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  1. Hadoop Common
  2. HADOOP-16452

Increase ipc.maximum.data.length default from 64MB to 128MB

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Details

    • Improvement
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • 2.6.0
    • 3.3.0
    • ipc
    • None
    • Default ipc.maximum.data.length is now 128 MB in order to accommodate huge block reports.

    Description

      Reason for bumping the default:
      Denser DataNodes are common. It is not uncommon to find a DataNode with > 7 million blocks these days.

      With such a high number of blocks, the block report message can exceed the 64mb limit (defined by ipc.maximum.data.length). The block reports are rejected, causing missing blocks in HDFS. We had to double this configuration value in order to work around the issue.

      We are seeing an increasing number of these cases. I think it's time to revisit some of these default values as the hardware evolves.

      Attachments

        1. HADOOP-16452.001.patch
          0.9 kB
          Siyao Meng
        2. HADOOP-16452.002.patch
          2 kB
          Siyao Meng

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. HDFS-11313 Segmented Block Reports

          • Major - Major loss of function.
          • Open

          Improvement - An improvement or enhancement to an existing feature or task. HDFS-14657 Refine NameSystem lock usage during processing FBR

          • Major - Major loss of function.
          • Patch Available

          Activity

            People

              smeng Siyao Meng
              weichiu Wei-Chiu Chuang
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              Dates

                Created:
                Updated:
                Resolved: