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From "Nicolas Spiegelberg (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2889) Tool to look at HLogs -- parse and tail -f
Date Fri, 24 Sep 2010 01:50:36 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nicolas Spiegelberg updated HBASE-2889:
---------------------------------------

    Attachment: HBASE-2889_2.patch

generalized the fix on trunk, using reflection.  also added a couple variables that I've found
helpful while dealing with EOF problems.  should be able to apply this against trunk (r1000684)

> Tool to look at HLogs -- parse and tail -f
> ------------------------------------------
>
>                 Key: HBASE-2889
>                 URL: https://issues.apache.org/jira/browse/HBASE-2889
>             Project: HBase
>          Issue Type: Bug
>          Components: wal
>            Reporter: stack
>            Assignee: stack
>             Fix For: 0.90.0
>
>         Attachments: 2889.txt, HBASE-2889_2.patch
>
>
> We need a tool for looking at wals.  A tail -f would be sweet though it might be ugly
having to open each time it wants to dump next lot of edits out wal log.
> From Kannan:
> {code}20:45 <kannan> WALEdit already has a toString().
> 20:46 <kannan> And append/sync support allows you to read concurrently a file that
is being written too... (like JDs replication).
> 20:46 <kannan> So it would be good if I could do a bin/hbase hlogprint -f hdfs://...../.logs/<filename>
-v -p
> 20:46 <kannan> much like the HFile pretty printer... except the HLog one is effectively
a tail -f.
> {code}

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