[HBASE-5362] ZK connection leak

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 0.90.3
• Component/s: mapreduce
• Release Note: https://issues.apache.org/jira/browse/HBASE-3792
• Assignee: Unassigned
• Reporter: Ionut Ignatescu
• Created: 09/Feb/12 16:19
• Updated: 12/Jun/22 20:18
• Resolved: 08/Sep/15 16:42

Description

I have an application like a scheduler that starts periodically some MR jobs that reads from one HBase table and write in more tables, changing the row key and the columns list.
I have encounted a problem with this: after each MR job, I have +1 connections open to ZK and after a period of time, I have received IOException. I saw that I am not the first that had had this problem, but I didn't see any fix. No in HBase 0.90.4, nor in HBase 0.92.
To fix this issue I wrote a custom TableInputFormat that forces to close the connection to ZK after each getSplits call.
Also, the initTableMapperJob was overwritten.
I found an open JIRA issue here: https://issues.apache.org/jira/browse/HBASE-3792

Regards,
Ionut I.