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https://issues.apache.org/jira/browse/HDFS-8647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15037076#comment-15037076
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Xiao Chen commented on HDFS-8647:
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Summary from branch-2.7 backport to branch-2.6 below:
-
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
(HDFS-7411 which is in 2.7 but not 2.6. Resolved by copying over 2.7 but
removing changes related to HDFS-7411. Also multiple branch2.6 fixes: 1.
Changed a couple of initializing statements to fix the error 'diamond operator
is not supported in -source 1.6'. 2. Updated log statement in
BlockManager.java#2928 to not use placeholder syntax.
-
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicy.java
(import conflicts.)
-
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java
(import conflicts. Also fixed diamond operators to compile.)
-
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/balancer/TestBalancer.java
(The test {{TestBalancer#testBalancerWithPinnedBlocks}} from HDFS-6133 in 2.7
but not in 2.6. Resolved by not bringing in.)
-
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockManager.java
1 line conflict in HDFS-9083’s new test
-
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestReplicationPolicy.java
(import conflicts. Also fixed diamond operators to compile.)
-
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestDNFencing.java
(import conflicts.)
> Abstract BlockManager's rack policy into BlockPlacementPolicy
> -------------------------------------------------------------
>
> Key: HDFS-8647
> URL: https://issues.apache.org/jira/browse/HDFS-8647
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Ming Ma
> Assignee: Brahma Reddy Battula
> Fix For: 2.8.0
>
> Attachments: HDFS-8647-001.patch, HDFS-8647-002.patch,
> HDFS-8647-003.patch, HDFS-8647-004.patch, HDFS-8647-004.patch,
> HDFS-8647-005.patch, HDFS-8647-006.patch, HDFS-8647-007.patch,
> HDFS-8647-008.patch, HDFS-8647-009.patch, HDFS-8647-branch26.patch,
> HDFS-8647-branch27.patch
>
>
> Sometimes we want to have namenode use alternative block placement policy
> such as upgrade domains in HDFS-7541.
> BlockManager has built-in assumption about rack policy in functions such as
> useDelHint, blockHasEnoughRacks. That means when we have new block placement
> policy, we need to modify BlockManager to account for the new policy. Ideally
> BlockManager should ask BlockPlacementPolicy object instead. That will allow
> us to provide new BlockPlacementPolicy without changing BlockManager.
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