Hi All We use HBase 0.96.1.1, and find a very strange issue which looks like CompactSplitThread is waiting for something! The following logs are from problematic RegionServer:
2015-07-29 10:15:39,702 INFO org.apache.hadoop.hbase.regionserver.CompactSplitThread: Completed compaction: Request = regionName=realtime_rec,901943112,1426251108696.3a3c8d1c888f98518ce42f94b4033a39., storeName=usr, fileCount=3, fileSize=2.4 M, priority=12, time=21663559757818028; duration=0sec 2015-07-29 19:37:38,566 INFO org.apache.hadoop.hbase.regionserver.CompactSplitThread: Aborted compaction: Request = regionName=full_user_profile,4U5BN9EUHMZXZA58NX811Q64XRBQMNZF2KH2,1406419093595.e850bec0a113f4fb6c7ed5a136bc630e., storeName=cat, fileCount=3, fileSize=55.2 M (31.6 M, 11.5 M, 12.1 M), priority=12, time=21697278778022407; duration=0sec Between 10:15 and 19:37, I didn't find any logs generated by CompactSplitThread, and we restarted HBase cluster at time of 19:37. The waiting of compaction thread made compaction queue size constantly increase, and eventually slow down HTable.get Our major and minor compaction thread are set to 1, and I guess CompactSplitThread may be blocked in selectCompaction, since the aborted compaction only spent 0 seconds! Is there any clue which can help me to find more information? Thanks Chang
