[ https://issues.apache.org/jira/browse/KUDU-2124?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mike Percy reassigned KUDU-2124: -------------------------------- Assignee: Dan Burkert (was: Mike Percy) > 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: Dan Burkert > Fix For: 1.6.0 > > > 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} -- This message was sent by Atlassian JIRA (v6.4.14#64029)