apache/hadoop · error · IOException

<pool> found without <poolName>

Error message

<pool> found without <poolName>

What it means

Error "<pool> found without <poolName>" thrown in apache/hadoop.

Source

Thrown at hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/OfflineImageReconstructor.java:1130

        } catch (IOException e) {
          throw new IOException("Only read " + actualNumDirectives +
              " cache pools out of " + expectedNumDirectives, e);
        }
        actualNumDirectives++;
        Node pool = new Node();
        loadNodeChildren(pool, "directive fields", "");
        processDirectiveXml(node);
      }
      expectTagEnd(CACHE_MANAGER_SECTION_NAME);
      recordSectionLength(SectionName.CACHE_MANAGER.name());
    }

    private void processPoolXml(Node pool) throws IOException {
      CachePoolInfoProto.Builder bld = CachePoolInfoProto.newBuilder();
      String poolName =
          pool.removeChildStr(CACHE_MANAGER_SECTION_POOL_NAME);
      if (poolName == null) {
        throw new IOException("<pool> found without <poolName>");
      }
      bld.setPoolName(poolName);
      String ownerName =
          pool.removeChildStr(CACHE_MANAGER_SECTION_OWNER_NAME);
      if (ownerName == null) {
        throw new IOException("<pool> found without <ownerName>");
      }
      bld.setOwnerName(ownerName);
      String groupName =
          pool.removeChildStr(CACHE_MANAGER_SECTION_GROUP_NAME);
      if (groupName == null) {
        throw new IOException("<pool> found without <groupName>");
      }
      bld.setGroupName(groupName);
      Integer mode = pool.removeChildInt(CACHE_MANAGER_SECTION_MODE);
      if (mode == null) {
        throw new IOException("<pool> found without <mode>");
      }

View on GitHub (pinned to 2add963021)

Solutions

1. Add the missing <poolName> element to the <pool> stanza in the fsimage XML.
2. Regenerate the fsimage XML with 'hdfs oiv' from a valid fsimage.

When it happens

Trigger: Thrown by oiv -r when a <pool> stanza in the CacheManager section lacks the mandatory <poolName> element.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/aaa344b96e60a4b6. Report an issue: GitHub.