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Bug fix 3.4/re add overcommit memory 2 warning (#9643) 

* re-add overcommit_memory=2 warning

* updated CHANGELOG
This commit is contained in:
Jan 2019-08-06 14:21:37 +02:00 committed by Matthew Von-Maszewski
parent ab847839df
commit e19c478192
2 changed files with 11 additions and 0 deletions
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2
CHANGELOG
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@ -1,6 +1,8 @@
v3.4.8 (XXXX-XX-XX) v3.4.8 (XXXX-XX-XX)
------------------- -------------------
* Re-added warning for kernel setting "overcommit_memory=2" if jemalloc is also enabled.
* Significantly reduced "random" 1 second delays in some arangosearch DDL operations. * Significantly reduced "random" 1 second delays in some arangosearch DDL operations.
* Decreased unnecessary wait times for agency callbacks in case they were * Decreased unnecessary wait times for agency callbacks in case they were

9
lib/ApplicationFeatures/EnvironmentFeature.cpp
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@ -81,6 +81,15 @@ void EnvironmentFeature::prepare() {
uint64_t v = basics::StringUtils::uint64(value); uint64_t v = basics::StringUtils::uint64(value);
if (v == 2) { if (v == 2) {
#ifdef ARANGODB_HAVE_JEMALLOC
LOG_TOPIC(WARN, arangodb::Logger::MEMORY)
<< "/proc/sys/vm/overcommit_memory is set to a value of 2. this "
"setting has been found to be problematic";
LOG_TOPIC(WARN, Logger::MEMORY)
<< "execute 'sudo bash -c \"echo 0 > "
<< "/proc/sys/vm/overcommit_memory\"'";
#endif
// from https://www.kernel.org/doc/Documentation/sysctl/vm.txt: // from https://www.kernel.org/doc/Documentation/sysctl/vm.txt:
// //
// When this flag is 0, the kernel attempts to estimate the amount // When this flag is 0, the kernel attempts to estimate the amount