steveloughran commented on a change in pull request #2358:
URL: https://github.com/apache/hadoop/pull/2358#discussion_r500899509
##########
File path:
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/DefaultContainerExecutor.java
##########
@@ -566,11 +566,10 @@ public void writeLocalWrapperScript(Path launchDst, Path
pidFile,
@Override
public boolean signalContainer(ContainerSignalContext ctx)
throws IOException {
- String user = ctx.getUser();
String pid = ctx.getPid();
Signal signal = ctx.getSignal();
LOG.debug("Sending signal {} to pid {} as user {}",
Review comment:
unless the debug is guarded, same cost
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java
##########
@@ -486,12 +486,11 @@ DatanodeCommand cacheReport() throws IOException {
cmd = bpNamenode.cacheReport(bpRegistration, bpid, blockIds);
long sendTime = monotonicNow();
- long createCost = createTime - startTime;
long sendCost = sendTime - createTime;
dn.getMetrics().addCacheReport(sendCost);
if (LOG.isDebugEnabled()) {
LOG.debug("CacheReport of " + blockIds.size()
- + " block(s) took " + createCost + " msecs to generate and "
+ + " block(s) took " + (createTime - startTime) + " msecs to
generate and "
Review comment:
the cost of a subtraction is marginal. Moving that monotonicNow() would
be more significant, as if it is using the x86 `RDSTC` call, its a barrier
function which blocks all speculative execution until complete
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