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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18027) HBaseInterClusterReplicationEndpoint should respect RPC size limits when batching edits
Date Mon, 15 May 2017 18:51:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16011109#comment-16011109
] 

Andrew Purtell commented on HBASE-18027:
----------------------------------------

[~lhofhansl] and I discussed this in person. Summarizing the discussion here: Rather than
introduce a new inner loop (would result in a loop in a loop in a loop), lift the check for
RPC size limit violation up into the caller. Because the implementation of Replicator won't
change a different unit test will be necessary. There is also a TRACE level debug log line
that I want to make DEBUG and move. I will put up a new patch shortly. 


> HBaseInterClusterReplicationEndpoint should respect RPC size limits when batching edits
> ---------------------------------------------------------------------------------------
>
>                 Key: HBASE-18027
>                 URL: https://issues.apache.org/jira/browse/HBASE-18027
>             Project: HBase
>          Issue Type: Bug
>          Components: Replication
>    Affects Versions: 2.0.0, 1.4.0, 1.3.1
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>             Fix For: 2.0.0, 1.4.0, 1.3.2
>
>         Attachments: HBASE-18027-branch-1.patch, HBASE-18027-branch-1.patch, HBASE-18027.patch,
HBASE-18027.patch, HBASE-18027.patch
>
>
> In HBaseInterClusterReplicationEndpoint#replicate we try to replicate in batches. We
create N lists. N is the minimum of configured replicator threads, number of 100-waledit batches,
or number of current sinks. Every pending entry in the replication context is then placed
in order by hash of encoded region name into one of these N lists. Each of the N lists is
then sent all at once in one replication RPC. We do not test if the sum of data in each N
list will exceed RPC size limits. This code presumes each individual edit is reasonably small.
Not checking for aggregate size while assembling the lists into RPCs is an oversight and can
lead to replication failure when that assumption is violated.
> We can fix this by generating as many replication RPC calls as we need to drain a list,
keeping each RPC under limit, instead of assuming the whole list will fit in one.



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