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https://issues.apache.org/jira/browse/HDFS-14546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16872469#comment-16872469
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Ayush Saxena commented on HDFS-14546:
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* Fix the whitespace warning. \{{only one replica will be lost at the maximum.
}} Remove space Here after "*.*"
* This change isn't required :
{code:java}
-<!-- MACRO{toc|fromDepth=0|toDepth=3} -->
+* [HDFS Architecture](#HDFS_Architecture)
+ * [Introduction](#Introduction)
+ * [Assumptions and Goals](#Assumptions_and_Goals)
+ * [Hardware Failure](#Hardware_Failure)
+ * [Streaming Data Access](#Streaming_Data_Access)
+ * [Large Data Sets](#Large_Data_Sets)
+ * [Simple Coherency Model](#Simple_Coherency_Model)
+ * ["Moving Computation is Cheaper than Moving
Data"](#aMoving_Computation_is_Cheaper_than_Moving_Data)
+ * [Portability Across Heterogeneous Hardware and Software
Platforms](#Portability_Across_Heterogeneous_Hardware_and_Software_Platforms)
+ * [NameNode and DataNodes](#NameNode_and_DataNodes)
+ * [The File System Namespace](#The_File_System_Namespace)
+ * [Data Replication](#Data_Replication)
+ * [Replica Placement: The First Baby
Steps](#Replica_Placement:_The_First_Baby_Steps)
+ * [Replica Selection](#Replica_Selection)
+ * [Safemode](#Safemode)
+ * [Block Placement Policies](#Block_Placement_Policies)
+ *
[AvailableSpaceBlockPlacementPolicy](#Available_Space_Block_Placement_Policy)
+ *
[BlockPlacementPolicyRackFaultTolerant](#Block_Placement_Policy_RackFault_Tolerant)
+ *
[BlockPlacementPolicyWithNodeGroup](#BlockPlacement_Policy_With_NodeGroup)
+ *
[BlockPlacementPolicyWithUpgradeDomain](#BlockPlacement_Policy_With_UpgradeDomain)
+ * [The Persistence of File System
Metadata](#The_Persistence_of_File_System_Metadata)
+ * [The Communication Protocols](#The_Communication_Protocols)
+ * [Robustness](#Robustness)
+ * [Data Disk Failure, Heartbeats and
Re-Replication](#Data_Disk_Failure_Heartbeats_and_Re-Replication)
+ * [Cluster Rebalancing](#Cluster_Rebalancing)
+ * [Data Integrity](#Data_Integrity)
+ * [Metadata Disk Failure](#Metadata_Disk_Failure)
+ * [Snapshots](#Snapshots)
+ * [Data Organization](#Data_Organization)
+ * [Data Blocks](#Data_Blocks)
+ * [Staging](#Staging)
+ * [Replication Pipelining](#Replication_Pipelining)
+ * [Accessibility](#Accessibility)
+ * [FS Shell](#FS_Shell)
+ * [DFSAdmin](#DFSAdmin)
+ * [Browser Interface](#Browser_Interface)
+ * [Space Reclamation](#Space_Reclamation)
+ * [File Deletes and Undeletes](#File_Deletes_and_Undeletes)
+ * [Decrease Replication Factor](#Decrease_Replication_Factor)
+ * [References](#References)
{code}
> Document block placement policies
> ---------------------------------
>
> Key: HDFS-14546
> URL: https://issues.apache.org/jira/browse/HDFS-14546
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Íñigo Goiri
> Assignee: Amithsha
> Priority: Major
> Labels: documentation
> Attachments: HDFS-14546-01.patch, HDFS-14546-02.patch,
> HDFS-14546-03.patch, HdfsDesign.patch
>
>
> Currently, all the documentation refers to the default block placement policy.
> However, over time there have been new policies:
> * BlockPlacementPolicyRackFaultTolerant (HDFS-7891)
> * BlockPlacementPolicyWithNodeGroup (HDFS-3601)
> * BlockPlacementPolicyWithUpgradeDomain (HDFS-9006)
> We should update the documentation to refer to them explaining their
> particularities and probably how to setup each one of them.
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