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https://issues.apache.org/jira/browse/METRON-1378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16316895#comment-16316895
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ASF GitHub Bot commented on METRON-1378:
----------------------------------------
Github user cestella commented on a diff in the pull request:
https://github.com/apache/metron/pull/879#discussion_r160239950
--- Diff:
metron-platform/metron-data-management/src/main/java/org/apache/metron/dataloads/nonbulk/flatfile/writer/Writer.java
---
@@ -0,0 +1,34 @@
+/**
+ * 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.
+ */
+package org.apache.metron.dataloads.nonbulk.flatfile.writer;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.metron.common.utils.SerDeUtils;
+
+import java.io.IOException;
+import java.util.Optional;
+
+public interface Writer {
+ void validate(Optional<String> output, Configuration hadoopConfig);
--- End diff --
good catch.
> Create a summarizer
> -------------------
>
> Key: METRON-1378
> URL: https://issues.apache.org/jira/browse/METRON-1378
> Project: Metron
> Issue Type: Improvement
> Reporter: Casey Stella
>
> We have a nice and generalized infrastructure for loading data into HBase and
> interacting with it via `flatfile_loader.sh` and `ENRICHMENT_GET()`. It is
> also useful to summarize a set of data into a static data structure, store it
> on HDFS and interact with it via stellar. To this end, to complement the
> `flatfile_loader.sh`, we should have a `flatfile_summarizer.sh` that, using
> the same extractor config, will process a flat file and output a serialized
> object.
> The usecase for this is as follows:
> Let's say that I have a static list of domains in the second column of a CSV,
> domains.csv, and I want to generate a bloom filter with those domains in them
> sans TLD.
> I should be able to create a file called `bloom.ser` with the serialized
> bloom filter given the extractor config:
> {code}
> {
> "config" : {
> "columns" : {
> "rank" : 0,
> "domain" : 1
> },
> "value_transform" : {
> "domain" : "DOMAIN_REMOVE_TLD(domain)"
> },
> "value_filter" : "LENGTH(domain) > 0",
> "state_init" : "BLOOM_INIT()",
> "state_update" : {
> "state" : "BLOOM_ADD(state, domain)"
> },
> "state_merge" : "BLOOM_MERGE(states)",
> "separator" : ","
> },
> "extractor" : "CSV"
> }
> {code}
> Note, the associated stellar function `OBJECT_GET` is pending.
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