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Posted to hdfs-issues@hadoop.apache.org by "Lisheng Sun (JIRA)" <ji...@apache.org> on 2019/07/27 15:15:00 UTC
[jira] [Assigned] (HDFS-7868) Use proper blocksize to choose target
for blocks
[ https://issues.apache.org/jira/browse/HDFS-7868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lisheng Sun reassigned HDFS-7868:
---------------------------------
Assignee: Lisheng Sun (was: zhouyingchao)
> Use proper blocksize to choose target for blocks
> ------------------------------------------------
>
> Key: HDFS-7868
> URL: https://issues.apache.org/jira/browse/HDFS-7868
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.6.0
> Reporter: zhouyingchao
> Assignee: Lisheng Sun
> Priority: Major
> Labels: BB2015-05-TBR
> Attachments: HDFS-7868-001.patch
>
>
> In BlockPlacementPolicyDefault.java:isGoodTarget, the passed-in blockSize is used to determine if there is enough room for a new block on a data node. However, in two conditions the blockSize might not be proper for the purpose: (a) the passed in block size is just the size of the last block of a file, which might be very small (for e.g., called from BlockManager.ReplicationWork.chooseTargets). (b) A file which might be created with a smaller blocksize.
> In these conditions, the calculated scheduledSize might be smaller than the actual value, which finally might lead to following failure of writing or replication.
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