[ https://issues.apache.org/jira/browse/IMPALA-6816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tim Armstrong updated IMPALA-6816: ---------------------------------- Target Version: Product Backlog > Statestore spends a lot of time in GetMinSubscriberTopicVersion() > ----------------------------------------------------------------- > > Key: IMPALA-6816 > URL: https://issues.apache.org/jira/browse/IMPALA-6816 > Project: IMPALA > Issue Type: Bug > Components: Distributed Exec > Affects Versions: Impala 3.0, Impala 2.12.0 > Reporter: Tim Armstrong > Assignee: Tim Armstrong > Priority: Minor > Labels: admission-control, statestore > > {noformat} > Samples: 13K of event 'cycles', Event count (approx.): 1200870513 > 20.23% statestored impalad [.] > impala::Statestore::GetMinSubscriberTopicVersion(std::string const&, > std::string*) > 7.68% statestored [kernel.kallsyms] [k] find_busiest_group > 3.46% statestored impalad [.] > impala::Statestore::Subscriber::LastTopicVersionProcessed(std::string const&) > const > 3.26% statestored libc-2.12.so [.] __memcmp_sse4_1 > 1.41% statestored [kernel.kallsyms] [k] find_next_bit > 1.40% statestored [kernel.kallsyms] [k] cpumask_next_and > 1.21% statestored libpthread-2.12.so [.] pthread_mutex_lock > 1.04% statestored libc-2.12.so [.] memcpy > 1.01% statestored [kernel.kallsyms] [k] _spin_lock > 0.98% statestored impalad [.] 0x000000000088f903 > 0.93% statestored impalad [.] 0x000000000088f8f5 > 0.91% statestored impalad [.] 0x000000000088f8ea > 0.85% statestored [kernel.kallsyms] [k] ixgbe_xmit_frame_ring > 0.77% statestored impalad [.] 0x000000000088f8e3 > 0.75% statestored impalad [.] 0x000000000088f900 > 0.75% statestored impalad [.] > impala::Statestore::IsPrioritizedTopic(std::string const&) > 0.73% statestored impalad [.] 0x000000000088f8fa > 0.72% statestored impalad [.] operator new[](unsigned > long) > 0.68% statestored [kernel.kallsyms] [k] tcp_recvmsg > 0.67% statestored impalad [.] 0x000000000088f8fd > 0.66% statestored impalad [.] > impala::Statestore::Topic::BuildDelta(std::string const&, long, > impala::TTopicDelta*) > 0.61% statestored [kernel.kallsyms] [k] thread_return > 0.60% statestored impalad [.] 0x000000000088f8f2 > 0.60% statestored libstdc++.so.6 [.] > std::string::compare(std::string const&) const > 0.59% statestored impalad [.] 0x000000000088f8e6 > 0.56% statestored impalad [.] 0x000000000088f8ee > 0.56% statestored libcrypto.so.1.0.1e [.] aesni_encrypt > 0.55% statestored impalad [.] 0x000000000088f8e0 > 0.55% statestored [kernel.kallsyms] [k] tcp_transmit_skb > 0.53% statestored [kernel.kallsyms] [k] fget_light > 0.51% statestored impalad [.] std::_Rb_tree<void*, > std::pair<void* const, std::shared_ptr<impala::ThriftClientImpl> >, > std::_Select1st<std::pair<void* const, std::shared_ptr<impala::ThriftCl > 0.50% statestored impalad [.] > apache::thrift::transport::TVirtualTransport<apache::thrift::transport::TBufferedTransport, > apache::thrift::transport::TBufferBase>::readAll_virt(unsigned char* > 0.50% statestored impalad [.] > impala::Statestore::DoSubscriberUpdate(impala::Statestore::UpdateKind, int, > impala::Statestore::ScheduledSubscriberUpdate const&) > 0.49% statestored libssl.so.1.0.1e [.] tls1_enc > 0.48% statestored libssl.so.1.0.1e [.] ssl3_read_bytes > {noformat} > We are spending most of our time computing this for non-catalog topics, where > it's not even used. > There are a couple of ways we could fix this that I can think of: > * Avoid including this information for topics where we're not interested in it > * Cache or precompute the value somehow to avoid iterating over all > subscribers every time -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-all-unsubscr...@impala.apache.org For additional commands, e-mail: issues-all-h...@impala.apache.org