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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4393) Implement a canary monitoring program
Date Mon, 02 Apr 2012 19:29:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13244491#comment-13244491

stack commented on HBASE-4393:

Please format your contrib as a patch (git or svn add then do a git diff --no-prefix or svn
diff).  Thanks.

This line is not necessary any more:

 * Copyright 2012 The Apache Software Foundation

Please fix this doc: ' * HBase Canary Tool, that that can be used to do'  (too many 'that's)

On the Sink interface, its not going to be used by anyone else if its private?  That might
be fine for first checkin.  Later when other Sinks we can open it up?

I think filesink is the wrong sink to do as first implementation.  Your first Sink should
be StdOutSink using Logging system.  Notice how anything that is started with bin/hbase-daemon.sh
gets log files set up for it (master, regionserver, but also rest, thrift, etc.).  Doing this,
your emissions will be in a well-known place in files that are named with a format that matches
other loggings made by hbase, etc.

This method is oddly named:

 public void publish(HRegionInfo region, HColumnDescriptor column, long msTime) {

It seems like its for logging messages like this: "%s read from region %s column family %s
in %dms\n",

... should method name be logReadTime?  Or publishReadTiming?

Whats the BasicParser do?  It matches what Tool does?  We don't want GnuParser?

I like this comment:

    // user has specified an interval for canary breaths

Thats cute.

Put on one line:

    if (conf == null)
      conf = HBaseConfiguration.create();

I think I should be able to run this once OR run it as a daemon.   Pass an arg if its to run
as daemon process?

Can this code use any of the utility that is in hbck?

I like the Tool improvements.

Thanks Matteo.

> Implement a canary monitoring program
> -------------------------------------
>                 Key: HBASE-4393
>                 URL: https://issues.apache.org/jira/browse/HBASE-4393
>             Project: HBase
>          Issue Type: New Feature
>          Components: monitoring
>    Affects Versions: 0.92.0
>            Reporter: Todd Lipcon
>            Assignee: Matteo Bertozzi
>         Attachments: Canary-v0.java, HBaseCanary.java
> This JIRA is to implement a standalone program that can be used to do "canary monitoring"
of a running HBase cluster. This program would gather a list of the regions in the cluster,
then iterate over them doing lightweight operations (eg short scans) to provide metrics about
latency as well as alert on availability issues.

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