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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10312) Large block reports may fail to decode at NameNode due to 64 MB protobuf maximum length restriction.
Date Tue, 19 Apr 2016 23:35:25 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10312?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arpit Agarwal updated HDFS-10312:
---------------------------------
    Attachment: test-delta.patch

Hi [~cnauroth], +1 for the v4 patch. Thanks for this improvement.

The attached test-delta.patch reduces the test runtime from ~30 seconds to ~3 seconds by using
a lower message size limit. What do you think?

Also (and Chris etc. know this of course!), it is far from ideal to have ~6 million blocks
on one storage directory. We should add a warning when we document this setting.

> Large block reports may fail to decode at NameNode due to 64 MB protobuf maximum length
restriction.
> ----------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-10312
>                 URL: https://issues.apache.org/jira/browse/HDFS-10312
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>         Attachments: HDFS-10312.001.patch, HDFS-10312.002.patch, HDFS-10312.003.patch,
HDFS-10312.004.patch, test-delta.patch
>
>
> Our RPC server caps the maximum size of incoming messages at 64 MB by default.  For exceptional
circumstances, this can be uptuned using {{ipc.maximum.data.length}}.  However, for block
reports, there is still an internal maximum length restriction of 64 MB enforced by protobuf.
 (Sample stack trace to follow in comments.)  This issue proposes to apply the same override
to our block list decoding, so that large block reports can proceed.



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