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https://issues.apache.org/jira/browse/HIVE-10081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14389929#comment-14389929
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Lefty Leverenz commented on HIVE-10081:
---------------------------------------
This adds *hive.llap.io.threadpool.size* to HiveConf.java, so I'm linking it to
HIVE-9850 (documentation for llap).
> LLAP: Make the low-level IO threadpool configurable
> ---------------------------------------------------
>
> Key: HIVE-10081
> URL: https://issues.apache.org/jira/browse/HIVE-10081
> Project: Hive
> Issue Type: Sub-task
> Reporter: Gopal V
> Assignee: Prasanth Jayachandran
> Attachments: HIVE-10081.1.patch
>
>
> The LLAP low level reader thread-pool is hard-limited to 10-threads, which is
> not sufficient to max out the network bandwidth on a 10GigE network.
> These threads are often seen in IOWAIT, since they are reading remote data.
> A dumb fix for my 12-core instance was to use a higher thread-pool count for
> the IO read-ahead.
> {code}
> diff --git
> a/llap-server/src/java/org/apache/hadoop/hive/llap/io/api/impl/LlapIoImpl.java
>
> b/llap-server/src/java/org/apache/hadoop/hive/llap/io/api/impl/LlapIoImpl.java
> index 3f9ddfb..b7cd177 100644
> ---
> a/llap-server/src/java/org/apache/hadoop/hive/llap/io/api/impl/LlapIoImpl.java
> +++
> b/llap-server/src/java/org/apache/hadoop/hive/llap/io/api/impl/LlapIoImpl.java
> @@ -105,7 +105,7 @@ private LlapIoImpl(Configuration conf) throws IOException
> {
> cachePolicy.setEvictionListener(metadataCache);
> }
> // Arbitrary thread pool. Listening is used for unhandled errors for now
> (TODO: remove?)
> - executor =
> MoreExecutors.listeningDecorator(Executors.newFixedThreadPool(10));
> + executor =
> MoreExecutors.listeningDecorator(Executors.newFixedThreadPool(24));
> {code}
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