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Date: Wed, 30 Sep 2015 16:39:21 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HDFS-7652) Process block reports for erasure
 coded blocks
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    [ https://issues.apache.org/jira/browse/HDFS-7652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14937629#comment-14937629 ] 

Hudson commented on HDFS-7652:
------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk #1203 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/1203/])
HDFS-7652. Process block reports for erasure coded blocks. Contributed (zhezhang: rev 0c1da5a0300f015a7e39f2b40a73fb06c65a78c8)
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockIdManager.java


> Process block reports for erasure coded blocks
> ----------------------------------------------
>
>                 Key: HDFS-7652
>                 URL: https://issues.apache.org/jira/browse/HDFS-7652
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>             Fix For: HDFS-7285
>
>         Attachments: HDFS-7652.001.patch, HDFS-7652.002.patch, HDFS-7652.003.patch, HDFS-7652.004.patch, HDFS-7652.005.patch, HDFS-7652.006.patch
>
>
> HDFS-7339 adds support in NameNode for persisting block groups. For memory efficiency, erasure coded blocks under the striping layout are not stored in {{BlockManager#blocksMap}}. Instead, entire block groups are stored in {{BlockGroupManager#blockGroups}}. When a block report arrives from the DataNode, it should be processed under the block group that it belongs to. The following naming protocol is used to calculate the group of a given block:
> {code}
>  * HDFS-EC introduces a hierarchical protocol to name blocks and groups:
>  * Contiguous: {reserved block IDs | flag | block ID}
>  * Striped: {reserved block IDs | flag | block group ID | index in group}
>  *
>  * Following n bits of reserved block IDs, The (n+1)th bit in an ID
>  * distinguishes contiguous (0) and striped (1) blocks. For a striped block,
>  * bits (n+2) to (64-m) represent the ID of its block group, while the last m
>  * bits represent its index of the group. The value m is determined by the
>  * maximum number of blocks in a group (MAX_BLOCKS_IN_GROUP).
> {code}


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