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https://issues.apache.org/jira/browse/HDFS-7055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14153070#comment-14153070
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Masatake Iwasaki commented on HDFS-7055:
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Setting hadoop.trace.sampler=ProbabilitySampler did not reduce the number of
spans above because Trace#startSpan always start span without regarding to
sampler when there is ongoing trace.
{code}
public static TraceScope startSpan(String description, Sampler<TraceInfo> s,
TraceInfo tinfo) {
Span span = null;
if (isTracing() || s.next(tinfo)) {
span = new MilliSpan(description, tinfo.traceId, tinfo.spanId,
...
{code}
I would like guard for this situation.
> Add tracing to DFSInputStream
> -----------------------------
>
> Key: HDFS-7055
> URL: https://issues.apache.org/jira/browse/HDFS-7055
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, namenode
> Affects Versions: 2.6.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-7055.002.patch, HDFS-7055.003.patch,
> HDFS-7055.004.patch, screenshot-get-1mb.png
>
>
> Add tracing to DFSInputStream.
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