Hi Dear all, I have some confusion for edit log retain,
NNStorageRetentionManager.java: 1) purgeCheckpointsOlderThan() What's mean of check point here? 2)purgeOldStorage() I cannot understand the calculation of minimum txid, I think I can understand it if I know these keys indicates. DFS_NAMENODE_NUM_CHECKPOINTS_RETAINED_KEY DFS_NAMENODE_NUM_EXTRA_EDITS_RETAINED_KEY DFS_NAMENODE_MAX_EXTRA_EDITS_SEGMENTS_RETAINED_KEY Can any developer give me a short detail explanation? Thanks much.
