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https://issues.apache.org/jira/browse/HBASE-3721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13015035#comment-13015035
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Ted Yu commented on HBASE-3721:
-------------------------------
To achieve parallelism, we need to add new method in HConnection:
{code}
public <T> T getRegionServerWithRetries(ExecutorService pool,
List<ServerCallable<T>> callables, Object[] results)
throws IOException, RuntimeException;
{code}
Its implementation would use wrapper objects for callables which keep track of
the number of retries carried out so far.
LoadIncrementalHFiles would compose ServerCallables and pass them to the above
method.
> Speedup LoadIncrementalHFiles
> -----------------------------
>
> Key: HBASE-3721
> URL: https://issues.apache.org/jira/browse/HBASE-3721
> Project: HBase
> Issue Type: Improvement
> Components: util
> Reporter: Ted Yu
>
> From Adam Phelps:
> from the logs it looks like <1% of the hfiles we're loading have to be split.
> Looking at the code for LoadIncrementHFiles (hbase v0.90.1), I'm actually
> thinking our problem is that this code loads the hfiles sequentially. Our
> largest table has over 2500 regions and the data being loaded is fairly well
> distributed across them, so there end up being around 2500 HFiles for each
> load period. At 1-2 seconds per HFile that means the loading process is very
> time consuming.
> Currently server.bulkLoadHFile() is a blocking call.
> We can utilize ExecutorService to achieve better parallelism.
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