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From "Federico D'Ambrosio" <fedex...@gmail.com>
Subject Re: Non-local session path expected to be non-null trying to write on Hive using storm-hive
Date Tue, 11 Jul 2017 09:09:21 GMT
Hi, thank you, it turns out that the jar versions I was using in sbt
assembly were indeed the real culprits!
Since I'm using HDP 2.5 all the libraries have an additional package
versioning "-157", while I was using the normal packages someone can find
on maven central. Since in the official release jar repo of Hortonworks (
http://repo.hortonworks.com/content/repositories/releases/) there are no
-157 packages, I had to use as repo this one:
http://nexus-private.hortonworks.com/nexus/content/groups/public/ (slow as
hell, but anyway working). I actually did not think that the difference in
packaging, even within the same version) could have ever been the cause of
such issues.

2017-07-10 21:52 GMT+02:00 Eugene Koifman <ekoifman@hortonworks.com>:

> Sorry, I don’t have anything specific.
>
> Hive Streaming API which Storm uses does support creating partitions on
> demand – I was just hoping to eliminate an extra step temporarily.
>
> Storm topology builds an uber jar that bundles a bunch of Hive classes in
> it.  Perhaps it’s pulling in some “other” version of Hive which causes some
> conflict…
>
>
>
>
>
> *From: *Federico D'Ambrosio <fedexist@gmail.com>
> *Reply-To: *"user@hive.apache.org" <user@hive.apache.org>
> *Date: *Monday, July 10, 2017 at 12:31 PM
> *To: *"user@hive.apache.org" <user@hive.apache.org>
> *Subject: *Re: Non-local session path expected to be non-null trying to
> write on Hive using storm-hive
>
>
>
> Thanks for your reply! Your comment made me realize that the table I was
> trying to write onto didn't have any partition, while I was trying to write
> in a specific partition:
>
> val mapper: DelimitedRecordHiveMapper = new DelimitedRecordHiveMapper().withColumnFields(new
> Fields(colNames)).withTimeAsPartitionField("YYYY/MM/DD")
>
> could that be the problem?
>
> Anyway, I tried to comment out the withTimeAsPartionField and I am now
> getting a totally different error, which could really be the actual issue
> (as an attachment the complete stacktrace):
>
> java.io.IOException: No FileSystem for scheme: hdfs
>
> which makes me think I am bundling the wrong HDFS jar in the jar
> application I'm building. Still, the version being bundled is hdfs 2.6.1,
> while the version on the cluster is 2.7.3.2.5.5.0-157 (using HDP 2.5) which
> shouldn't they be compatible?
>
> Any suggestion?
>
>
>
>
>
> 2017-07-10 20:02 GMT+02:00 Eugene Koifman <ekoifman@hortonworks.com>:
>
> Are you able to write to Hive to an existing partition?  (The stack trace
> shows that it’s being created)
>
>
>
>
>
> *From: *Federico D'Ambrosio <fedexist@gmail.com>
> *Reply-To: *"dev@hive.apache.org" <dev@hive.apache.org>
> *Date: *Monday, July 10, 2017 at 7:38 AM
> *To: *"user@hive.apache.org" <user@hive.apache.org>, "dev@hive.apache.org"
> <dev@hive.apache.org>
> *Subject: *Non-local session path expected to be non-null trying to write
> on Hive using storm-hive
>
>
>
> Greetings,
>
> I'mtrying to get a working dataflow stack on a 6 node cluster (2 masters +
> 4 slaves, no Kerberos) using Kafka (2.10_0.10), Storm (1.0.1) and Hive2
> (1.2.1). Storm is able to communicate with Kafka, but can't seemingly
> operate on Hive (on master-1), even though it manages to connect to its
> metastore.
>
> I thought originally it was a problem of permissions on either HDFS or the
> local filesystem, but even though I set 777 permissions on /tmp/hive,
> there's still this issue.
>
> In core-site.xml:
>
>    - hadoop.proxyuser.hcat.group
>
> ·         hadoop.proxyuser.hcat.hosts
>
>    - hadoop.proxyuser.hdfs.groups
>    - hadoop.proxyuser.hdfs.hosts
>    - hadoop.proxyuser.hive.groups
>    - hadoop.proxyuser.hive.hosts
>    - hadoop.proxyuser.root.groups
>    - hadoop.proxyuser.root.hosts
>
> are all set to '*'.
>
> Hive2, as far as I see is correctly set to work with transactions, being
> the target table with transactional=true, stored as orc and bucketed. In
> the hive-site.xml:
>
>    - hive.compactor.worker.threads = 1
>    - hive.compactor.initiator.on = true
>    - hive.txn.manager = org.apache.hadoop.hive.ql.lockmgr.DbTxnManager
>
> I get a Nullpointer Exception, you may find the stack trace among the
> attached files.
>
> From what I can gather, the NullpointerException is thrown in the
> following method inside SessionState:
>
> 1.  public static Path getHDFSSessionPath(Configuration conf) {
>
> 2.    SessionState ss = SessionState.get();
>
> 3.    if (ss == null) {
>
> 4.           String sessionPathString = conf.get(HDFS_SESSION_PATH_KEY);
>
> 5.           Preconditions.checkNotNull(sessionPathString,  "Conf non-local session path
expected to be non-null");
>
> 6.           return new Path(sessionPathString);
>
> 7.    }
>
> 8.    Preconditions.checkNotNull(ss.hdfsSessionPath,  "Non-local session path expected
to be non-null");
>
> 9.    return ss.hdfsSessionPath;
>
> 10.}
>
>
>
> Specifically, by:
>
> 1.  Preconditions.checkNotNull(ss.hdfsSessionPath, "Non-local session path expected to
be non-null");
>
> So, it seems to be an hdfs related issue, but I can't understand why it's
> happening.
>
> From what I gather, this occurs when Hive tries to retrieve the local path
> of the session, which is stored in the _hive.local.session.path
> configuration variable. The value of this variable is assigned each time a
> new Hive session is created, and it is formed by merging the path for user
> temporary files (hive.exec.local.scratchdir) to the session ID (
> hive.session.id).
>
> If indeed is a permissions issue, what should I look into to find the
> origin of the issue?
>
> Thanks for your help,
>
> Federico
>
>
>
>
> --
>
> Federico D'Ambrosio
>



-- 
Federico D'Ambrosio

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