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https://issues.apache.org/jira/browse/KUDU-3248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17718412#comment-17718412
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ASF subversion and git services commented on KUDU-3248:
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Commit 97edafcde5de684688516ab713307721c36349c3 in kudu's branch
refs/heads/master from Alexey Serbin
[ https://gitbox.apache.org/repos/asf?p=kudu.git;h=97edafcde ]
KUDU-3248 improve replica selection initialization
Since the original implementation stored the random choice for replica
selection integer in a variable that was initialized statically, the
corresponding calls to libstdc++/libc++ runtime had been issued before
the process called the main() function. That means some SSE4.2-specific
instructions might be called since libkudu_client is unconditionally
compiled with -msse4.2 flag, and there'd been no chance to call
KuduClientBuilder::Build() that would verify the required features are
present by calling CheckCPUFlags(). As a result, an attempt to run
an application linked with kudu_client library at a machine lacking
SSE4.2 support would result in a crash with SIGILL signal and a stack
trace like below:
#0 0x00007fc4b1b58162 in std::mersenne_twister_engine<...>::_M_gen_rand
at include/c++/7.5.0/bits/random.tcc:408
#1 std::mersenne_twister_engine<...>::operator()
at include/c++/7.5.0/bits/random.tcc:459
#2 0x00007fc4b1b1d65d in kudu::client::(anonymous
namespace)::InitRandomSelectionInt
at ../../../../../src/kudu/client/client-internal.cc:196
#3 0x00007fc4b1b1d6ef in __static_initialization_and_destruction_0
at ../../../../../src/kudu/client/client-internal.cc:198
#4 _GLOBAL__sub_I_client_internal.cc(void)
at ../../../../../src/kudu/client/client-internal.cc:871
This patch addresses that deficiency, so now instead of unexpectedly
crashing, the application would return an error upon at attempt to
create an instance of KuduClient object.
This is a follow-up to ccbbfb3006314f2c37f3a40bfec355db9fc90e02.
Change-Id: I11c2a29ef69a8c97c68330d261fdff64accebb0b
Reviewed-on: http://gerrit.cloudera.org:8080/19828
Reviewed-by: Abhishek Chennaka <[email protected]>
Reviewed-by: Wenzhe Zhou <[email protected]>
Tested-by: Alexey Serbin <[email protected]>
> Expose replica selection option that provides better affinity for remote scans
> ------------------------------------------------------------------------------
>
> Key: KUDU-3248
> URL: https://issues.apache.org/jira/browse/KUDU-3248
> Project: Kudu
> Issue Type: Improvement
> Components: client
> Reporter: David Rorke
> Assignee: Grant Henke
> Priority: Major
> Fix For: 1.15.0
>
>
> Kudu clients like Impala that use the CLOSEST_REPLICA selection option can
> suffer from bad tserver buffer cache warmup/locality during remote scans due
> to lack of tserver affinity as described in IMPALA-10481.
> The Kudu client should expose a replica selection option that provides better
> affinity when doing remote scans. The comments in IMPALA-10481 suggest a
> new LOCAL_OR_LEADER option that would select a local replica if one exists,
> otherwise fallback to the leader.
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