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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