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From "zhouyingchao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7868) Use proper blocksize to choose target for blocks
Date Fri, 06 Mar 2015 01:27:38 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

zhouyingchao updated HDFS-7868:
-------------------------------
    Attachment: HDFS-7868-004.patch

> 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: zhouyingchao
>         Attachments: HDFS-7868-001.patch, HDFS-7868-002.patch, HDFS-7868-003.patch, HDFS-7868-004.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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