtocol proxy types. Contributed by Erik Krogen.

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    ./namenode/ha/AbstractNNFailoverProxyProvider.java
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    ./namenode/ha/ObserverReadProxyProvider.java
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HDFS-14245. [SBN read] Enable ObserverReadProxyProvider to work with non-ClientProtocol proxy types. Contributed by Erik Krogen.

(cherry picked from 5847e0014343f60f853cb796781ca1fa03a72efd)

(cherry picked from 6630c9b75d65deefb5550e355eef7783909a57bc)

(cherry picked from 9fdb849e034573bb44abd593eefa1e13a3261376)

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    ./namenode/ha/AbstractNNFailoverProxyProvider.java
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    ./namenode/ha/ObserverReadProxyProvider.java
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HDFS-14435. [SBN Read] Enable ObserverReadProxyProvider to gracefully handle StandbyException when fetching HAServiceState. Contributed by Erik Krogen.

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    ./namenode/ha/ObserverReadProxyProvider.java
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HDFS-14435. [SBN Read] Enable ObserverReadProxyProvider to gracefully handle StandbyException when fetching HAServiceState. Contributed by Erik Krogen.

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    ./namenode/ha/ObserverReadProxyProvider.java
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HDFS-14435. [SBN Read] Enable ObserverReadProxyProvider to gracefully handle StandbyException when fetching HAServiceState. Contributed by Erik Krogen.

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    ./namenode/ha/ObserverReadProxyProvider.java
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HDFS-14435. [SBN Read] Enable ObserverReadProxyProvider to gracefully handle StandbyException when fetching HAServiceState. Contributed by Erik Krogen.

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    ./namenode/ha/ObserverReadProxyProvider.java
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HDFS-14435. [SBN Read] Enable ObserverReadProxyProvider to gracefully handle StandbyException when fetching HAServiceState. Contributed by Erik Krogen.

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    ./namenode/ha/ObserverReadProxyProvider.java
  1. … 2 more files in changeset.