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https://issues.apache.org/jira/browse/KUDU-1802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17297629#comment-17297629
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ASF subversion and git services commented on KUDU-1802:
-------------------------------------------------------
Commit 074e7e9a08d3aa392df068e23c425326161cf38b in kudu's branch
refs/heads/master from Alexey Serbin
[ https://gitbox.apache.org/repos/asf?p=kudu.git;h=074e7e9 ]
KUDU-3254 fix bug in meta-cache exposed by KUDU-1802
This patch fixes an issue resulting in a SIGABRT crash in Kudu client
when working with stale scan tokens which contain information about
tablet locations for a table (see KUDU-1802) whose range partition
was dropped. The patch also adds a test scenario reproducing the crash;
now it passes and can catch future regressions.
This patch is a follow-up to d23ee5d38ddc4317f431dd65df0c825c00cc968a.
Prior the change in src/kudu/client/meta_cache.cc was back-ported from
Kudu 1.14 as part of this fix, the scenario crashed with SIGABRT when
running with the stack trace similar to the following (this one below
was captured on macOS):
* frame #0: 0x00007fff7035833a libsystem_kernel.dylib`__pthread_kill + 10
frame #1: 0x00007fff70414e60 libsystem_pthread.dylib`pthread_kill + 430
frame #2: 0x00007fff702df808 libsystem_c.dylib`abort + 120
frame #3: 0x000000010ca1a259 libglog.0.dylib`google::logging_fail() at
logging.cc:1474:3
frame #4: 0x000000010ca19121
libglog.0.dylib`google::LogMessage::SendToLog() [inlined]
google::LogMessage::Fail() at logging.cc:1488:3
frame #5: 0x000000010ca1911b
libglog.0.dylib`google::LogMessage::SendToLog() at logging.cc:1442
frame #6: 0x000000010ca19815 libglog.0.dylib`google::LogMessage::Flush() at
logging.cc:1311:5
frame #7: 0x000000010ca1d76f
libglog.0.dylib`google::LogMessageFatal::~LogMessageFatal() at logging.cc:2023:5
frame #8: 0x000000010ca1a5f9
libglog.0.dylib`google::LogMessageFatal::~LogMessageFatal() at
logging.cc:2022:37
frame #9: 0x0000000103e365e3
libkudu_client.dylib`std::__1::map<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >,
kudu::client::internal::MetaCacheEntry,
std::__1::less<std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > >,
std::__1::allocator<std::__1::pair<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const,
kudu::client::internal::MetaCacheEntry> > >::mapped_type&
FindOrDie<std::__1::map<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >,
kudu::client::internal::MetaCacheEntry,
std::__1::less<std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > >,
std::__1::allocator<std::__1::pair<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const,
kudu::client::internal::MetaCacheEntry> > > >() at map-util.h:109:3
frame #10: 0x0000000103e34cbb
libkudu_client.dylib`kudu::client::internal::MetaCache::ProcessGetTableLocationsResponse()
at meta_cache.cc:943:23
frame #11: 0x0000000103e86166
libkudu_client.dylib`kudu::client::KuduScanToken::Data::PBIntoScanner() at
scan_token-internal.cc:192:35
frame #12: 0x0000000103e88051
libkudu_client.dylib`kudu::client::KuduScanToken::Data::DeserializeIntoScanner()
at scan_token-internal.cc:111:10
frame #13: 0x0000000103d55d3c
libkudu_client.dylib`kudu::client::KuduScanToken::DeserializeIntoScanner() at
client.cc:1879:10
Change-Id: I5b8370290c13b1e496f461ed5bc2e0193bdf4b19
Reviewed-on: http://gerrit.cloudera.org:8080/17152
Tested-by: Alexey Serbin <aser...@cloudera.com>
Reviewed-by: Andrew Wong <aw...@cloudera.com>
(cherry picked from commit 7c8dca60d15b560017ef7e726a379788727502ba)
Conflicts:
src/kudu/client/meta_cache.cc
src/kudu/client/scan_token-test.cc
Reviewed-on: http://gerrit.cloudera.org:8080/17158
Tested-by: Kudu Jenkins
Reviewed-by: Grant Henke <granthe...@apache.org>
> Deserializing scan tokens should avoid round-trip to master
> -----------------------------------------------------------
>
> Key: KUDU-1802
> URL: https://issues.apache.org/jira/browse/KUDU-1802
> Project: Kudu
> Issue Type: Improvement
> Components: client, perf
> Affects Versions: 1.2.0
> Reporter: Todd Lipcon
> Assignee: Grant Henke
> Priority: Major
> Labels: impala, ramp-up
> Fix For: 1.13.0
>
>
> Currently, KuduScanToken::DeserializeIntoScanner calls
> KuduClient::OpenTable() which makes a GetTableSchema call to the master. This
> round trip is a bit expensive because it's always a "thundering herd" for an
> Impala query or Spark job -- every host deserializes a bunch of scan tokens
> at the same time and ends up having to back off.
> We should consider some ways to avoid this.
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