[jira] [Commented] (KUDU-1064) /tablets web page can block during leader elections

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

    [ https://issues.apache.org/jira/browse/KUDU-1064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15302635#comment-15302635 ] 

Todd Lipcon commented on KUDU-1064:
-----------------------------------

Just a note that this is still the case.

> /tablets web page can block during leader elections
> ---------------------------------------------------
>
>                 Key: KUDU-1064
>                 URL: https://issues.apache.org/jira/browse/KUDU-1064
>             Project: Kudu
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: Private Beta
>            Reporter: Todd Lipcon
>
> During startup of a server with a lot of tablets, I tried to load /tablets, and it took tens of seconds. Finally got a pstack, and the web handler is stuck at:
> {code}
> Thread 5 (Thread 0x7f5d0ee82700 (LWP 18625)):
> #0  0x000000000077007c in sys_futex ()
> #1  0x00000000007701bf in base::internal::SpinLockDelay(int volatile*, int, int) ()
> #2  0x00000000012b85f0 in base::SpinLock::SlowLock() ()
> #3  0x00000000008e19a2 in kudu::consensus::ReplicaState::LockForRead(kudu::unique_lock<kudu::simple_spinlock>*) const ()
> #4  0x00000000008d5db5 in kudu::consensus::RaftConsensus::CommittedConsensusState() const ()
> #5  0x00000000007225fb in kudu::tserver::TabletServerPathHandlers::HandleTabletsPage(kudu::WebCallbackRegistry::WebRequest const&, std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >*) ()
> {code}
> I believe the thread holding the lock is blocked on IO to write down votes (many threads are hung in IO right now).



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