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Posted to hdfs-issues@hadoop.apache.org by "Jery ma (JIRA)" <ji...@apache.org> on 2016/05/09 05:43:12 UTC
[jira] [Commented] (HDFS-9803) Proactively refresh
ShortCircuitCache entries to avoid latency spikes
[ https://issues.apache.org/jira/browse/HDFS-9803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15275973#comment-15275973 ]
Jery ma commented on HDFS-9803:
-------------------------------
I hit this problem too,
how to slove this? up to the follow 2 vaules , it can slow problem ?
dfs.client.read.shortcircuit.streams.cache.size 4096
dfs.client.read.shortcircuit.streams.cache.expiry.ms 300000
> 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].
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