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From "Chris Harris (JIRA)" <j...@apache.org>
Subject [jira] Created: (SOLR-1912) Replication handler should offer more useful status messages, especially during fsync/commit/etc.
Date Fri, 14 May 2010 01:47:42 GMT
Replication handler should offer more useful status messages, especially during fsync/commit/etc.
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                 Key: SOLR-1912
                 URL: https://issues.apache.org/jira/browse/SOLR-1912
             Project: Solr
          Issue Type: Improvement
          Components: replication (java)
    Affects Versions: 1.4
            Reporter: Chris Harris
         Attachments: SOLR-1912.patch

If you go to the replication admin page (http://server:port/solr/core/admin/replication/index.jsp)
while replication is in progress, then you'll see a "Current Replication Status" section,
which indicates how far along the replication download is, both overall and for the current
file. It's great to see this status info. However, the replication admin page becomes misleading
once the last file has been downloaded. In particular, after all downloads are complete Solr
1.4 continues to display things like this:

{quote}
Downloading File: _wv_1.del, Downloaded: 44 bytes / 44 bytes [100.0%] 
{quote}

until all the index copying, fsync-ing, committing, and so on are complete. It gives the disconcerting
impression that data transfer between master and slaves has mysteriously stalled right at
the end of a 44 byte download. In case this is weird, let me mention that after a full replication
I did just now, Solr spent quite a while in SnapPuller.terminateAndWaitFsyncService(), somewhere
between many seconds and maybe 5 minutes.

I propose that the admin page should offer more useful status messages while fsync/etc. are
going on. I offer an initial patch that does this. SnapPuller is modified to always offer
a human readable indication of the "current operation", and this is displayed on the replication
page. We also stop showing progress indication for the "current file", except when there actually
is a file currently being downloaded.

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