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https://issues.apache.org/jira/browse/TAJO-525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13876113#comment-13876113
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Min Zhou edited comment on TAJO-525 at 1/20/14 3:11 AM:
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It's terrible each execution block creates a new AsyncRpcClient, which creates
a number of threads for each execution block.
By default, netty create 1 boss thread and cores*2 io worker thread. In my case
each execution block caused creating at most 1 + 24 * 2 = 49 threads!
was (Author: coderplay):
It's terrible each execution block creates a new AsyncRpcClient, which creates
a number of threads for each execution block.
By default, netty create 1 boss thread and cores*2 io worker thread. In my case
each execution block create at most 1 + 24 * 2 = 49 threads!
> Concurrent queries hang
> -----------------------
>
> Key: TAJO-525
> URL: https://issues.apache.org/jira/browse/TAJO-525
> Project: Tajo
> Issue Type: Bug
> Affects Versions: 0.8-incubating
> Reporter: Min Zhou
> Priority: Critical
> Fix For: 0.8-incubating
>
> Attachments: pstack
>
>
> When I run a simple query "select count(1) from lineitem;" in one tsql
> session and after that run the 2nd query in another tsql session. The 2nd
> one hung.
> After the 1st one done, the 2nd one still stuck at 0%.
> After that, run the same query in the first tsql session, the 3rd query also
> hung.
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