Marco Massenzio created MESOS-3287:
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Summary: downloadWithHadoop tries to access Error() for a valid
Try<bool>
Key: MESOS-3287
URL: https://issues.apache.org/jira/browse/MESOS-3287
Project: Mesos
Issue Type: Bug
Reporter: Marco Massenzio
Assignee: Marco Massenzio
This was reported while trying to install Hadoop / Mesos integration:
{noformat}
I0818 05:36:35.058688 24428 fetcher.cpp:409] Fetcher Info:
{"cache_directory":"\/tmp\/mesos\/fetch\/slaves\/20150706-075218-1611773194-5050-28439-S473\/hadoop","items":[{"action":"BYPASS_CACHE","uri":{"extract":true,"value":"hdfs:\/\/hdfs.prod:54310\/user\/ashwanth\/hadoop-with-mesos-2.6.0-cdh5.4.4.tar.gz"}}],"sandbox_directory":"\/var\/lib\/mesos\/slaves\/20150706-075218-1611773194-5050-28439-S473\/frameworks\/20150706-075218-1611773194-5050-28439-4532\/executors\/executor_Task_Tracker_4129\/runs\/c26f52d4-4055-46fa-b999-11d73f2096dd","user":"hadoop"}
I0818 05:36:35.059806 24428 fetcher.cpp:364] Fetching URI
'hdfs://hdfs.prod:54310/user/ashwanth/hadoop-with-mesos-2.6.0-cdh5.4.4.tar.gz'
I0818 05:36:35.059821 24428 fetcher.cpp:238] Fetching directly into the sandbox
directory
I0818 05:36:35.059835 24428 fetcher.cpp:176] Fetching URI
'hdfs://hdfs.prod:54310/user/ashwanth/hadoop-with-mesos-2.6.0-cdh5.4.4.tar.gz'
mesos-fetcher:
/tmp/mesos-build/mesos-repo/3rdparty/libprocess/3rdparty/stout/include/stout/try.hpp:90:
const string& Try<T>::error() const [with T = bool; std::string =
std::basic_string<char>]: Assertion `data.isNone()' failed.
{noformat}
This is, however, a genuine bug in {{src/launcher/fetcher.cpp#L99}}:
{code}
Try<bool> available = hdfs.available();
if (available.isError() || !available.get()) {
return Error("Skipping fetch with Hadoop Client as"
" Hadoop Client not available: " + available.error());
}
{code}
The root cause is that (probably) the HDFS client is not available on the
slave; however, we do not {{error()}} but rather return a {{false}} result.
The bug is exposed in the {{return}} line, where we try to retrieve
{{available.error()}} (which is not there - it's just `false`).
This was a 'latent' bug that has been exposed by (my) recent refactoring of
{{os::shell}} which is used by {{hdfs.available()}} under the covers.
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