Mike Percy created KUDU-2124:
--------------------------------
Summary: 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}
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
