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  1. Hadoop HDFS
  2. HDFS-11742

Improve balancer usability after HDFS-8818

          Details

          • Type: Bug
          • Status: Resolved
          • Priority: Blocker
          • Resolution: Fixed
          • Affects Version/s: None
          • Fix Version/s: 2.9.0, 2.7.4, 3.0.0-beta1, 2.8.2
          • Component/s: None
          • Labels:
            None

            Description

            We ran 2.8 balancer with HDFS-8818 on a 280-node and a 2,400-node cluster. In both cases, it would hang forever after two iterations. The two iterations were also moving things at a significantly lower rate. The hang itself is fixed by HDFS-11377, but the design limitation remains, so the balancer throughput ends up actually lower.

            Instead of reverting HDFS-8188 as originally suggested, I am making a small change to make it less error prone and more usable.

              Attachments

              1. balancer_fix.png
                28 kB
                Kihwal Lee
              2. balancer2.8.png
                23 kB
                Kihwal Lee
              3. HDFS-11742.branch-2.8.patch
                5 kB
                Kihwal Lee
              4. HDFS-11742.branch-2.patch
                5 kB
                Kihwal Lee
              5. HDFS-11742.trunk.patch
                5 kB
                Kihwal Lee
              6. HDFS-11742.v2.trunk.patch
                4 kB
                Kihwal Lee
              7. replaceBlockNumOps-8w.jpg
                89 kB
                Konstantin Shvachko

                Issue Links

                depends upon

                Bug - A problem which impairs or prevents the functions of the product. HDFS-11377 Balancer hung due to no available mover threads

                • Major - Major loss of function.
                • Resolved
                is broken by

                Sub-task - The sub-task of the issue HDFS-8818 Allow Balancer to run faster

                • Major - Major loss of function.
                • Resolved

                  Activity

                    People

                    • Assignee:
                      kihwal Kihwal Lee
                      Reporter:
                      kihwal Kihwal Lee
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                      Dates

                      • Created:
                        Updated:
                        Resolved: