Nick Dimiduk created HDFS-9803: ---------------------------------- Summary: Proactively refresh ShortCircuitCache entries to avoid latency spikes Key: HDFS-9803 URL: https://issues.apache.org/jira/browse/HDFS-9803 Project: Hadoop HDFS Issue Type: Improvement Reporter: Nick Dimiduk
My region server logs are flooding with messages like "SecretManager$InvalidToken: access control error while attempting to set up short-circuit access to <hdfs-file-path> ... is expired". These logs correspond with responseTooSlow WARNings from the region server. {noformat} 2016-01-19 22:10:14,432 INFO [B.defaultRpcServer.handler=4,queue=1,port=16020] shortcircuit.ShortCircuitCache: ShortCircuitCache(0x71bdc547): could not load 1074037633_BP-1145309065-XXX-1448053136416 due to InvalidToken exception. org.apache.hadoop.security.token.SecretManager$InvalidToken: access control error while attempting to set up short-circuit access to <hfile path> token with block_token_identifier (expiryDate=1453194430724, keyId=1508822027, userId=hbase, blockPoolId=BP-1145309065-XXX-1448053136416, blockId=1074037633, access modes=[READ]) is expired. at org.apache.hadoop.hdfs.BlockReaderFactory.requestFileDescriptors(BlockReaderFactory.java:591) at org.apache.hadoop.hdfs.BlockReaderFactory.createShortCircuitReplicaInfo(BlockReaderFactory.java:490) at org.apache.hadoop.hdfs.shortcircuit.ShortCircuitCache.create(ShortCircuitCache.java:782) at org.apache.hadoop.hdfs.shortcircuit.ShortCircuitCache.fetchOrCreate(ShortCircuitCache.java:716) at org.apache.hadoop.hdfs.BlockReaderFactory.getBlockReaderLocal(BlockReaderFactory.java:422) at org.apache.hadoop.hdfs.BlockReaderFactory.build(BlockReaderFactory.java:333) at org.apache.hadoop.hdfs.DFSInputStream.blockSeekTo(DFSInputStream.java:618) at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:844) at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:896) at java.io.DataInputStream.read(DataInputStream.java:149) at org.apache.hadoop.hbase.io.hfile.HFileBlock.readWithExtra(HFileBlock.java:678) at org.apache.hadoop.hbase.io.hfile.HFileBlock$AbstractFSReader.readAtOffset(HFileBlock.java:1372) at org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderImpl.readBlockDataInternal(HFileBlock.java:1591) at org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderImpl.readBlockData(HFileBlock.java:1470) at org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock(HFileReaderV2.java:437) ... {noformat} A potential solution could be to have a background thread that makes a best effort to proactively refreshes tokens in the cache before they expire, so as to minimize latency impact on the critical path. Thanks to [~cnauroth] for providing an explaination and suggesting a solution over on the [user list|http://mail-archives.apache.org/mod_mbox/hadoop-user/201601.mbox/%3CCANZa%3DGt%3Dhvuf3fyOJqf-jdpBPL_xDknKBcp7LmaC-YUm0jDUVg%40mail.gmail.com%3E]. -- This message was sent by Atlassian JIRA (v6.3.4#6332)