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https://issues.apache.org/jira/browse/TRAFODION-2637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16063982#comment-16063982
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ASF GitHub Bot commented on TRAFODION-2637:
-------------------------------------------
Github user zellerh commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/1141#discussion_r124147276
--- Diff:
core/sql/lib_mgmt/src/main/java/org/trafodion/libmgmt/SyncLibUDF.java ---
@@ -0,0 +1,170 @@
+/**
+* @@@ START COPYRIGHT @@@
+*
+* Licensed to the Apache Software Foundation (ASF) under one
+* or more contributor license agreements. See the NOTICE file
+* distributed with this work for additional information
+* regarding copyright ownership. The ASF licenses this file
+* to you under the Apache License, Version 2.0 (the
+* "License"); you may not use this file except in compliance
+* with the License. You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing,
+* software distributed under the License is distributed on an
+* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+* KIND, either express or implied. See the License for the
+* specific language governing permissions and limitations
+* under the License.
+*
+* @@@ END COPYRIGHT @@@
+ */
+package org.trafodion.libmgmt;
+
+import java.io.File;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+
+import org.trafodion.sql.udr.UDR;
+import org.trafodion.sql.udr.UDRInvocationInfo;
+import org.trafodion.sql.udr.UDRPlanInfo;
+import org.trafodion.sql.udr.UDRException;
+
+public class SyncLibUDF extends UDR {
+
+ // default constructor
+ public SyncLibUDF()
+ {}
+
+ @Override
+ public void describeParamsAndColumns(UDRInvocationInfo info)
+ throws UDRException
+ {
+ // this TMUDF takes no table-valued inputs, two string
+ // parameters, and generates a table with a single integer
+ // value. It assumes that it was created with the following
+ // DDL, without specifying parameters or return values:
+ //
+ // create table_mapping function SyncLibUDF()
+ // external name 'org.trafodion.libmgmt.SyncLibUDF'
+ // library ...;
+ //
+ // The call is like this: select ... from
udf(synclibudf(<op>,<file>))
+ //
+ // <op> is 'c' to create/copy a file from the HDFS staging area for
+ // the current user into a local file on every node, or
+ // 'd' to delete/drop a local file on every node
+ // <file> is an unqualified file name (no '/' in the name)
+ //
+ // Example:
+ //
+ // select * from udf("_LIBMGR_".synclibudf('c', 'mylib.jar'));
+ //
+ // INSTANCE_NUM
+ // ------------
+ //
+ // 0
+ // 1
+ //
+ // --- 2 row(s) selected.
+ // >>
+
+
+ if (info.par().getNumColumns() != 2)
+ throw new UDRException(38970, "This UDF needs to be called
with two input parameters");
+ if (info.getNumTableInputs() > 0)
+ throw new UDRException(38971, "This UDF needs to be called
without table-valued inputs");
+
+ for (int i=0; i<2; i++)
+ info.addFormalParameter(info.par().getColumn(i));
+ info.out().addIntColumn("INSTANCE_NUM", false);
+ }
+
+ @Override
+ public void describeDesiredDegreeOfParallelism(UDRInvocationInfo info,
+ UDRPlanInfo plan)
+ throws UDRException
+ {
+ boolean usesVirtualNodes = false;
+
+ // check for configurations with virtual nodes. Run the UDF
serially
+ // in those cases, since all the virtual nodes share the same node.
--- End diff --
This particular code was added for the event log reader. For these types of
maintenance UDFs, we want to run exactly one instance per physical node. The
event log reader used to return all the events twice before I added this code.
I don't think we need to adjust the DoP for regular queries. As far as I know
we don't support virtual nodes for production.
> Library management in the absence of password-less ssh
> ------------------------------------------------------
>
> Key: TRAFODION-2637
> URL: https://issues.apache.org/jira/browse/TRAFODION-2637
> Project: Apache Trafodion
> Issue Type: Bug
> Components: sql-general
> Affects Versions: 2.1-incubating
> Reporter: Hans Zeller
> Assignee: Hans Zeller
> Fix For: 2.2-incubating
>
>
> We have a set of built-in stored procedures that can be used to deploy
> libraries for UDRs to a Trafodion cluster. Some of these stored procedures
> rely on the pdsh command, which in turn relies on password-less ssh between
> the nodes of a cluster. Some installations, however, don't support
> password-less ssh. We therefore need to find another method to distribute the
> files.
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