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Colin Patrick McCabe updated HDFS-5366: --------------------------------------- Description: There are a few things about our HDFS-4949 recaching strategy that could be improved. * We should monitor the DN's maximum and current mlock'ed memory consumption levels, so that we don't ask the DN to do stuff it can't. * We should not try to initiate caching on stale or decomissioning DataNodes (although we should not recache things stored on such nodes until they're declared dead). * We might want to resend the {{DNA_CACHE}} or {{DNA_UNCACHE}} command a few times before giving up. Currently, we only send it once. was: There are a few things about our HDFS-4949 recaching strategy that could be improved. * We should monitor the DN's maximum and current mlock'ed memory consumption levels, so that we don't ask the DN to do stuff it can't. * We should not try to initiate caching on stale DataNodes (although we should not recache things stored on such nodes until they're declared dead). * We might want to resend the {{DNA_CACHE}} or {{DNA_UNCACHE}} command a few times before giving up. Currently, we only send it once. > recaching improvements > ---------------------- > > Key: HDFS-5366 > URL: https://issues.apache.org/jira/browse/HDFS-5366 > Project: Hadoop HDFS > Issue Type: Sub-task > Components: namenode > Affects Versions: HDFS-4949 > Reporter: Colin Patrick McCabe > Assignee: Colin Patrick McCabe > > There are a few things about our HDFS-4949 recaching strategy that could be > improved. > * We should monitor the DN's maximum and current mlock'ed memory consumption > levels, so that we don't ask the DN to do stuff it can't. > * We should not try to initiate caching on stale or decomissioning DataNodes > (although we should not recache things stored on such nodes until they're > declared dead). > * We might want to resend the {{DNA_CACHE}} or {{DNA_UNCACHE}} command a few > times before giving up. Currently, we only send it once. -- This message was sent by Atlassian JIRA (v6.1#6144)