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Date: Mon, 24 Oct 2016 05:36:58 +0000 (UTC)
From: "Duo Zhang (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-15709) Handle large edits for
 asynchronous WAL
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archived-at: Mon, 24 Oct 2016 05:37:00 -0000


    [ https://issues.apache.org/jira/browse/HBASE-15709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15601006#comment-15601006 ] 

Duo Zhang commented on HBASE-15709:
-----------------------------------

The max packet size is 16MB, but it include the checksum and header, so it should be a value less than 16MB and depends on the checksum size. I do not want to compute it so for simple a set 12MB as the limit.

> Handle large edits for asynchronous WAL
> ---------------------------------------
>
>                 Key: HBASE-15709
>                 URL: https://issues.apache.org/jira/browse/HBASE-15709
>             Project: HBase
>          Issue Type: Sub-task
>          Components: io, wal
>    Affects Versions: 2.0.0
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>            Priority: Critical
>             Fix For: 2.0.0
>
>         Attachments: HBASE-15709.patch
>
>
> First, FanOutOneBlockAsyncDFSOutput can not work if the buffered data is larger than PacketReceiver.MAX_PACKET_SIZE(16MB).
> Second, since we only allow one block here, we need to make sure we do not exceed the block size after writing a large chunk of data.


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