[HBASE-2889] Tool to look at HLogs -- parse and tail -f

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Later
• Component/s: wal
• Assignee: Michael Stack
• Reporter: Michael Stack
• Created: 29/Jul/10 03:49
• Updated: 12/Jun/22 00:01
• Resolved: 17/Jul/14 03:31

Description

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:

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.

Issue Links

• is related to: HBASE-2643 Figure how to deal with eof splitting logs
• is related to: HBASE-2055 Serialize WAL as Avro records
• relates to: HBASE-2961 Close zookeeper when done with it (HCM, Master, and RS)