public Builder setPartKey(
          int index, java.lang.String value) {
        if (value == null) { throw new NullPointerException(); }
        ensurePartKeyIsMutable();
        partKey_.set(index, value);
        bitField0_ |= 0x00000002;
        onChanged();
        return this;
      }
<code>repeated string part_key = 2;</code>
@param index The index to set the value at.
@param value The partKey to set.
@return This builder for chaining.
llap-common/src/gen/protobuf/gen-java/org/apache/hadoop/hive/llap/daemon/rpc/LlapDaemonProtocolProtos.java