[jira] [Commented] (KUDU-2124) Tablet copy service holds session lock while initializing each session

["Todd Lipcon (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KUDU-2124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16197831#comment-16197831 ] 

Todd Lipcon commented on KUDU-2124:
-----------------------------------

[~mpercy] it seems this was fixed in 449b5f59c5e5c19f7e9136c5bbf76200a90f23c4. Should it be resolved?

> Tablet copy service holds session lock while initializing each session
> ----------------------------------------------------------------------
>
>                 Key: KUDU-2124
>                 URL: https://issues.apache.org/jira/browse/KUDU-2124
>             Project: Kudu
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 1.4.0
>            Reporter: Mike Percy
>            Assignee: Mike Percy
>
> TabletCopyService holds the service-wide lock while initializing each session. Under heavy load, this can cause starvation, timeouts, and failures. Dan came up with a pstack that had a bunch of threads waiting on the same mutex while the holder was doing I/O:
> {code}
> #2  0x0000000001a45d72 in kudu::fs::LogBlockManager::OpenBlock(kudu::BlockId const&, std::unique_ptr<kudu::fs::ReadableBlock, std::default_delete<kudu::fs::ReadableBlock> >*) ()
> #3  0x0000000001a33939 in kudu::FsManager::OpenBlock(kudu::BlockId const&, std::unique_ptr<kudu::fs::ReadableBlock, std::default_delete<kudu::fs::ReadableBlock> >*) ()
> #4  0x00000000008e5edf in kudu::tserver::TabletCopySourceSession::OpenBlockUnlocked(kudu::BlockId const&) ()
> #5  0x00000000008e7b46 in kudu::tserver::TabletCopySourceSession::Init() ()
> #6  0x00000000008e1165 in kudu::tserver::TabletCopyServiceImpl::BeginTabletCopySession(kudu::tserver::BeginTabletCopySessionRequestPB const*, kudu::tserver::BeginTabletCopySessionResponsePB*, kudu::rpc::RpcContext*) ()
> {code}



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