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From "Josh Elser" <josh.el...@gmail.com>
Subject Re: Review Request 22658: ACCUMULO-2889: Batch metadata updates for new WALs
Date Thu, 26 Jun 2014 15:22:05 GMT

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https://reviews.apache.org/r/22658/#review46746
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core/src/main/java/org/apache/accumulo/core/client/impl/Writer.java
<https://reviews.apache.org/r/22658/#comment82305>

    We were talking about the bin->apply->retry-failures loop yesterday in IRC. I gave
the suggestion that perhaps we could reduce the re-implementation of this code by directly
using the batchwriter.
    
    This would require at least one change in the batchwriter to not start a new thread pool
(as we'd kill ourselves making short-lived threads).


- Josh Elser


On June 16, 2014, 9:59 p.m., Jonathan Park wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/22658/
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> 
> (Updated June 16, 2014, 9:59 p.m.)
> 
> 
> Review request for accumulo.
> 
> 
> Bugs: ACCUMULO-2889
>     https://issues.apache.org/jira/browse/ACCUMULO-2889
> 
> 
> Repository: accumulo
> 
> 
> Description
> -------
> 
> Added additional methods to the Writer class to handle batching. 
> 
> Potential risks are that we're now holding onto the locks for a bit longer than we used
to. All tablets present in a batch will have their logLock's locked until the batch is complete.

> 
> 
> Diffs
> -----
> 
>   core/src/main/java/org/apache/accumulo/core/client/impl/Writer.java d6762e7 
>   server/base/src/main/java/org/apache/accumulo/server/util/MetadataTableUtil.java 374017d

>   server/tserver/src/main/java/org/apache/accumulo/tserver/Tablet.java 36b2289 
>   server/tserver/src/main/java/org/apache/accumulo/tserver/TabletServer.java e2510d7

>   server/tserver/src/main/java/org/apache/accumulo/tserver/log/TabletServerLogger.java
d25ee75 
>   test/src/test/java/org/apache/accumulo/test/BatchMetadataUpdatesIT.java PRE-CREATION

> 
> Diff: https://reviews.apache.org/r/22658/diff/
> 
> 
> Testing
> -------
> 
> Added a new IT.
> 
> We insert a few entries to tablets and ensure that the relevant entries appear in the
WAL and Metadata Table.
> One test case that isn't included yet is verifying that root + metadata table entries
are entered correctly.
> 
> 
> Thanks,
> 
> Jonathan Park
> 
>


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