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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7358) Clients may get stuck waiting when using ByteArrayManager
Date Fri, 07 Nov 2014 20:47:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14202635#comment-14202635
] 

Tsz Wo Nicholas Sze commented on HDFS-7358:
-------------------------------------------

[~stack], have you changed dfs.bytes-per-checksum in your test?  What is version of Hadoop?
{code}
2014-11-04 16:55:57,202 DEBUG [sync.0] util.ByteArrayManager: allocate(65565): count=60367,
aboveThreshold, [131072: 9998/10000, free=1], recycled? true
{code}
I wonder why it allocates a 65565 (> 64kB) array.  See also HDFS-7308.

> Clients may get stuck waiting when using ByteArrayManager
> ---------------------------------------------------------
>
>                 Key: HDFS-7358
>                 URL: https://issues.apache.org/jira/browse/HDFS-7358
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: h7358_20141104.patch, h7358_20141104_wait_timeout.patch, h7358_20141105.patch,
h7358_20141106.patch, h7358_20141107.patch
>
>
> [~stack] reported that clients might get stuck waiting when using ByteArrayManager; see
[his comments|https://issues.apache.org/jira/browse/HDFS-7276?focusedCommentId=14197036&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14197036].



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