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https://issues.apache.org/jira/browse/STORM-828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14942372#comment-14942372
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ASF GitHub Bot commented on STORM-828:
--------------------------------------
Github user revans2 commented on a diff in the pull request:
https://github.com/apache/storm/pull/668#discussion_r41088474
--- Diff:
external/storm-hdfs/src/main/java/org/apache/storm/hdfs/bolt/HdfsBolt.java ---
@@ -44,6 +49,25 @@
private transient FSDataOutputStream out;
private RecordFormat format;
private long offset = 0;
+ private static String defaultSourceDir = "/tmp/source";
+ private static String defaultDestDir = "/tmp/dest";
+ private static String defaultFileExtension = ".txt";
+
+
+ public HdfsBolt() {
--- End diff --
I'm not sure a no argument constructor makes a lot of since. I think you
need to specify at a minimum the destination directory.
> HdfsBolt takes a lot of configuration, need good defaults
> ---------------------------------------------------------
>
> Key: STORM-828
> URL: https://issues.apache.org/jira/browse/STORM-828
> Project: Apache Storm
> Issue Type: Improvement
> Components: storm-hdfs
> Reporter: Robert Joseph Evans
> Assignee: Sanket Reddy
>
> The following is code from
> https://github.com/apache/storm/blob/master/external/storm-hdfs/src/test/java/org/apache/storm/hdfs/bolt/HdfsFileTopology.java
> representing the amount of configuration required to use the HdfsBolt.
> {code}
> // sync the filesystem after every 1k tuples
> SyncPolicy syncPolicy = new CountSyncPolicy(1000);
> // rotate files every 1 min
> FileRotationPolicy rotationPolicy = new TimedRotationPolicy(1.0f,
> TimedRotationPolicy.TimeUnit.MINUTES);
> FileNameFormat fileNameFormat = new DefaultFileNameFormat()
> .withPath("/tmp/foo/")
> .withExtension(".txt");
> RecordFormat format = new DelimitedRecordFormat()
> .withFieldDelimiter("|");
> Yaml yaml = new Yaml();
> InputStream in = new FileInputStream(args[1]);
> Map<String, Object> yamlConf = (Map<String, Object>) yaml.load(in);
> in.close();
> config.put("hdfs.config", yamlConf);
> HdfsBolt bolt = new HdfsBolt()
> .withConfigKey("hdfs.config")
> .withFsUrl(args[0])
> .withFileNameFormat(fileNameFormat)
> .withRecordFormat(format)
> .withRotationPolicy(rotationPolicy)
> .withSyncPolicy(syncPolicy)
> .addRotationAction(new
> MoveFileAction().toDestination("/tmp/dest2/"));
> {code}
> This is way too much. If it were just an example showing all of the
> possibilities that would be OK but of the 8 lines used in the construction of
> the bolt, 5 of them are required or the bolt will blow up at run time. We
> should provide reasonable defaults for everything that can have a reasonable
> default. And required parameters should be passed in through the
> constructor, not as builder arguments. I realize we need to maintain
> backwards compatibility so we may need some new Bolt definitions.
> {code}
> HdfsTSVBolt bolt = new HdfsTSVBolt(outputDir);
> {code}
> If someone wanted to sync every 100 records instead of every 1000 we could do
> {code}
> TSVFileBolt bolt = new TSVFileBolt(outputDir).withSyncPolicy(new
> CountSyncPolicy(100))
> {code}
> I would like to see a base HdfsFileBolt that requires a record format, and an
> output directory. It would have defaults for everything else. Then we could
> have a TSVFileBolt and CSVFileBolt subclass it and ideally SequenceFileBolt
> as well.
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