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Kihwal Lee commented on HDFS-12070: ----------------------------------- bq. the PD needs to ... tell the namenode to exclude the failed node from the expected locations. It appears calling {{commitBlockSynchronization()}} with {{closeFile == false}} might do the trick. On the NN size, we could make it do block/lease recovery again soon. The older NNs will still work, but with 1 hour delay until the retry. > Failed block recovery leaves files open indefinitely and at risk for data loss > ------------------------------------------------------------------------------ > > Key: HDFS-12070 > URL: https://issues.apache.org/jira/browse/HDFS-12070 > Project: Hadoop HDFS > Issue Type: Bug > Affects Versions: 2.0.0-alpha > Reporter: Daryn Sharp > > Files will remain open indefinitely if block recovery fails which creates a > high risk of data loss. The replication monitor will not replicate these > blocks. > The NN provides the primary node a list of candidate nodes for recovery which > involves a 2-stage process. The primary node removes any candidates that > cannot init replica recovery (essentially alive and knows about the block) to > create a sync list. Stage 2 issues updates to the sync list – _but fails if > any node fails_ unlike the first stage. The NN should be informed of nodes > that did succeed. > Manual recovery will also fail until the problematic node is temporarily > stopped so a connection refused will induce the bad node to be pruned from > the candidates. Recovery succeeds, the lease is released, under replication > is fixed, and block is invalidated from the bad node. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org