[jira] [Created] (CASSANDRA-6156) Poor resilience and recovery for bootstrapping node - unable to fetch range
Alyssa Kwan created CASSANDRA-6156: -- Summary: Poor resilience and recovery for bootstrapping node - unable to fetch range Key: CASSANDRA-6156 URL: https://issues.apache.org/jira/browse/CASSANDRA-6156 Project: Cassandra Issue Type: Bug Components: Core Reporter: Alyssa Kwan Fix For: 1.2.8 We have an 8 node cluster on 1.2.8 using vnodes. One of our nodes failed and we are having lots of trouble bootstrapping it back. On each attempt, bootstrapping eventually fails with a RuntimeException Unable to fetch range. As far as we can tell, long GC pauses on the sender side cause heartbeat drops or delays, which leads the gossip controller to convict the connection and mark the sender dead. We've done significant GC tuning to minimize the duration of pauses and raised phi_convict to its max. It merely lets the bootstrap process take longer to fail. The inability to reliably add nodes significantly affects our ability to scale. We're not the only ones: http://stackoverflow.com/questions/19199349/cassandra-bootstrap-fails-with-unable-to-fetch-range What can we do in the immediate term to bring this node in? And what's the long term solution? One possible solution would be to allow bootstrapping to be an incremental process with individual transfers of vnode ownership instead of attempting to transfer the whole set of vnodes transactionally. (I assume that's what's happening now.) I don't know what would have to change on the gossip and token-aware client side to support this. Another solution would be to partition sstable files by vnode and allow transfer of those files directly with some sort of checkpointing of and incremental transfer of writes after the sstable is transferred. -- This message was sent by Atlassian JIRA (v6.1#6144)
[jira] [Created] (CASSANDRA-5977) Structure for cfstats output (JSON, YAML, or XML)
Alyssa Kwan created CASSANDRA-5977: -- Summary: Structure for cfstats output (JSON, YAML, or XML) Key: CASSANDRA-5977 URL: https://issues.apache.org/jira/browse/CASSANDRA-5977 Project: Cassandra Issue Type: Improvement Components: Tools Reporter: Alyssa Kwan Priority: Minor nodetool cfstats should take a --format arg that structures the output in JSON, YAML, or XML. This would be useful for piping into another script that can easily parse this and act on it. It would also help those of us who use things like MCollective gather aggregate stats across clusters/nodes. Thoughts? I can submit a patch. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira
