[HBASE-236] NPE on failed open of region

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.2.0
• Fix Version/s: 0.2.0
• Component/s: regionserver
• Assignee: Jim Kellerman
• Reporter: Michael Stack
• Created: 17/Dec/07 20:09
• Updated: 22/Aug/08 21:13
• Resolved: 14/Apr/08 16:44

Description

From Bryan Duxbury supplied log:

   1044 2007-12-15 04:37:56,052 INFO org.apache.hadoop.hbase.HRegionServer: MSG_REGION_OPEN : spider_pages,7_202623541,1197662034823
   1045 2007-12-15 04:37:56,060 ERROR org.apache.hadoop.hbase.HRegionServer: error opening region spider_pages,7_202623541,1197662034823
   1046 java.io.EOFException
   1047     at java.io.DataInputStream.readByte(DataInputStream.java:250)
   1048     at org.apache.hadoop.hbase.HStoreFile.loadInfo(HStoreFile.java:594)
   1049     at org.apache.hadoop.hbase.HStore.<init>(HStore.java:613)
   1050     at org.apache.hadoop.hbase.HRegion.<init>(HRegion.java:287)
   1051     at org.apache.hadoop.hbase.HRegionServer.openRegion(HRegionServer.java:1182)
   1052     at org.apache.hadoop.hbase.HRegionServer$Worker.run(HRegionServer.java:1133)
   1053     at java.lang.Thread.run(Thread.java:619)
   1054 2007-12-15 04:37:56,061 FATAL org.apache.hadoop.hbase.HRegionServer: Unhandled exception                                                                                                                                                                                                                               1055 java.lang.NullPointerException
   1056     at org.apache.hadoop.hbase.HRegionServer.reportClose(HRegionServer.java:1066)
   1057     at org.apache.hadoop.hbase.HRegionServer.openRegion(HRegionServer.java:1188)
   1058     at org.apache.hadoop.hbase.HRegionServer$Worker.run(HRegionServer.java:1133)
   1059     at java.lang.Thread.run(Thread.java:619)
   1060 2007-12-15 04:37:56,061 INFO org.apache.hadoop.hbase.HRegionServer: worker thread exiting

I see same exception when we try to deploy same region on another server; the info file must be horked (Seems like something we could recover from reading through looking for highest sequence number; would be expensive but alternative is lost region).

Issue Links

• is part of: HBASE-433 region server should deleted restore log after successfull restore
• is part of: HBASE-11 [hbase] Unexpected exits corrupt DFS
• is part of: HBASE-7 [hbase] Provide a HBase checker and repair tool similar to fsck
• is part of: HBASE-61 [hbase] Create an HBase-specific MapFile implementation