Prevent temporary deadlocks when, during a scan with write operations, the
region splits
----------------------------------------------------------------------------------------
Key: HBASE-810
URL: https://issues.apache.org/jira/browse/HBASE-810
Project: Hadoop HBase
Issue Type: Bug
Affects Versions: 0.2.0
Reporter: Jean-Daniel Cryans
Priority: Minor
Fix For: 0.2.1, 0.3.0
HBASE-804 was not about the good problem, this one is. Anyone that iterates
through the results of a scanner and that rewrites data back into the row at
each iteration will hit a UnknownScannerException if a split occurs. See the
stack in the referred jira. Timeline :
Split occurs, acquires a write lock and waits for scanners to finish
The scanner in the custom code iterates and writes data until the write is
blocked by the lock
deadlock
The scanner timeouts thus the region splits but the USE will be thrown when
next() is called
Inside a Map, the task will simply be retried when the first one fails.
Elsewhere, it becomes more complicated.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
