| HADOOP-5077 | JavaDoc errors in 0.18.3 | Blocker | util | Raghu Angadi | Raghu Angadi |
| HADOOP-4983 | Job counters sometimes go down as tasks run without task failures | Critical | . | Owen O'Malley | Amareshwari Sriramadasu |
| HADOOP-4971 | Block report times from datanodes could converge to same time. | Blocker | . | Raghu Angadi | Raghu Angadi |
| HADOOP-4961 | ConcurrentModificationException in lease recovery of empty files. | Blocker | . | Konstantin Shvachko | Konstantin Shvachko |
| HADOOP-4951 | Lease monitor does not own the LeaseManager lock in changing leases. | Blocker | . | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| HADOOP-4935 | Manual leaving of safe mode may lead to data lost | Major | . | Hairong Kuang | Konstantin Shvachko |
| HADOOP-4924 | Race condition in re-init of TaskTracker | Blocker | . | Devaraj Das | Devaraj Das |
| HADOOP-4919 | [HOD] Provide execute access to JT history directory path for group | Major | contrib/hod | Hemanth Yamijala | Peeyush Bishnoi |
| HADOOP-4910 | NameNode should exclude corrupt replicas when choosing excessive replicas to delete | Blocker | . | Hairong Kuang | Hairong Kuang |
| HADOOP-4904 | Deadlock while leaving safe mode. | Blocker | . | Konstantin Shvachko | Konstantin Shvachko |
| HADOOP-4840 | TestNodeCount sometimes fails with NullPointerException | Major | . | Hairong Kuang | Hairong Kuang |
| HADOOP-4822 | 0.18 cannot be compiled in Java 5. | Blocker | util | Tsz Wo Nicholas Sze | |
| HADOOP-4810 | Data lost at cluster startup time | Blocker | . | Hairong Kuang | Hairong Kuang |
| HADOOP-4806 | HDFS rename does not work correctly if src contains Java regular expression special characters | Blocker | . | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| HADOOP-4797 | RPC Server can leave a lot of direct buffers | Blocker | ipc | Raghu Angadi | Raghu Angadi |
| HADOOP-4795 | Lease monitor may get into an infinite loop | Blocker | . | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| HADOOP-4778 | Check for zero size block meta file when updating a block. | Blocker | . | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| HADOOP-4746 | Job output directory should be normalized | Blocker | . | Hairong Kuang | Hairong Kuang |
| HADOOP-4742 | Mistake delete replica in hadoop 0.18.1 | Blocker | . | Wang Xu | Wang Xu |
| HADOOP-4734 | Some lease recovery codes in 0.19 or trunk should also be committed in 0.18. | Blocker | . | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| HADOOP-4726 | documentation typos: “the the” | Minor | documentation | Tsz Wo Nicholas Sze | Edward J. Yoon |
| HADOOP-4717 | Removal of default port# in NameNode.getUri() cause a map/reduce job failed to prompt temporay output | Blocker | . | Hairong Kuang | Hairong Kuang |
| HADOOP-4714 | map tasks timing out during merge phase | Major | . | Christian Kunz | Jothi Padmanabhan |
| HADOOP-4713 | librecordio does not scale to large records | Blocker | record | Christian Kunz | Christian Kunz |
| HADOOP-4703 | DataNode.createInterDataNodeProtocolProxy should not wait for proxy forever while recovering lease | Major | . | Hairong Kuang | Tsz Wo Nicholas Sze |
| HADOOP-4702 | Failed block replication leaves an incomplete block in receiver's tmp data directory | Blocker | . | Hairong Kuang | Hairong Kuang |
| HADOOP-4679 | Datanode prints tons of log messages: Waiting for threadgroup to exit, active theads is XX | Major | . | Hairong Kuang | Hairong Kuang |
| HADOOP-4654 | remove temporary output directory of failed tasks | Major | . | Christian Kunz | Amareshwari Sriramadasu |
| HADOOP-4647 | NamenodeFsck creates a new DFSClient but never closes it | Major | . | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| HADOOP-4643 | NameNode should exclude excessive replicas when counting live replicas for a block | Major | . | Hairong Kuang | Hairong Kuang |
| HADOOP-4635 | Memory leak ? | Blocker | . | Marc-Olivier Fleury | Pete Wyckoff |
| HADOOP-4620 | Streaming mapper never completes if the mapper does not write to stdout | Major | . | Runping Qi | Ravi Gummadi |
| HADOOP-4616 | assertion makes fuse-dfs exit when reading incomplete data | Blocker | . | Marc-Olivier Fleury | Pete Wyckoff |
| HADOOP-4614 | “Too many open files” error while processing a large gzip file | Blocker | . | Abdul Qadeer | Yuri Pradkin |
| HADOOP-4613 | browseBlock.jsp does not generate “genstamp” property. | Major | . | Konstantin Shvachko | Johan Oskarsson |
| HADOOP-4610 | Always calculate mis-replicated blocks when safe-mode is turned off. | Major | . | Konstantin Shvachko | Konstantin Shvachko |
| HADOOP-4597 | Under-replicated blocks are not calculated if the name-node is forced out of safe-mode. | Blocker | . | Konstantin Shvachko | Konstantin Shvachko |
| HADOOP-4556 | Block went missing | Major | . | Robert Chansler | Hairong Kuang |
| HADOOP-4542 | Fault in TestDistributedUpgrade | Minor | test | Robert Chansler | Raghu Angadi |
| HADOOP-4499 | DFSClient should invoke checksumOk only once. | Blocker | . | Raghu Angadi | Raghu Angadi |
| HADOOP-4257 | TestLeaseRecovery2.testBlockSynchronization failing. | Blocker | test | Vinod Kumar Vavilapalli | Tsz Wo Nicholas Sze |
| HADOOP-3883 | TestFileCreation fails once in a while | Blocker | test | Lohit Vijayarenu | Tsz Wo Nicholas Sze |
| HADOOP-3121 | dfs -lsr fail with "Could not get listing " | Minor | fs | Koji Noguchi | Tsz Wo Nicholas Sze |
| HADOOP-1980 | ‘dfsadmin -safemode enter’ should prevent the namenode from leaving safemode automatically after startup | Minor | . | Koji Noguchi | Konstantin Shvachko |