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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15709) Handle large edits for asynchronous WAL
Date Tue, 25 Oct 2016 02:09:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15603908#comment-15603908
] 

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

Yeah the datanode only aceept a packet starting from a checksum boundary, so if we break at
a point which is not the checksum boundary, then we need to also include the data to the previous
checksum boundary when sending the next packet. And thanks for the remind, I think I need
to make sure the MAX_DATA_LEN is aligned with the checksum chunk size. Will upload a new patch
and commit it if the precommit result is OK.

Thanks.

> 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-v1.patch, 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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