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https://issues.apache.org/jira/browse/HBASE-1459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12717549#action_12717549
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Rong-En Fan commented on HBASE-1459:
------------------------------------
just saw it on latest 0.19 branch on a single-box
{code}
2009-06-08 13:31:30,832 DEBUG org.apache.hadoop.hbase.regionserver.HRegion:
Flush requested on table,,1244366951415
2009-06-08 13:31:30,937 DEBUG org.apache.hadoop.hbase.regionserver.HRegion:
Started memcache flush for region table,,1244366951415. Current region memcache
size 64.0m
[... Memcache: blahblahb: expired or in deletes, skipped ...]
2009-06-08 13:31:35,261 FATAL
org.apache.hadoop.hbase.regionserver.MemcacheFlusher: Replay of hlog required.
Forcing server shutdown
org.apache.hadoop.hbase.DroppedSnapshotException: region: table,,1244366951415
at
org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:903)
at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:796)
at
org.apache.hadoop.hbase.regionserver.MemcacheFlusher.flushRegion(MemcacheFlusher.java:265)
at
org.apache.hadoop.hbase.regionserver.MemcacheFlusher.run(MemcacheFlusher.java:148)
Caused by: java.util.ConcurrentModificationException
at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1100)
at java.util.TreeMap$EntryIterator.next(TreeMap.java:1136)
at java.util.TreeMap$EntryIterator.next(TreeMap.java:1131)
at
org.apache.hadoop.hbase.regionserver.HStore.internalFlushCache(HStore.java:678)
at org.apache.hadoop.hbase.regionserver.HStore.flushCache(HStore.java:636)
at
org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:888)
at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:796)
at
org.apache.hadoop.hbase.regionserver.MemcacheFlusher.flushRegion(MemcacheFlusher.java:265)
at
org.apache.hadoop.hbase.regionserver.MemcacheFlusher.run(MemcacheFlusher.java:148)
{code}
> CME during memcache flush forces HRS shutdown
> ---------------------------------------------
>
> Key: HBASE-1459
> URL: https://issues.apache.org/jira/browse/HBASE-1459
> Project: Hadoop HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.19.1
> Reporter: Rong-En Fan
> Fix For: 0.19.5
>
>
> I just saw this on my 0.19.1 cluster:
> 2009-05-30 03:57:19,559 FATAL
> org.apache.hadoop.hbase.regionserver.MemcacheFlusher: Replay of hlog
> required. Forcing server shutdown
> org.apache.hadoop.hbase.DroppedSnapshotException: region:
> table,rowkey,1243547152622
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:897)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:790)
> at
> org.apache.hadoop.hbase.regionserver.MemcacheFlusher.flushRegion(MemcacheFlusher.java:228)
> at
> org.apache.hadoop.hbase.regionserver.MemcacheFlusher.run(MemcacheFlusher.java:138)
> Caused by: java.util.ConcurrentModificationException
> at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1100)
> at java.util.TreeMap$EntryIterator.next(TreeMap.java:1136)
> at java.util.TreeMap$EntryIterator.next(TreeMap.java:1131)
> at
> org.apache.hadoop.hbase.regionserver.HStore.internalFlushCache(HStore.java:678)
> at org.apache.hadoop.hbase.regionserver.HStore.flushCache(HStore.java:636)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:882)
> ... 3 more
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