Ashu Pachauri created HBASE-18137: ------------------------------------- Summary: Replication gets stuck for empty WALs Key: HBASE-18137 URL: https://issues.apache.org/jira/browse/HBASE-18137 Project: HBase Issue Type: Bug Components: Replication Affects Versions: 1.3.1 Reporter: Ashu Pachauri
Replication assumes that only the last WAL of a recovered queue can be empty. But, intermittent DFS issues may cause empty WALs being created (without the PWAL magic), and a roll of WAL to happen without a regionserver crash. This will cause recovered queues to have empty WALs in the middle. This cause replication to get stuck: {code} TRACE regionserver.ReplicationSource: Opening log <wal_file> WARN regionserver.ReplicationSource: <peer_cluster_id>-<recovered_queue> Got: java.io.EOFException at java.io.DataInputStream.readFully(DataInputStream.java:197) at java.io.DataInputStream.readFully(DataInputStream.java:169) at org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:1915) at org.apache.hadoop.io.SequenceFile$Reader.initialize(SequenceFile.java:1880) at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1829) at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1843) at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader$WALReader.<init>(SequenceFileLogReader.java:70) at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader.reset(SequenceFileLogReader.java:168) at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader.initReader(SequenceFileLogReader.java:177) at org.apache.hadoop.hbase.regionserver.wal.ReaderBase.init(ReaderBase.java:66) at org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:312) at org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:276) at org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:264) at org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:423) at org.apache.hadoop.hbase.replication.regionserver.ReplicationWALReaderManager.openReader(ReplicationWALReaderManager.java:70) at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource$ReplicationSourceWorkerThread.openReader(ReplicationSource.java:830) at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource$ReplicationSourceWorkerThread.run(ReplicationSource.java:572) {code} The WAL in question was completely empty but there were other WALs in the recovered queue which were newer and non-empty. -- This message was sent by Atlassian JIRA (v6.3.15#6346)